from CliUi. 197 



longitudinal striae; a prominent row of raised dots extending from 

 the apex to the anterior angles of the valves separates the com- 

 partments ; the posterior jiortion glossy, with fine concentric 

 striaj : the posterior margins with tooth-like granulations. Last 

 valve striated like the anterior compartments of the others, and 

 rising into rather a prominent beak, leaning towards the posterior 

 margin ; from under the beak are raised dots, disposed in a simi- 

 lar manner to those on the anterior valve. 



Border coriaceous, thick, broad, rough, greenish or orange 

 coloured, and in the ypunger specimens thickly studded with 

 blunt spines, but in the old shells the spines are short and scanty, 

 and generally covered with corallines; the inner edge of the border 

 inserting itself under the posterior angles of the valves, has the 

 appearance of being deeply serrated. We have found this species 

 five inches in length, and nearly three in breadth. 



These inhabit the rocks on the coast of Chili ; at Valparaiso we 

 found several specimens in very exposed situations, so much so 

 that collecting them was attended with much dilRculty, and not 

 unfrequently with danger, from the violence of the sea breaking 

 •on the rocks, to which they attach themselves very strongly. 

 They are generally covered with short sea weed. 



We have been obliged to alter the name a second time, because 

 the name aculeatus give;i to it by Barnes, was long since pre- 

 viously occupied ; that of tuberciiliferus was given from an old 

 specimen, in which the spines were reduced in Icngtii by being 

 broken, so that it is not applicable : we have therefore now called 

 it spiniferus. 



** LIGAMENTO MAKGINIS SQUAMOSO. 



2. C. Coquimbcnsis. 



C. testa oblongo-ovata, angusta, intusfusca; ligameiito niargiuali 

 lato, squamis oblongis, longitudinalibus ; valvaruni lateribus 

 undato-sulcatis. 



Tab. Supp. XVI. f. 2. 

 Shell ovate, narrow, opaque, greenish brown, shinijig; inside 



blackish : valves eight, the autcrior with numerous uuduJate con- 



