NOTES ON A COLLECTION OF CALIFORNIAN NUDIBRANCHS. 49 



The single preserved specimen is stoutly built. It measures 7 niillim 

 from head to tail, hut this represents at least 10 millim., as the body is con 

 siderably bent. The height is 4 millim., the l)re;ulth 3.5 across the back 

 and 5 c cross the foot. The buccal mass is exserted and the anterior end of 

 the animal somewhat distorted, but there appears to have been a fold over 

 the mouth with a distinct cylindrical tentacle on each side. Behind this are 

 the rhinophores, large, stout, almost spherical, 2 millim. high, withal)Out 15 

 deep perfoliations and slight cavities not amounting to pockets at their bases. 

 Between them is a crest which may be described either as two tubercles, or 

 one tubercle indented in the middle. The body liears at present only a 

 single line of minute cerata, which are evidently in the first stage of growth. 

 There are 25 — 30 on each side, and about six in front of the rhinophores. 

 Loose in the bottle are five stoutish conical cerata 3.5 long, with a yellow 

 ring below the tip. Their outline is rather irregular but they do not bear 

 distinct knobs. I have seen living specimens of ^?z/;o/>e//ar/-i,s/'ai'a at Plymouth 

 in a similar condition. In the Janidae the cerata are very caducous and easily 

 iost but also easily renewed. It is probable that the present animal in its 

 perfect state was covered with cerata similar to the large ones now detached. 



The anal papilla is large and cup-like, medio-dorsal and behind the 

 pericardium. The genital orifices are far back and surrounded by moderately 

 strong folds. The verge is exserted, very long, nearly 4 millim., conical but 

 sinuous, pointed but unarmed. The foot is broad, straight in front ; no notch 

 or groove is visible, but it was perhaps connected with the lateral expansions 

 of the head, though it is hard to tell from the preserved sj)ecimen. The 

 lateral margins of the foot are ample and undulated. The tail is not long. 



'l"he buccal mass is long and rather compressed. Its sides are enclosed 

 by the yellow jaws. They are very large for the size of the animal (length 3.5, 

 breadth 1.7), triangular, with a ridge down the middle of each side, and 

 striated. The edge is not denticulate, but presents a minutely tessellated 

 appearance near the hinges. The radula consists of sixteen rows, and the 

 maximum formula appears to be 16x27. i. 27. The teeth are transparent, 

 much bent and crowded, especially near the rhachis. It is probable- that 

 there is a median tooth in all the rows, but owing to the crowding and ir- 

 regularity of the other teeth it is often impossible to discover it. The teeth 

 are stout, low and hamate near the centre of the rows (figs. 14, 15), and have 

 long bases. Further from the rhachis they become taller, more slender with 

 smaller bases and more erect (fig. t6), only the outermost being again shoit. 

 On a few teeth near the rhachis can be seen 3 — 4 small ridge-like dentacles 

 quite at the base of the hook. The remaining teeth are smooth. 



'{"he internal organs aie not well preserved. The alimentary tract could 

 not be .satisfactorily traced, but as far as it could be followed seemed to corres- 

 pond with the descriptions of AntiopeUa cristata. The cerata contain yellowish 

 diverticula which bear two or three knobs or branches at the tips, where the 

 yellow rings are visiljle externally. The hermaphrodite gland is large,'and 



