132 



UNIVALVES PvVTELA. 



Rosea — Rosy-rayed. 

 Scutellum — Escutcheon. 

 Avellana — Filbert. 

 Spinosa — Spinous. 

 Denticulata — Toothed-margin. 

 Nodulosa — Nodulous. 

 Angusta — Narrow-slit. 

 Insequalis — Unequal. 

 Minuta — Small. 

 Conspersa — Sprinkled. 

 Rubescens — Reddish. 

 Sanguinea — Red. 

 Ventricosa — Ventricose. 

 Triradiata — Triple-rayed. 

 Tenuis — Thin-amher. 

 Melanozonias — Black-zoned. 

 E ffusa — Large-slit. 



Punicea — Chesnul. 

 Rufescens — TVIiite and red. 

 Dimidiata — Divided. 

 Lactea — Milk-white. 

 Pyramidalis — Pyramidal. 

 Bicolor — Chesnut and white. 

 Erythrocephala — Red-crowned. 

 Verrucosa— Wart-rihhed. 

 Contaminata — Black-spotted. 

 A trata — Black- dotted. 

 Candicans — White. 

 Succincta — Belted. 

 Pusilla — Small. 

 Flavescens — Yellowish. 

 Antiquata — Antiquated. 

 Galeata — Helmet. 

 Personata — Radiated-mask. 



DENTALIUM.— Tooth or Tusk-Shkll. 



Animal — a Terehella: Shell univalvfiy tubular, straight, 

 or slightly curved, with an undivided cavity open at 

 both ends. 



Of this singular genus there are but twenty-two species; 

 they are very similar in form, and resemble an elephant's 

 tusk in miniature. 



They differ principally in magnitude, and in the num- 

 ber of ribs and grooves with which some of the species 

 are marked; a trifling distinction may also be made 

 with regard to the degree of curvature which many of 

 them possess. 



