86 PROC!EEDINGS OF THE ACADEMY OF [1894. 



middle; the pie urn aeulptured with deep narroiv (j mores, separated by 

 intervals about double their width, and extending but a short distanee 

 forimrd from the diagonal line, except that the outer three or four 

 i^rooves extend to the anterior edge of the tegmentum. About U or 

 10 grooves may he counted on each side of a valve. Anterior valve 

 much larger than tlie posterior, unsculptured. Posterior valve hav- 

 ing the muero acute, about central, distinctly projecting; the posterior 

 slope concave. 



Interior bluish or creamy white; sinus notched at the sides, deli- 

 cately denticulate. Anterior valve having 8, intermediate valves 

 1-1, posterior valve 12 slits; teeth pectinated outside and on the 

 edge. 



Girdle rather wide, densely clothed with imbricating-, convex, 

 shining scales which are densely and most minutely striated, have 

 the usual low rounded outlines, and measure in breadth -30 mm. 



Length 18, breadth l-i mm.; divergence 90° to 110°. 

 Port Jackson (Dr. J. C. Cox). 



This is probably the Lophi/rii.< jngoxiis of Angas, P. Z. S. , 1867, 

 p. 222. 



It is allied to ( '. jngosnx Gld. but differs totally in color-pattern. 

 The girdle scales are smaller than in a s})ecimen of jiigosiis of the 

 same size; the grooves in front of the diagonal line are narrower, with 

 wider interspaces, etc. 



Genus LOfilCELLA Pilsbry. 



This name was proposed originally as a section of Lorica. At that 

 time I had seen no specimens of L. Angasi, its type. Several alco- 

 holic examples are now before me, showing features not before 

 noticed, which are undoubtedly of generic importance. The group 

 may be characterized as follows: 



Gen. char.: Valves entirely exposed, the front one very large, 

 having numerous unequal, conspicuously pectinated teeth; median 

 valves squared, having a narrow l)i-lobed sinus, slits 1-1; posterior 

 valve small, with posterior inucro, the insertion- plate reduced to a 

 low ridge, nearly smooth and interrupted by a slight sinus behind. 

 Girdle widest in front, having a small slit behind ; densely covered 

 with minute elongated granules and hearing long, branching bristles 

 arranged in radial series. 



In short, Loricella has the general features of Lorica, pln.s girdle 



