224 PARASITES OF THE DOMESTIC ANIMALS 



Strong3'lus equinus. Host, equines. P. 288. 

 St. edentatus. Host, equines. P. 289. 

 St. vulgaris. Host, equines. P. 289. 

 Cylicostomuni tetracanthum. Host, equines. P. 289. 

 Ankvlostoma canina. Hosts, dog, cat. P. 291. 

 Uncinaria stenocephala. Host, dog. P. 292. 

 Bunostomum trigonocephalum. Host, ruminants. P. 293. 

 B. phlebotomum. Host, cattle. P. 293. 

 S3aigamus trachealis. Host, fowl. P. 293. 

 Sj-n. bronchialis. Host, water fowl. P. 293. 

 Family (f) Eustrongylida?. P. 296. 

 Genus and Species : 



Dioctoph\ane renale. Hosts, dog and other animals. P. 296. 

 Family (g) Trichinellidffi. P. 299. 

 Genus and Species: 



Trichuris ovis. Host, ruminants. P. 299. 

 T. crenatus. Host, hog. P. 299. 

 T. depressiusculus. Host, dog. P. 300. 

 Trichinella spiralis. Hosts, hog, rat, mouse, and other 

 mammals. P. 301. 

 Order 2. Acanthocephala. P. 306. 



Family (a) Gigantorhynchidae. P. 306. 

 Genus and Species : 



Gigantorhynchus hirudinaceus. Host, hog, man. P. 306. 

 Class B. Annelida. Annulated worms. P. 307. 

 Order 1. Hirudinea. Leeches. P. 307. 

 Family (a) Gnathobdellidse. P. 308. 

 Genus and Species : 

 Hirudo medicinalis. Medicinal leech. P. 309. 

 Hsemopis sanguisuga. Horse leech. P. 308. 



With slight omissions, the following descriptions of superfamilies 

 and their subdivisions are transcribed from a work upon the nematode 

 parasites of small mammals by Maurice C. Hall (1916). 



''Esophagus consists of a chitinous tube which is embedded along 

 the greater part of its length in a chain of single cells. The anterior 

 portion of the body, occupied by the esophagus, usually very slender; 

 the posterior portion, occupied by the intestine and reproductive 

 organs, more or less swollen, or at least thicker than the anterior portion. 

 Anus terminal or subterminal. Male with only one spicule or with no 

 spicule. One testis. Female with one ovary. Vulva situated at the 

 junction of the anterior and posterior portion of the body. Oviparous 

 or ovoviviparous. In digestive tract or adnexa or in urinary bladder 

 as adults. Life history usually simple. Larva of at least one intestinal 



