242 PUNCTURELLA. 



irregularly in the middle and slowly contracting to a small narrow 

 point in front. The old scar is a shallow furrow with sharp sides ; 

 and the bottom is scored across with old edge-lines. Margin thin, 

 toothed and crimped on the edges by the ribs. Inside porcellanous, 

 somewhat indented on the line of the ribs. The apex is deeply hol- 

 lowed ; a deepening and widening groove extends from the margin 

 to the slit, which is shortly covered by the regularly curved, strong, 

 unbuttressed septum. Length O'S, breadth 0'62, alt. 0'32 inch. 



This North Atlantic species is exceptionally large. In outline it 

 somewhat resembles Rimula cognata Gould. My remembrance of 

 that species is that it is quite small ; but Gould figures it large and 

 gives no indication of size beyond saying that it is small. P. astur- 

 iana further differs from it in being much rounder and lower with 

 a more depressed and reverted apex, and a slit much more remote 

 from the top. 



Bay of Biscay, 600-1100 fins. ; Gulf of Mexico, 85-640 fins. 



Rimula asturiana FISCHER, Journ. de Conchyl 1882, p. 51. 

 Puncturella (Cranopsis) asturiana WATS., Challenger Gastr. p. 45, t. 

 4, f. 4. Cranopsis asturiana DALL, Blake- Gastrop. p. 404. 



Dr. Dall has demonstrated the presence of a verge in this species. 



P. GRANULATA Seguenza. PI. 25, fig. 28. 



Shell porcellanous white under a meagre yellow epidermis, rather 

 thin, narrow, broader in front, oblong, with a depressed and reverted 

 top and incurved apex ; the side slopes are steep and slightly con- 

 vex, the front edge is long and very convex, the back slope is concave 

 in consequence of the overhanging apex ; the small close-set radiat- 

 ing ribs are beaded with contiguous small rough tubercles ; the long 

 narrow fusiform slit rises very high, and is remote from both apex 

 and margin. Sculpture : From the apex over 100 small irregular 

 and unequal riblets radiate to the margin ; they are closely beset 

 with small rough tubercles like beads ; there are no concentric 

 threads, but a few unequal lines of growth can be seen ; the riblet 

 which runs from the slit is double, with a minute furrow between 

 the riblets; its direction is not quite constant in different specimens. 

 Color : The shell is pure white, porcellanous under the thin straw- 

 yellow membranaceous epidermis, which is rather caduous. Apex 

 very much reverted and depressed so as to stick out backwards 

 bluntly, but prominently in the mid-line of the shell; the minute 

 smooth white tip stands out on the right with considerable distinct- 



