VOL. \l 



] PROCEEDINGS OF THE NATIONAL MUSEUM. 339 



' This shell is very like Valvata sincera, though smaller and of an 

 olivaceous brown when perfect. The aperture is sometimes slightly 

 thickened inside, so it may prove to be a Molleruu I have not seen the 

 operculum and the generic reference is merely provisional. 



I regard the genus Adeorbis as closely related to Slcenea, with which 

 it may possibly be necessary to unite it. But though the type is Rissoid, 

 doubtless numerous species belonging to the Gyclostrematidw or other 

 Trochoid groups may have been referred to it in the absence of the 

 soft parts. 



Family C ALYPTfLE I D . E . 



Genus MITRULARIA Schumacher. 



Mitrularia equestris Linne". 



Collected at the Abrolhos Islands, Brazil. 



Genus CREPIDULA Lamarck. 



depidula (Sandalium) aculeata Gmeliu. 



Collected at Station 2702, east of Rio Janeiro, in 59 fathoms; Sta- 

 tions 2704 and 2705, in 10 to 12 fathoms, off the Rio de la Plata. 



Family CAPULID^:. 

 Genus CAPULTJS Montfort. 

 Capulus incurvatus Gmeliu. 

 Collected at the Abrolhos Islands, Brazil. 



Family AMALTHEID.lv 



Genua AMALTHEA Schumacher. 



Amalthea effodiens Carpenter. 



Collected at Station 275S, 90 miles southeast from Cape San Roque, 

 Brazil, in 20 fathoms, gravel. 



Amalthea antiquata Linue". 



Amalthea costellata Carpenter. 



The preceding two species were found at the Abrolhos Islands, near 

 Porto Allegre, North Brazil. 



Family NATICIDiE. 



Genus NATICA Lamarck. 



Natica canrena Lamarck. 



Collected at Station 2702, east from Rio Janeiro, in 5!) fathoms, mud, 

 and Station 2705, off the Bio de la Plata, in U)\ fathoms j temperature 

 57°.l F. 



