8 Dr. P. P. Carpenter on new Forms of Mollusks 



carinato, anfractus intus monstrante. Long. '28, long. spir. '08, 

 lat. -Spoil., div. 110°. 



25. Fossarus parcipictus. 



F. testa parva, solidiore, spira plus minnsve elevata ; albida, rufo- 

 fusco varie maculata ; carinulis spiralibus acutioribus, quarum 

 circ. vi. majores, striolisque crebris cincta ; anfr. ultimo tumidiore ; 

 labro acuto, baud intus incrassato ; umbilico satis magno, ad mar- 

 ginem carinato : operculo normali. Long. '24, long. spir. "06, 

 lat. -2 poll., div. 90°. 



The few specimens found are very variable in outline. 



26. Fossarus pur us. 



F. testa F. angvlafo simili, sed alba, subdiaphana; anfr. nucl. ii., 

 fuscis, ut in F. tuheroso cancellatis ; norm. ii. et dimidio, altis, 

 valde tumentibus, carinatis ; carinis iv., validissimis, acutissimis, 

 quarum ii. in spira monstrantur ; carinulis aliis antice et postice 

 plus minusve expressis ; tota superficie minute spiraliter striata ; 

 cariuularum basalium interstitiis subobsolete decussatis; apertura 

 late semilunata ; labro a carinis valde indentato j labio recto, an- 

 gusto ; umbilico magno, carinato ; operculo fusco, valde pauci- 

 spirali, minutissime ruguloso, nucleo antico. Long. '08, long, 

 spir. -03, lat. -08 poll., div. 90°. 



27. Litorina pullata. 



Jj. testa parva, solidiore, luctuosa ; spira satis exserta ; nigrescente, 

 seu livido-fusco tincta, lineis spiralibus exilissimis pallidioribus or- 

 nata ; interdum obscure tessellata ; anfr. v., subplanatis, suturis 

 parum impressis ; sublsevi, striolis spiralibus tenuiter insculpta ; co- 

 lumella intus incrassata; pariete baud excavato. Long. '4, long, 

 spir. -18, lat. -29 poll., div. 60°. 



= Litorina, sp. ind., Maz. Cat. no, 399, p. 350. 



28. Litorina {Philippii, var.) penicillata. 



L. Ph. testa parva, lineis radiantibus, variantibus, delicatulis, rarius 

 ziczacformibus, et cingulis duobus spiralibus, quorum unum in 

 spira monstratur, elegantissime penicillata. Long. '33, long, 

 spir. -14, lat. -2 poll., div. 50°. 



Closely resembling the West-Indian L. ziczac, var. lineata, 

 D'Orb. Intermediate specimens, however, clearly connect it 

 with the common Mazatlan form. 



29. Rissoa alholirata. 



R. testa parva, alba, crystallina, normali; marginibus spirae undatis; 

 anfr. nucl. iii., laivibus, mamillatis ; norm, iv., medio subconvexis, 

 postice supra suturas planatis ; basi subplanata, efFusa, baud um- 

 bilicata ; lirulis spiralibus crebris, obtusis, quarum circ. x. in spira 

 monstrantur ; apertura subovata, peritremate contiuuo ; labro 



216 



