108 ISCHNOCHITON. 



lateral areas with black, as in some of the specimens from Fernando 

 Noronha. The granules or scales of the lateral area and on the 

 front and posterior valves are peculiarly flat and are somewhat 

 transversely arranged on the former and concentrically on the lat- 

 ter. The central areas are finely punctured along the center, and 

 become more and more coarsely granosely lirate as the sides are 

 approached. One example is almost entirely reddish purple, and 

 others are blackish with a broad pallid stripe down the middle from 

 end to end. (Smith.') 



Chiton (Ischnochitori) caribbceorum CPU., MS., SMITH, Journ. 

 Linn. Soc. Lond., xx, p. 496, t. 30, f. 5, 5a. 



The dimensions given by Smith may possibly be a mistake, for the 

 size mark on his plate is only 13s mill. long. In other respects the 

 description and figures indicate no tangible points of difference 

 from the I. striolatus. 



Carpenter's original description of carribceorum is before me, 

 and it is an excellent word picture of some of the St. Thomas spec- 

 imens of striolatus. It is worthy of note that Carpenter recognized 

 the specific identity of striolatus, caribbceorum, jamaicensis and 

 squamulosis, in one of his later notes. 



I.(f caribbceorum var.) jamaicensis Cpr. Smaller than caribbce- 

 orum, the lateral areas scarcely defined. 



Length 7$, breadth 4, alt. 1} mill. Habitat, Jamaica. 



/. (f jamaicensis) viridior Cpr. Larger than I. jamaicensis, 

 green, variously maculated with olive; interior: posterior valve 

 having 8, anterior 9, central valves 1 slit. Length 11], breadth 7 

 mill.; divergence 100. There is no character but size and color 

 by which this solitary specimen can be distinguished from the 

 Jamaican shells. (Cpr.) 



The specific identity of these two MS. forms with /. striolatus was 

 conceded by Carpenter. 



I. funiculatus Carpenter. Shell small, strongly oval, subelevated, 

 the jugum little acute ; pale ashen, ochraceous or olivaceous varie- 

 gated; mucrcfc central, moderately prominent. Entire surface 

 wrinkled and minutely pitted ; wrinkles subregular, nearly paral- 

 lel with the dorsal ridge on the central areas, about 18 on each side, 

 obsolete toward the jugum ; the moderately distinctly, defined lat- 

 eral areas and the end valves undulated and having subobsolete 

 radiating lirulse. Interior: posterior valve with 7-9, anterior valve 



