524 MOLLUSCA 



C. vancouverensis Lea. Height 14 mm.; diameter 31 mm.; color 

 yellowish: Washington, Idaho, and northwards. 



Family 10. TESTACELLIDAE. 



Shell variable in shape, animal long and slug-like; jaw absent; 

 radula with long thorn-like teeth, the animal being carnivorous; ureter 

 reflexed: about 12 genera. 



1. Testacella Cuvier. Shell very small and rudi- 

 mentary, and ear-shaped, and carried on the back near the 

 hinder end : 7 species, principally in western Mediterranean 

 countries. 



T. haliotoidea (Ferussac). Leng-th of shell 7 mm.; 

 breadth 4.5 mm.; body of animal 5 times as long: green- 

 houses in Philadelphia and other cities, where it feeds on 

 worms, snails, etc. 



2. Etjglandina Ferussac. Shell tall and conical, 

 with 6 to 8 Avhorls; tentacle-like lip on each side 

 of mouth: tropical America; 4 species in the southern 

 states. 



E. rosea Fer. {E. truncata Gmelin) (Fig. 812). Shell 37 mm. long or 

 more and 13 mm. thick, and fluted with longitudinal ridges: South Caro- 

 lina to Texas; it leads a semi-aquatic life, feeding largely on snails. 



Family 11. ZONITIDAE. 



Shell thin and delicate, usually depressed, often very small; usually 

 with umbilicus; jaw smooth or nearly so, with a median projection; 

 aperture large with a thin lip; foot with marginal grooves and caudal 

 mucous gland; ureter reflexed: cosmopolitan; 65 American species, which 

 live under dead leaves, rotting logs, and in other similar places. 



Key to the genera of Zonitidae here described: 



Oi Dart sac and mucous genital glands absent. 



&i Whorls 2 or 3 ; no umbilicus 2. Vitrina 



&a Whorls 4 or more ; usually with umbilicus. 

 Ci Spire depressed, 

 di Shell 15 mm. or more in diameter, smoky in appearance. . .1. Ompiialina 



(Zj Shell small, glassy in appearance 3. Vitrea 



c. Spire high. 4. Euconulus 



flj Dart sac and genital mucous glands present (Fig. 800). 

 6i Internal teeth or a calcareous deposit on floor of largest whorl. 



G. Gastrodonta 

 62 No internal teeth ; umbilicus wide 5. Zonitoides 



1. Omphalina Rafinesque. Shell striated above, smooth below, with 

 umbilicus; last whorl dilated; aperture broad, with an acute lip: about 

 14 species, all North American. 



