42 NOTES ON A COLLECTION OF CALIFORNIAN NUDIBRANCHS. 



to be formed by bundles of fibres and spicules anastomosing irregularly 

 within the transparent skin. The dorsal integuments also contain long inter- 

 secting spicules (fig. 5), straight or Y shaped, more rarely curved, and some- 

 times striated transversely. They are not visible externally, but can be seen 

 from the inside. 



The intestines are white or yellow, but the blood gland which is of a 

 deep purple contrasts markedly with its surroundings. It is single and irreg- 

 ularly lobed in outline. 'J'he eyes are very large and black ; the central 

 nervous system is concentrated as usual in Duridojiais, the different ganglia 

 not being distinguishable, except the buccal pair which are set far back on a 

 constriction of the oesophagus about 4 millim. from the rest. Some previous 

 investigator had opened the anterior portion of all the larger specimens, but 

 the arrangement of the buccal parts though disturbed seemed to be that 

 usual in the genus. The oesophagus is narrow, coiled several times, and di- 

 lates into a small spherical pouch just before it enters the liver. The latter 

 varies from chocolate to grey in colour, but in most specimens is hidden by 

 the yellow follicles of the hermaphrodite gland. It is deeply cleft behind. 

 The mucous gland is large and folliculate externally; it partially surrounds 

 the large spherical spermatotheca. The spermatocyst is elongate. The 

 ampulla of the hermaphrodite gland is sausage-shaped and very distinct. 

 The glans penis is thickly studded with hamate spines, resembling the teeth 

 of Dorids. 



It is possilile that this animal is Cooper's Doritf albo-punrtafa (Proc. Calif. 

 Acad. Nat. Sciences, 1863, vol. iii, pt. i), but the original type specimens 

 appear to be lost, and the description is so slight that it would hardly be 

 sufficient to identify any species. In some points (e.g. " surface shining, 

 minutely rugose ") it is not applicable to the present specimens, unless this 

 phrase is intended to refer to the underside of the mantle, which is not stated. 

 Otherwise, Cooper does not allude to the remarkrble reticulation, nor does 

 he say anything about the conspicous contrast between the white branchiae 

 and the colour of the dorsal surface 



Triopha, sp. 



One specimen from San Pedro which is much contracted and appears to 

 have lost both its natural shape and colour. As preserved, it is of a uniform 

 grey, 6 millim. long, 3.7 broad and 4 high. There arc 8 processes on the 

 frontal veil, and 5 on each side of the body, all low and stout, sub-divided 

 into short thick branches. The branchiae are six ; the rhinophore sheaths 

 straight and cylindrical about 1.5 high. The back is quite smooth, and no 

 tubercles are visible. 



The jaws are roughly triangular, and composed of short, thick rods of 

 varying shape. The radula is whitish and contains 25 complete rows as well 

 as a few broken ones. There are four rhachidian teeth, very transparent and 

 little developed. The two inner are squarish, the two outer are triangular. 



