52 



lato ; sutura impressa: apertura ovata, peristomate continuo, 

 obtuso, fusco. Long. £ ; lat. - f V poll. Hab. Banks' Peninsula, 

 N. Zealand. 



A small elongated species like A. jweissii of New Holland. 

 Its color .and its dark obtuse peristome give rather marked char- 

 acters to a shell so small and simple. 



Amnicola egena. Testa minuta, tenuis, sub-perforata, elon- 

 gato-turrita, epidermide virescente induta : spira acuta, anfr. 5 

 convexis; sutura profunda: apertura ovata; peristomate con- 

 tinuo, labro acuto, patente. Long. I ; lat. y 1 ^ poll. Hab. Banks' 

 Peninsula, N. Zealand. 



Mure slender and less solid than A. badia, and of an entirely 

 different color. It is very much like Paludina acuta of Europe. 



Lacuna carinata. Testa parva, tenuis, ovato-globosa, epider- 

 mide cornea tenui undulatim striata induta: spira anfr. 5 ventri- 

 cosis, ultimo carina filosa cincto : apertura semicircularis dimidiam 

 testae adaquans ; columella rotundata. Long. -j 3 - ; lat. \ poll. 

 Hab. Puget Sound. 



In color and marking much like L. vinctaof our shores. Our 

 shell sometimes has the last whorl perceptibly angular, but it 

 never has the filiform carina. 



Litiopa decussata. Testa parvula, perfragilis, acuto-conica, 

 badia: spira anfr. 8 convexis, transversim striatis, apicalibus 

 plicatis : apertura ovata antice subtruncata ; labro simplici ; col- 

 umella arcuata, antice unidentata. Long. ■£§ ; lat. ^ poll. 

 Found on floating wood, lat. 37° 40' N., long. 54° 30' W. 



Agrees well with L. striata, Pfeiff., except that it is less than 

 half the size. 



Littorina patula. Testa magna, solida, rudis, rotundato- 

 ovata, cinereo-olivacea albido maculata : spira anfr. 5, ultimo 

 magno, ventricoso ; sutura vix impressa : apertura ampla, ro- 

 tunda ; columella lata, excavata, alba ; facie ventrali testa) quasi 

 attrita, et macula fusca notata. ; fauce castanea, antice albo- 

 vittata. Long, f , lat. 4 poll. Hab. San Francisco. 



Remarkable for the amplitude of the aperture, the broad 

 excavated columella, apparently ground away by the protrusion 

 of the operculum. 



Littorina lepida. Testa parva, solida, elongata, biconica, 



