44 NOTES ON A COLLECTION OF CALIFORNIAN NUDIBRANCHS. 



and quadrangular. The inner ones bear one or two cusps, but much lower 

 and less developed than in the larger tooth. The cusp gradually decreases 

 and the 3 — 4 outermost are mere plates. I did not find more than 10 uncini 

 in any specimen. The verge is armed with small irregularly shaped spines. 

 This form offers a most curious superficial resemblance to an aeolid. 

 Not only are the papillae set in transverse row, but the spiculous axis which 

 they contain, and which is visible through the transparent skin, looks very 

 like the hepatic ramifications found among cladohepatic nudibranchs. The 

 animal is, however, obviously allied to Triopha, but is distinguished from it 

 more clearly than hsa and Triopha in virture of the arrangement of the 

 papillae, the buccal parts, and the lateral ridges. 



Aegires albo-punetatus, MacFailmd. 



Mac Farland : I.e., p. 45. 



One specimen probably from San Pedro, but not to be identified with 

 those in Cockerell's list. Length 10.5 millim. ; width across l)ack 4 miliim.; 

 across foot 2 millim. ; height in front of the branchiae 4.5 millim. The body 

 slopes up to the branchiae and then downwards posteriorly. The head is 

 rather broad, the tail tapering ; the integuments are hard and full of spicules, 

 which have mostly the shape of curved rods. The colour is a pale dull 

 yellow, with a few dark spots scattered irregularly here and there between 

 tubercles. These latter are arranged in fairly symmetrical rows, but as there 

 are also tubercles l)etween the rows, the symmetry is not complete. There 

 seem to l)e three main rows on each side of the central dorsal space, which 

 bears two or three tubercles, and the two innermost unite in front to form 

 one line between the rhinophores. The third line is more or less continuous 

 with the frontal veil, and, as in Alder and Hancock's plate of Aei/in's jmncfilu- 

 t-ens, seems to mark the boundary of the dorsal surface and passes behind the 

 branchiae, but (also as in Ae. punctilumntf,) there are other rows of tubercles 

 below it, and on the tail to the very end. 



The oral veil is rather broad, rounded, and as preserved, is drawn down 

 to the sole of the foot. It bears many crowded tubercles airanged irregu- 

 larly in 4—5 rows. The tubercles vary in size, the larger being about 1.5 

 millim high, and are cylindrical with flattish tops, bearing a few minute in 

 conspicuous hispid or spiculous processes. The rhinophores are stout, 

 whitish, completely retracted, and with no signs of perfoliation. The right 

 rhinophore pocket is surrounded by four, and the left by five tubercles, of 

 which the outer are the larger, Ijut there are only slight traces of a common 

 rim connecting these tubercles. The branchiae are small, white, tripinnate 

 and Lear 4 — 5 main ramifications. I'.efore each of them stands a large 

 tubercle which l>ends over the plume, without closing over it as in Nnfoilori^. 

 The anterior tubercle is deeply three-lobed ; those at the sides four-lobed. 



The intestines are whitish, except the liver which is grey, The central 

 nervous system apj)ears to be much as in A>\ iinncfilnc'iix -^s figured l)y ISergh. 



