237 



Genus Amnicola, Gould & Hakleman (Inverteb. of Massachusetts, 



1841.) 



Testa ovato-conica, cornea, tenuis : spira acuta, anfractibus paucis 

 rotundatis : apertura parva, obliqua, rotundato-ovata ; peristomate 

 simplici, continuo : operculum corneum, pauci-spirale. Incola? caput 

 proboscidiforme sub-bifiduni ; ore inferiore, vibracula setacea ; oculis 

 basalibus, externis; solea subovata, antice truncata, angulls exten- 

 silibus.. 



Allied to Paludinella, and distinguished from Paludina by its small 

 size, elongated head, paucispiral operculum, &c. 



PROCEEDINGS OF THE BOSTON SOCIETY OF 

 NATURAL HISTORY. 



[£7= Vol. viii. 280, (February, 1862.) 



Vertigo nacca. T. ovata, lucida, alabastrica, tenuissime striata; 

 anfr. 4 -(- ventricosis ; apice obtuso ; sutura profunda : apertura sub- 

 circularis dente palatali (interdum bifido) dente columellari, dente 

 basali denteque labiali armata ; peritremate valde reflexo ; umbilico 

 rimato. Axis. J^ ; diam. -jL poll. Hab. Hawaii. Dr. Newcomb. 



The denticles are similar to those in V. Gouldii and V. iantilla. The 

 latter is smaller, has a rugose surface, and one more denticle. 



Nassa plicatella. T. parva, elongata, ovato-conica, acuminata, 

 sublivida et fascia albida cincta, longitudinaliter confertim plicata et 

 striis volventibus plicas haud secantibus cincta ; anfr. 7 planulatis ; 

 sutura bene impressa et marginata : apertura angusta, elliptica, postice 

 acuta: labro simplici : sinu obliquo, vix reflexo. Axis 15; diam. 17 

 millim. Hab. British Burmah. Mr. Benjamin. 



Resembling somewhat N. achatina, though very much smaller. 



Chrysallida ctjrtina. T. minuta, ovato-turrita, albida ; spira? 

 anfract. 6-7 convexis, seriebus granularum quatuor cancellatis, granulis 

 antice sensim defuentibus, anfr. ultimo dimidiam longitudinis testae 

 superante : apertura angusta, antice producta ; columella postice plica. 

 munita. Long. 5 ; lat. 2 millim. Inhabits S. Carolina. 



It has the aperture, and in general the sculpture of Chemnitzia, 

 with the columellar fold of Odostomia. 



DunKeria suturalis. T. minuta, eborea, turrita ; anfract. 7-8 

 convexis, longitudinaliter 10-12 plicatis (plicis antice evanescentibus) 

 et striis volventibus tenuibus cinctis quorum una subsuturali bene 

 impressa ; anfract. ultimo dimidiam longitud. testse breviore : apertura 

 lunata, trientem longitud. testa? brevior. Long. 3 -(- ; lat. 1 millim. 

 Hab. Fort Johnson, Charleston Harbor, S. C. 



This minute shell belongs to the Chemnitzia?, with strongly marked 

 sculpture, and with ventricose whorls. 



