52 NOTKS ON A COLT.KCTION OF CALIFORNIAN NUDIliRANCHS. 



This animal approaches very nearly Sj). neajmlitana which has a similar 

 coloration, large oral tentacles and transversely laminated rhinophores. 

 The teeth, however, and the front part of the foot present differences, and 

 in view of tlie habitat the probabilities are in favour of the species being 

 distinct. Hut the close resemblance between several Californian and 

 European nudibranchs is remarkable. 



Phyllobranehopsis, no v. gen. 



The specimens on which this new genus is founded are so badly pre- 

 served that many important characters remain uncertain. With the aid of 

 Mr. Cockerell's sketch however (figs. 20, 21) the following points can be 

 established. The radula is ascoglossan and closely resembles that of Her- 

 maeiiia, Trinch.; there are no jaws and no oral tentacles : the rhinophores 

 appear to be as in Hennaea : the margins of the back bear one or two rows 

 of flat leaf-like appendages, as in PhyUohranchus. The digestive system 

 and hepatic diverticula seem to be as in Hermaea and no trace of a buccal 

 crop can be found, though in view of the maceration of many of the in- 

 ternal organs, its absence cannot be regarded as conclusively demonstrated. 

 The vent could not be found. 



The animals offer many resemblances to CalipliyUa, but differ in (i) 

 their stouter shape, (2) the small number of cerata, (3) the radula, (4) the 

 arrangement of the hepatic diverticula in the cerata, and (5) the apparent 

 absence of the crop. It appears best to regard them as a new genus belong- 

 ing to the Hennaeidae, but in many ways intermediate between that family 

 an the Ph yUohranchidae. 



Phyllobranehopsis enteromorphae, gen. and spec. nov. 

 PI. viii, Figs. 20 — 22. 



Four specimens found on Enteromorpha in small rock pools near high 

 water mark or Dead Man's Island, San Pedro, July, 1901. The living 

 animals are desciibed as greenish yellow, with black mottlings on the sides. 

 The eyes were very distinct and set on small pale patches, the head and 

 and neck being black. The animals were about 5 millim, long. 



All the specimens are badly preserved and much macerated, so that it 

 is impossible to be certain about many of the most important external 

 characters. They are all greenish-white with an irregular black marbling, 

 distributed in varying proportions on the sides, head, tail and rhinophones, 

 but not on the foot or back. The cerata are whitish and flat as in PhyUo- 

 hranchus with sinuous but not denticulate edges. The largest are 2 millim. 

 long and i millim. wide. They appear to be arranged in a single row, but 

 large and very small cerata are sometimes found close together and may 

 represent two rows. They are easily caducous and many have fallen off. 

 Within them can be seen greyish, cells, only slightly darker than the surface 



