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



arcuato, vix antice et postice simiato, calloso ; labio valido. 

 Long. -1, long. spir. "08, lat. '04 poll., div. 'J.")°. . 



30. Fenella cri/staUina. 



F. testa alba, subdiaphana, turrita, rudiore ; marginibiis spirse rectis, 

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

 rotundatis, suturis impressis ; costis radiantilnis circ. xvi.. valJe 

 rotundatis, hand extantibns, interstitiis latis ; striis spiralibus 

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

 tuudata ; peritremate continuo ; labro cxtus varicoso ; labio cal- 

 loso. Long. '14, long. spir. "ll, lat. '05 poll., div. 20°. 



31. 1 Hydrobia compacta. 



?^. testa Isevi, curta, compacta, latiore; marginibus spirae vix ex- 

 curvatis ; anfr. nucl. normalibus, apice maniillato ; norm, iv., tn- 

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

 Subovata ; peritremate continuo ; labio defiaito. Long. 04, long, 

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



This unique shell may be a Barleeia. 



32. Hyala rotundata, 



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

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

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

 data, ad suturam subangulata ; peritremate continuo ; labio a 

 pariete separato, rimulam umbilicalem formante ; columella valde 

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



A unique shell, resembling a marine Bithinia. 



33. IDiala electrina. 



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

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

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

 suturis distinctis ; sculptura baud expressa ; tota superficie cos- 

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

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

 costulis radiantibus circ. xviii., subobsoletis ; apertura ri'gulariter 

 ovata, ad suturam angulata, peritremate continuo ; basi baud 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. 

 Isevibus ; norm, vi., subplanatis, suturis distinctis ; lineis crcbris 

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

 adolescente lirulis radiantibus obsoletis decussata ; apertura snb- 

 ovali; columella solida, imperforata. Long. •42, long. spir. -a, 

 Int. -16 poll., div. 25^ 



217 



