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Commonly known as "Gui Luosi" (Ghost Snail), it resembles the sea snail but is smaller in size. In autumn and winter, it is often found in stone crevices at the foot of walls; in summer, it lives on green moss in wetlands. It should be collected and washed to remove soil before use.

Treatment for Jaundice: *Cihang Huoren Shu* records: Take half a bowl of snails from rocks, crush them into a paste, and take orally with hot white wine free of impurities.

Treatment for Carbuncle (*Ding*): *Jishi Liangfang* records: Huangfeng Ointment treats carbuncles and heat-toxin sores on the head and face. The formula consists of Realgar (*Xionghuang*) 1 liang, nail rust and flesh of preserved plum (*Baimei Rou*) each 5 qian, and Xiaofeng Powder 1 liang; in summer, add 20 Gui Luosi, grind all together into a fine powder, mix evenly with bitter salt brine, and store in a porcelain jar. For any patient suffering from carbuncle swelling or toxic sores, first pierce the top of the sore with a silver needle, apply this medicine, cover firmly with cotton paper to prevent the toxin from spreading; healing occurs after three days. *Huangshi Yichao* records: Crush small, slender Gui Luosi until soft, and apply including the shell to the affected area to promote pus discharge; swelling subsides the next day.

Extraction of Carbuncle Root: *Baohetang Mifang* records: Take one Gui Luosi, three lychee seeds (*Lizhi He*) processed to retain their medicinal properties, and six pieces of preserved plum flesh (*Baimei Rou*). Crush together into a paste and apply externally. After extracting the root of the carbuncle, finish treatment with Babao Dan.

Treatment for Nasal Carbuncle: *Cihang Huoren Shu* records: Take two or three green snails from flower pots, crush them with salt, and apply topically for immediate effect.

Treatment for White Fire Dan (*Bai Huodan*): *Jiting* records: There are five types of Dan poison: green, yellow, red, white, and black. Yellow and white types are easy to treat, while black type is incurable. Green type can be treated within ten days, and red type similarly. All types must avoid exposure to lamp light and salted foods. Treatment method: Boil Gui Luosi found in mountain streams in wine and consume; the condition will subside. For those with bloating and stifling sensation, consuming it several times leads to recovery.

Sanlou Pills (*Three Leaks Pills*): *Huoren Shu* records: Treats perianal fistula (*Chuan Pi Lou*), recto-vaginal/enteric fistula (*Tong Chang Lou*), and vine-like fistula (*Gua Teng Lou*). These are caused by damp-heat pathogenic toxins. This is a reliable formula for killing parasites and resolving sinus tracts. Ingredients include earth wasp nest (*Tu Fengwo*), Gui Luosi, and cicada slough (*Chantui*) each 7 qian; Frankincense (*Ruxiang*), Myrrh (*Moyao*), Rhizoma Dioscoreae Hypoleucae (*Chuan Bi Xie*) prepared with butter, aged palm fruit (*Chen Zong*), and Artemisiae Argyi Folium (*Guan Zhong*) each 5 qian; ten pig hoof claws (*Zhu Xuantiji*), one spiny cocklebur peel (*Cishi Pi*) roasted, and Polyporus Umbellatus (*Leiwan*) 3 qian. Melt 4 liang of yellow beeswax, add 6-7 spoons of sesame oil, mix with herbs, and form pills the size of paulownia seeds. Take 60-70 pills per dose with plain warm water on an empty stomach.

Unblocking Meridians: *Zhou Shi Jiabao* records: Crush 14 Gui Luosi, spread onto oiled paper, and apply to the umbilicus, binding securely for one shichen (two hours). This snail grows in yin-damp places.