524 HOLLUSCA 



C. Vancouver ensis 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). Length 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. EUGLANDINA Ferussac. Shell tall and conical, 

 6 to 8 whorls; tentacle-like lip on each side 



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: 



a x Dart sac and mucous genital glands absent. 



6j Whorls 2 or 3 ; no umbilicus 2. VITBINA 



6, Whorls 4 or more ; usually with umbilicus. 

 c x Spire depressed. 

 d^ Shell 15 mm. or more in diameter, smoky in appearance ... 1. OMPHALINA 



<f a Shell small, glassy in appearance 3. VITREA 



Cj Spire high 4. EUCONULUS 



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

 &! Internal teeth or a calcareous deposit on floor of largest whorl. 



6. GASTRODONTA 

 6, No internal teeth ; umbilicus wide 5. ZONITOIDES 



1. OMPHALINA Rafmesque. Shell striated above, smooth below, with 

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

 14 species, all North American. 



