86 COCK.ERELL : ON THREE NEW NUDIBRANCHS. 



between the first two tufts of branchiae, in the area just in front of 

 and to the left side of the heart ; a little of the same greenish-blue 

 colour at the bases of the branchial tufts. Branchial papillae reddish- 

 brown, greenish at base, apex white. The heart was observed to beat 

 86 times a minute. 



Hah. — San Pedro, California, on mud flats in the harbour, at low 

 tide, July 19 (W. P. and T. D. A. Cockerell). It occurred with H>;r- 

 misscnda opalescejis (Cooper). Named after Dr. J. G. Cooper, who 

 was the first to study the nudibranchs of California. 



This species has the lingual dentition of Coryphella, and agrees in 

 general type with G. rufihranckialis, except that the lower corner of 

 the lateral teeth in C. cooperi is very much more produced. The 

 median tooth has a large central denticle, and 7 to 10 long sharp 

 denticles on each side ; the lateral teeth are much produced at both 

 ends, with the median portion of the inner face bearing a number 

 (about 10) of small spines, of which the lower five are relatively large 

 and the others very small. 



In having a colour-patch in the region of the heart, C. cooperi 

 resembles Eolis olivacea, but in that species the patch is bright pink. 



Faeelina steapnsi, n. sp. 



Length about 30 millim.; foot narrow, posterior end long attenuate; 

 colour of foot pale pink ; foot-tentacles curled backward, short (about 

 one-fourth length of oral tentacles), brilliant scarlet above ; oral ten- 

 tacles long (7 or 8 millim.), often curled backward, brilliant vermillion 

 above, with white tips, otherwise pink ; rhinophores about half length 

 of oral tentacles, whitish at base, otherwise brilliant vermillion, except 

 the extreme tips, which are white ; the red portion which is somewhat 

 broader than the basal, is very strongly annulated ; eyes very distinct, 

 just behind rhinophores ; branchial papillae tapering, quite long, very 

 pale greyish olivaceous, with the tips brilliant vermillion ; branchiae 

 in eight tufts on each side, so close as not to be readily distinguishable, 

 anterior tufts very large, of about 28 papillae ; sides of head speckled 

 with vermillion ; back white, no colour in region of heart. Teeth 

 very much as in Hermissenda op)aJescen>', with no lateral teeth. A long 

 narrow central denticle, and four long lateral denticles, hardly half the 

 length of the central one. The central denticle is longer and more 

 slender than in H. opalescem. 



Hah. — San Pedro, California, July 19, on mud flats at low tide 

 with the last (W. P. Cockerell). Named after Dr. R. E. C. Stearns, 

 who has contributed to the knowledge of Californian nudibranchs. 



