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



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

 lat. •Spoil., div. 110°. 



25 . Fossarus parcipictus. 



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

 fusco varie maculata ; carinulis spiralibus acutioribus, quarum 

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

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

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

 lat. -2 poll., div. 90°- 



Tbe few specimens found are very variable in outline. 



26. Fossarus purics, 



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

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

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

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

 plus minusve expressis ; tota superficie minute spiraliter striata ; 

 carinularum 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. 'SS, 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. 

 B. testa parva, alba, cryslallina, normali; marginibus spirre undatis; 

 anfr. nucl. iii., Isevibus, mamillatis ; norm, iv., medio subcoiivcxis, 

 postice supra suturas planatis ; basi subplanata, effusa, baud im> 

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

 monstrantur ; apertura subovata, peritremate continue ; labro 



216 



