Dr. P. P. Carpenter on new Forms of Mollusks. 9 



nrcuato, vix antice et postice sinuato, calloso ; labio valido. 

 Long. !, long. spir. *08, lat. *04 poll., div. 25. 



30. Fenella crystalline*. 



F. testa alba, subcliaphana, turrita, rudiore ; marginibus spirse rectis, 

 parurn divergentibus ; anfr. nucl. ?.. . (decollatis) ; norm, v., valde 

 rotundatis, suturis impressis ; costis radiantibus circ. xvi.. valde 

 rotundatis, haud extantibus, interstitiis latis ; striis spiralibus 

 regularibus, in anfr. penult, xvi. ; apertura rotundata ; basi ro- 

 tundata ; peritremate continue ; labro extus varicoso ; labio cal- 

 loso. Long. '14, long. spir. !!, lat. -05 poll., div. 20. 



31. ? Hydrobia compacta. 



tH. testa Isevi, curta, compacta, latiore ; marginibus spirse vix ex- 

 curvatis ; anfr. nucl. normalibus, apice mamillato ; norm, iv., tu- 

 midis, suturis distinctis ; spira curtiore ; basi rotundata ; apertura 

 subovata ; peritremate continuo ; labio definito. Long. *04, long, 

 spir. -02, lat. '03 poll., div. 70. 



This unique shell may be a Barleeia. 



32. Hyala rotundata, 



II. testa (quoad genus) magna, tenui, alba, diaphana ; anfr. nucl. 

 normalibus, apice mamillato ; norm, iv., globosis, rapide augenti- 

 bus, suturis valde impressis ; basi rotundata ; apertura subrotun- 

 data, ad suturam subangulata ; peritremate continuo ; labio a 

 pariete separate, rimulam umbilicalem formante ; columella valde 

 arcuata. Long. '18, long. spir. '09, lat. '1 poll., div. 40. 



A unique shell, resembling a marine Bithinia. 



33. Wiala electrina. 



?D. testa subdiaphana, rufo-cornea, nitida; marginibus spirse parum 

 excurvatis ; vertice nucleoso, helicoideo ; anfr. iii., tumidis, suturis 

 haud impressis, apice magno mamillato; anfr. norm, iii., subplanatis, 

 suturis distinctis ; sculptura haud expressa ; tota superficie cos- 

 tulis obscuris, latis, spiralibus, quarum vi.-viii. in spira monstran- 

 tur, et iii.-v. circa basim rotundatam, interdum obsoletis, cincta ; 

 costulis radiantibus circ. xviii., subobsoletis ; apertura regulariter 

 ovata, ad suturam angulata, peritremate continuo ; basi haud um- 

 'bilicata ; columella regulariter arcuata. Long. *09, long. spir. *07, 

 lat. -03 poll., div. 30. 



34. Acirsa Menesthoides. 



A. testa nitida, turrita, majore, solidiore, pallide fusca ; anfr. nucl, 

 laevibus ; norm, vi., subplanatis, suturis distinctis ; lineis crebris 

 spiralibus insculpta, quarum circ. viii. in spira monstrantur ; testa 

 adolescente lirulis radiantibus obsoletis decussata ; apertura sub- 

 ovali; columella solida, irnperforata. Long. '42, long. spir. -tf, 

 lat. -16 poll., div. 25. 



217 



