176 CHITON. 



f 



This species is remarkable for the somewhat triangular imbricate 

 scales of the ligament ending in sharp pointed mucrones; the liga- 

 ment is tessellated with pale fuscous and dark brown ; the ribs on 

 the lateral areas are four, muricated with sharp granules. (Ad.) 



Sydney, N. S. Wales, Australia, under stones at low water. 

 (Strange.) 



Chiton muricatus A. AD., P. Z. S. 1852, p. 91, t. 16, f. 6. Lopliy- 

 rus muricatus ANGAS, P. Z. S. 1865, p. 186; 1867, p. 222. Chiton 

 limans and C. carnosus CPE., MSS. 



Varies in color from dull green to orange and buff. 



Carpenter examined Adam's type of this species, and ascertained 

 it to be identical with his own unpublished C. limans ; the descrip- 

 tion of which here follows : 



Shell oval, elevated, the jugum acute; mucro median, subprom- 

 inent ; olivaceous, maculated with paler ; entire surface minutely 

 punctate; central areas having about 14 grooves 011 each side, 

 obsolete in the middle ; lateral areas having two riblets, sometimes 

 bifurcating or with another intercalated, furnished with strong acute 

 tubercles, interstices smooth ; end valves with 10-20 such riblets. 

 Interior : anterior valve having 8, central 1, posterior valve 9 slits ; 

 teeth normal ; sinus moderate, with about 15 denticles. Girdle 

 furnished with large and small wide, distinctly striated, elevated, 

 acutely pointed scales. 



Length 231, breadth 12J, divergence 100. 



The points of the striated scales project, as in Iscli. australis, so as 

 to give the girdle a rasp-like appearance. 



Var. aurantius Cpr. Shell smaller, pale orange colored, dotted 

 with more intense; posterior valve with 10 slits. 



Length 17J, breadth 10 mill.; divergence 100. 



Like the preceding in all important characters, but differing 

 remarkably in color and pattern. 



A form in which the sculpture of the side areas is less developed 

 received the name carnosus Cpr. The original description in Carp- 

 enter's MS. before me, indicates the following as the most important 

 characters of carnosm: Central areas having about 18 subparallel 

 sulci on each side, more prominent toward the margin, obsolete 

 toward the jugum ; lateral areas and end valves having irregularly 

 (at the sutures strongly) nodose wrinkles, 4 in number on the side 

 areas, 22 on the anterior, 14 on the posterior valve, sometimes 



