134 ISCHNOCHITON. 



I. NEBULOSUS Carpenter, n. sp. Unfigured. 



Shell oval, little elevated, the jugum acute ; mucro slightly- 

 elevated ; brown-olive, elegantly dotted and clouded with darker,, 

 and sometimes maculated with ashy or roseate. Central areas gran- 

 ulated in a somewhat quincuncial manner, rather regular lines- 

 radiating from the jugum. Lateral areas scarcely elevated, having 

 3 to 5 scarcely projecting radiating wrinkles ; end valves having 30 

 to 40 subobsolete radiating wrinkles, and granulated like the central 

 areas. Interior: posterior valve having 11, central valves 1, ante- 

 rior valve 11 slits; teeth acute; eaves large; sinus moderate, flat,, 

 smooth. Girdle variegated, regularly covered with solid, large, sub- 

 rotund smooth scales. 



Length 15, breadth 10 mill. ; divergence 110. (Qor.) 



St. Vincent, Cape Verde Is. 



Curiously like I. comptus in color and sculpture, but that species- 

 has the scales extremely finely striated, the side areas a little more 

 decided, the granulation less regular, the painting more sombre and 

 the sutures tessellated. These minute differences, joined with the wide 

 separation in locality, probably denote a different origin. (Qor.) 



The type is no. 88 of the Cumingian collection. 



I. OBTUSUS Carpenter, n. sp. Unfigured. 



Shell small, strongly elevated, oval, the jugum little acute; mucro- 

 median, conspicuous. Reddish-brown, variously maculated with 

 paler. Central areas having about 10 subparallel deep sulci on each 

 side, obsolete upon the jugum; lateral areas with 3 to 4 radiating 

 wrinkles, sometimes divaricating, the end valves having 20 to 40, 

 here and there interrupted by wrinkles of growth. Interior: pos- 

 terior valve having 8, central valves 1, anterior valve 9 slits; slits 

 small, teeth very short and obtuse, sometimes rugulose or almost 

 pectinated ; calloused inside ; eaves small ; sinus moderate, excurved, 

 smooth. Girdle furnished with very close, small, very solid, rounded, 

 smooth scales. 



Length 12i, width 11 mill.; divergence 85. (C>r.) 



Portugal (Mus. Cum., no. 105.) 



A remarkable shell, presenting some general resemblance to 

 mertensii in the appearance of the valves. The girdle scales are as 

 small as in Trachydermon, but very solid. The specimen is much 

 worn outside, which may account for the bluntness and callosity of 

 the teeth. (Opr.) 



