NASSA. Panama Shells. 65 



Station. — Unknown. 



Habitat.— Tahoga ; G. B. A. ! 

 One specimen was obtained. 



S3. IVassa scabriuscula ? 



St/nonymt/. 

 Naasa seabriuscula Powis in Proc. Zool. Soc, Lond. p. 96. June. 1835. 



Our specimens are mostly pale olivaceous or glaucous, with 

 the granules, upper part of the Iftbrum, and a spiral stripe, of 

 a dingy white. Mr. Powis describes his shell as fusca luteo 

 fasciata. 



Var. a is deeply tinged with black, and has some pure 

 white spots at the upper part of the labrum. 



Var. b is black, more gibbous, and is wholly covered with 

 granules. 



Station. — Sandy mud at a depth of 12 fathoms ; Cuming ! 

 Powis. 

 Our specimens were found on sand, usually not far below 

 high water mark, where water runs during the recess of the 

 tide ; also in similar situations near low water mark. 



Habitat. — Bay of Montija ; Cuming ! Powis. 

 Panama ; B. Jewett ! Gould Mss. 

 Panama ; C. B. A. ! 



We collected 380 specimens. , 



61. IVassa striata.— Nov. sp. 



Shell long ovate conic : white about the aperture, other- 

 wise dingy white more or less tinged with yellowish brown : 

 with, on each whorl, twelve or thirteen small ribs, and many 

 coarse spiral striae : spire with the outlines a little curvilinear : 



apex acute : whorls eight, convex, with a well impressed su- 

 17 



