306 DONAX. 



centric waved threads. Two specimens of this beautiful species 

 are in Mr. Taylor's collection. 



4. scalpellum (f. 9), Gray. — Testa lanceolata, corapressa, 

 obscure radiata, postice ad angulutn subcarinata, post angulutn 

 angusta, concentrice lirata, margine convexo, antice producto, 

 angustato, ad terminum elevato. — Very long and narrow, with a 

 narrow and finely striated posterior area. 



5. acutangulus (f. 10), Desk. — D.scalpetto simili sed latiore, 

 minutissime sub lente striata, area postica concava, minute lirata. 

 — Of a broader form than I), scalpellum, very minutely decussated, 

 the posterior angle concave and striated. 



6. tuansversus (f. \\), Sowb. T. C. — Testa B. scalpello simili, 

 postice magis obliqua, area radiatim striata. — Like No. 4, with 

 the posterior area more sloping and radiately striated. 



7. Owenii (f. 8), Gray. — Testa I), scalpello simili, sed area 

 postica biangulata, concentrice lirata, ad ligamentum elevata. — 

 The area is more raised towards the ligament and is radiately 

 double-angled. 



8. spinosus (f. 19), Chemn. — D. testa elongata, cuneiforme 

 laevigata, leviter prope marginein et postice radiatim striata, fulvo- 

 purpurascente, intus et ad umbonem livida, latere antico producto 

 subacuminato, latere postico truncato, angulato, angulo acuto, 

 subspinifero, area postangulari tenuissime decussata. — This little 

 cuneiform shell is remarkable for the serrated or spiniferous keel 

 which borders its post-angular area. 



9. clathratus (f. V6),Desh. — D. testa breviuscula, cuneiformi, 

 violacea, minute cancellata, latere autico subacuminato, latere 

 postico truncato biangulato ad angulum magnum subspinifero. — ■ 

 Eesembliug D. spinosa in the serrated or spiniferous character of 

 the angle, but purple, and finely cancellated throughout. 



10. semisulcatus (f. 22),IIai/l. — D. testa brevitertrigona,alba, 

 antice acuminata, polita, postice prope augulum subconcentrice 

 lirata, striis granpsis decussata, angulo acuto, serrato, subcarinato, 

 umbonibus elevatis, area postica subplanulata, granoso-striata. — 



V short elevated shell, smooth in front and ornamented at the 

 back with ridges decussated by radiating striae. I), sordida, Eve., 

 appears to be a variety of this, partly denuded of the sulci and 

 serrations. 



11. Mauagascauiensis (f. 16), Wood. — Testa brevi, acute 

 Uiangulata, camea, nonnunquam partim livida, omnino diagona- 



