358 SHELLS AND SHELL-FISH. PART II. 



mantle rough, with moveable spines, prickles, setace- 

 ous hairs, or granules. 



C. spinosus. Sow. Gen. f. 1. 



PHAKELLOPLEURA Guild. Plates moderate ; the mantle 

 ornamented with a single series of tufts of radiating 

 hairs. 



P. fascicularis. Sow. Gen. f. 3. 



CHITONELLUS Lam. Body larvaeform ; plates small, 

 detached ; mantle naked ; sides with punctures, re- 

 sembling spiracles. 



C. larviformis Burrows, latus Guild. Z. J. xvii. p. 78. 

 CRYPTOCONCHUS Blainv. Plates moderate, entirely co- 

 vered with the soft down of the zone, each plate 

 having two lateral and tabular pores, and four on the 

 anterior plate. 



C. porosus Burrows. 



TRIBE 5. TECTIBRANCHIA. The Sea Slugs. 



Body naked ; branchia generally covered by a coriaceous 

 or testaceous plate, or oviform shell, which is more or 

 less concealed in the mantle, or its lobes ; eyes sessile, 

 minute. 



SUB-FAM. 1. PHYLLIDIN.E. 



Shell none ; body shaped as in Chiton ; mantle coria- 

 ceous ; branchia folliculated, placed on both sides of the 

 body, under the edges of the mantle j tentacula small, 

 short, two or four. 



PHYLLIDEA Cuv. Shape oval ; tentacula four, the 

 upper pair cylindrical and pointed, the under very 

 small, inferior, and placed on the side of a small 

 mouth. 



P. pustulosa. Rlipp. Atlas, i. pi. 7. f. 1. 



DIPHYLLIDEA Cuv. Posterior end narrowed ; tentacula 



two, the inferior pair represented by two tubercles. 



D. Hneata Otto. 



