TRIOPA. 71 



Genus II. TM'OPA*, Johnston. 



Body limaciform, subdepressed : mantle small, extended over 

 the head in front, and surrounded with linear or subclavate 

 marginal appendages : dorsal tentacles laminated, retractile 

 within small sheaths : oral tentacles cylindrical : gills plumose, 

 non -retractile : odontophore rather broad, with numerous lateral 

 plates, two on each side near the centre bearing spines. 



Dr. Johnston established this genus for the Doris clavigera 

 of Miiller. The D. lacera of the same author also belongs to 

 it. No other members of the genus are known. It approaches, 

 however, very near to the Euplocamus of Philippi, one or two 

 species of which inhabit the Mediterranean. 



Triopa cla'viger, Miiller. 



T. claviger, Johnst. in Ann. N. H. 1st ser. L p. 124; A. & H. Brit. NiuL 

 Moll. fam. 1, pi. 20. 



Body elongated, white : mantle small, produced and rounded 

 in front, and ending in a point behind ; white, with a few 

 orange or red tubercles on the back, and having the margin 

 surrounded with linear or subclavate processes, the upper por- 

 tions of which are of a golden yellow frequently approaching 

 to orange, but sometimes paler ; those over the head are a 

 little smaller than the others, more closely set, and somewhat 

 papillated ; the side ones are smooth and nearly linear or sub- 

 clavate : dorsal tentacles subclavate, thickly laminated, yellow, 

 issuing from very short sheaths with smooth margins : oral 

 tentacles cylindrical and truncated, folded into a tube open 

 above : gills 3, tripinnate, white, tipped with yellow. L. 0*75. 



Habitat : This pretty species is found from low-water mark 

 to the depth of several fathoms, in the littoral and laminarian 

 zones, on nearly all parts of the British coast, but especially 

 on the south and west. It is rather rare on the north-east 

 coast of England; and specimens got in that district are 

 smaller, broader, and more brilliantly coloured than usual. 



* The name of a son of Neptune. [Properly Triopas, a king of Thes- 

 saly.] 



