1 , t ; ,in 



Tliis species is remarkable for the somewhat triangular imbricate 

 BOalefl of the ligament ending In slmrp i>iutc<l nmcmnes; the liga- 

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

 the lateral areas are four, inurieated with sharp granules. (Ad.} 



Sy<li-:. V. N. W<tles t Australia, under Btonea at low water. 

 (Strange.) 



Ctntnn A. AD., P. Z. S. 1852, p. 91, t. 16, f. Q.Lophy- 



nis MurtMtua AN..AS, 1>. /. S. 1865, p. 186; 1867, p. 222. Clntn 

 /ini'ins and C. carn*n* CIM:., J/.s'N. 



Varies in color from dull green to orange and bull'. 



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

 it to be identical with his own unpublished (.'. lii<tiis; the descrip- 

 tion of which here follows: 



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

 inent ; olivaceous, maculated with paler ; entire surface minutely 

 punctate; central areas having about 14 grooves on 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 23], breadth 12*, divergence 100. 



The points of the striated scales project, as in Isc/i. australis, so as 

 to give the girdle a rasp-like appearance. 



Yar. nurnntlns Cpr. Shell smaller, pale orange colored, dotted 

 with more intense; posterior valve with 10 slits. 



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



Like the preceding in all important character?, but differing 

 remarkably in color and pattern. 



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

 received the name carnosns ( 'pr. The original description in Carp- 

 enter'- .1/v !>efore me, indicates the following as the m<t important 

 characters of cnrnosmt : Central areas having about 18 suhparallel 

 -ulci on each side, more prominent toward the margin, obsolete 

 toward the jugnm ; lateral areas and end valves having irregularly 

 (at the sutures strongly) nod.e wrinkles, 4 in number on the >ide 

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



