390 NEW M'ARINE MOlLLUSCA. 



oval; outer lip curved, sharp at the edge, but backed by 

 a heavy varix; within strongly toothed opposite the ribs; 

 the inner lip spreads a broad band of enamel over the 

 arched columella. Sculpture; The first spire whorl has 

 numerous smooth axial ribs, the second has the same, 

 but the ribs are slightly grooved by obscure depressed 

 concentric lirse; the remaining whorls are strongly can- 

 cellated by axial and revolving grooves; in each of the 

 latter is a small keel; the square meshes so produced are 

 each occupied by a round pustule, giving the shell a beau- 

 tiful granular appearance. 



Length, 13 m.m. ; breadth, 5.3 m.m. 



Locality: Type from 80 fathoms 10 miles east of 

 Schouten Island, with two others immature. 



This species has some resemblance to P. reticulata, 

 but besides being only about one-third the length, there 

 is considerable difference in the sculpture, especially on 

 the upper whorls. For comparison I have added a figure 

 of the apical portion of an ordinary example of P. reticu- 

 lata, drawn to the same scale of magnification. 



HEMIPLEUROTOMA ESPERANZA, N.S. (PL. 

 XIV., EIG. 15.) 



Shell dull white, high, attenuate anteriorly; whorls 

 six, strongly angular, and including a smooth blunt two- 

 whorled protoconch. Sculpture : A strong keel angles 

 the periphery, another less strong half-way to the lower 

 suture, and a third margins the suture; on tlie upper 

 slope are two or more faint spirals. Numerous axial 

 lirje cancellate the shell and pass over the keels, rendering 

 them nodulous; they disappear on the lower part of the 

 body whorl, which is occupied by about eight smooth 

 spirals; mouth subquadrate, contracted in front to form 

 a short open canal ; outer lip strongly angled at the carena, 

 forming a wide, triangular sinus; below corrugated by the 

 sculpture; inner lip curved. 



Length, 5.3 m.m.; breadth, 2 m.m. 



Locality: Type from 24 fathoms in Port Esperance; 

 also from 40 fathoms three miles east of Schouten Island; 

 one example. These localities are some 150 miles apart 

 by water. A very distinct little species, slightly recalling 

 M. mavi Wmxo. 



