10 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. no. 



SiaT3f-«nily TE,ICIII]vrE:LT^I]SrA.IC Ransoin, 1911a. 



Subfamily diagnosis. — Trichiiiellidae (p, 9) : Male without spic- 

 ule. Female ovoviviparous ; the spherical egg is surrounded with a 

 delicate membrane and is without a true eggshell. Worms in the 

 intestine of the host animal. 



Type-genus. — Trlchinella Eailliet, 1895. 



Genus TRICHINELLA Railliet, 189S. 



Generic diagnosis. — Trichinellinae (p. 10) : With the 

 characters of the subfamily. 



Type-species. — Trlchinella spiralis (Owen, 1835) 

 Raiiliet, 1895. 



TRICHINELLA SPIRALIS (Owen, 1835) Railliet, 1895. 



Synonyms. — Trichina spiralis Owen, 1835 ; Trichina 

 circumflexa Polonio, 1860. 



Specific diagnosis. — Trlchinella (p. 10"): Minute 

 worms of nearly uniform diameter throughout, becom- 

 ing somewhat thicker posteriorly. The small head has 

 a round unarmed mouth which opens into a distinct 

 tubular portion of the esophagus which in turn is fol- 

 lowed by the chain of single cells characteristic of the 

 superfamily. This is stated to be half of the length of 

 the body, but is figured as quite a little more or less by 

 various authors. It consists of a thin chitinous tube of 

 triangular cross section, Avhich is embedded in a string 

 of vesicular cells, the individual cells thus surrounding 

 the tube on all sides. These cells and the esophageal 

 tube inclosed by them are surrounded by a connnon 

 membrane. The cells may perhaps 

 have the function of digestive glands. 

 At the posterioj" end of the esophagus 

 are two inconstant lateral appendages 

 which have been taken for ceca, but 

 which according to Leuckart are solid 

 cell structures. Following the esopha- 

 gus is the thin-walled intestine, flask- 

 shaped at its origin. On the inner side 

 flat cells are visible in places. The in- 

 testine terminates in the rectum, a mus- 

 cular tube lined with chitin. In 

 sexually mature males the rectum is 

 longer and its musculature thicker. The anus is terminal and in the 

 form of a cleft. 



Fig. 5.— TRICHI- 

 NELLA SPI- 

 KAHS. Male. 

 Enlarged. 

 After Leuck- 

 art, ISGG. 



Fig. 6.— TRICHINELLA 



sriRAi.is. Poste- 

 rior EXTREMITY OF 

 male, showing ex- 

 truded cloaca. 

 Enlarged. After 

 Leuckart, 1S66. 



