132 



UNIVALVES PATELA. 



Rosea — Rosy-rayed. 

 Scutellum — Escutcheon. 

 Avellana — Filbert. 

 Spinosa — Spinous, 

 Denticulata — Toothed-margin. 

 Nodulosa — Nodulous. 

 Angusta — Narrow-slit. 

 Inaequalis — Unequal. 

 Minuta — Small. 

 Qons^exsdi-^Sprinkled. 

 Rubescens — Reddish. 

 Sanguinea — Red. 

 Ventricosa — Fetitricose. 

 T riradiata — Triple-rayed. 

 Tenuis — Thin-amber. 

 Melanozonias — Black-zoned. 

 E ffusa — Large-slit, 



Punicea — Chesnut. 

 Rufescens — White and red. 

 Dimidiata — Divided. 

 Lactea — Milk-white. 

 Py rami dalis — Pyramidal. 

 Bicolor — Chesnut and white. 

 Erythrocephala — Red-crowned. 

 Verrucosa — Wart-ribbed. 

 Contaminata — Black-spotted. 

 Atrata — Black-dotted. 

 Candicans — White. 

 Succincta — Belted. 

 Pusilla — Small. 

 Flavescens — Yellounsh. 

 Antiquata — Antiquated. 

 Galeata — Helmet. 

 Personata — Radiated-mask. 



DENTALIUM— Tooth or Tusk-Shixl. 



Animal— a Terehella: Shell univalve^ 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 

 tjiem possess. 



