39 



the genus. It approaches in some respects the character of 

 the sub-genus Perinnia, created by H. and A. Adams. 



LlOTIA EOBLINI, 71.S. 



Shell small, discoid, spire depressed ; nucleus somewhat 

 sunk ai)d flattened ; whorls 4, ornamented with 6 to 7 

 sharply prominent regular longitudinal carinse, which are 

 crossed by sharply angled transverse ribs at regular intervals, 

 14 on last whorl ; at points of intersection the longitudinal 

 carinsQ are projected into sharply angulate squamose nodes ; 

 interstices and nodes marked by fine sharp wavy striae ; 

 aperture round, reflexed, with thickened margin ; umbilicus 

 deep, narrow, nearly closed by the lamellose nodes. Dia. 

 mag. 6|mil., min. 5mil. Eare, Table Cape. This shell may 

 possibly be the L. discoidea which the Eev. J. E. Tenison 

 Woods describes as occurring at Table Cape. I cannot trace 

 a fossil L. discoidea in my type collection. As some of the 

 specimens were imperfect when submitted by me to Mr. 

 Woods, it is just possible that it might be mistaken for the 

 existing L. discoidea, to which it is closely allied, but differs 

 in size, number of carinas and ribs. Otherwise it has a 

 marked resemblance to L. lameUosa, Ten. Woods. 



PiLEOPSIS NAVICELLOIDES, 71.S. 



Shell minute, depressed, subrotund ; nucleus scarcely laxj 

 exserted, of about IJ smooth turns, submarginal ; disk with 

 rough uneven sui'face, concentrically irregularly striate ; 

 aperture ovate, closed at posterior margin by a spiral concave 

 shelf, terminating on either side by a downward reflexed 

 curve in the muscular impressions, which are well defined ; 

 margin imeven, simple. Dia. mag. 3|, min. 3, alt. 1. Eare, 

 Table Cape, 1 specimen. 



PORTLANDIA AtKINSONI, U.S. 



Shell very minute, trigonal, subdeltoid, subnacreous 

 interiorly, inequilateral ; posterior slope truncated ; surface 

 of valves concentrically finely ridged, which increase in size 

 and frequently anastomose towards centre and margin ; 

 ridges traversed by fine radial lines (visible also in the 

 inner surface), which form a beautifully crenulated margin 

 seen from the inner side of both valves ; umbones sharply 

 incurved ; ligamental area inconspicuous ; teeth, 6 on 

 posterior slope, 10 on anterior, which increase in size towards 

 middle of slope, the larger teeth slightly bent and lamellar ; 

 limule shallow (scarcely defined), broadly lanceolate. Trans- 

 verse long. SJmil., lat. 3Jmil., thickness of both valves IJmil. 

 Eare, Table Cape. 



CUCULLEA MINUTA, n.S. 



