4 Melvill, Descriptions of Marine Mollnsca. 



Nassa (Niotha) mammillifera, sp. nov. (PL 6, f. 2). 



N. testa fnsifonni, spira attenuata, ad apicem acuta, 

 gracili, solidiuscida, anfractibus octo, quorum apicalibtis 

 duobus, vitreis, lavibus, ceteris apud suturas multum 

 impressis, subventricosis supemis tribus, ultimo undecim gem- 

 mularum vel mammillarum ordinibus spiralibus decorato, 

 mamillis parvis, rotundis, nitidis, valde regularibus, infra 

 suturas et ad medium idtimi anfractus obscure rufo-vittata, 

 apcrtura oblonga, labro extus paullum ejfuso, incrassato, 

 nitido, albo, intus denticidato, canali brevi, margine columel- 

 lari paullum ejfosso, dente suturali prominente. 



Long. 11, lat. 5 mm., sp. maj. 



Hab. Persian Gulf. 



Five specimens of a small Nassa, which is unlike any 

 in the National collection. It would appear near N. 

 margaritifera Dunker. The above description will show 

 its peculiarities, the very regular mammillate nodules, 

 three-rowed in the upper whorls, eleven-rowed in the 

 lowest, with much attenuation of whorl, and sharp apex. 

 The shell is obscurely banded transversely with rufous. 



Nassa (Hima) Townsendi, sp. nov. (PL 6, f. 1). 



N. testa fnsifonni, eleganter superne attenuata, sub- 

 turrita, pallide brunnea, anfractibus octo, tumidulis, ad 

 suturas impressis, longitudinaliter arete obliquicostatis, spira- 

 liter liratis, costis ad juncturis lirarum clathrato-noduliferis, 

 liris idtimi anfractus ergd basin fortioribus, ad suturas et 

 ad medium idtimi anfractus obscure rufocincta, apertura 

 subrotunda, sinu canali lato, peristomate extus incrassato, 

 intus sex crenato-dentato, dente suturali prominente. 



Long. 14, lat. 6 mm. 



Hab. Mekran Coast. 



An elegantly formed Nassa, the upper whorls becoming 

 much attenuate, somewhat tumid, impressed at the 



