NOTES ON A COLLECTION OF CALIFONL^N NUDllJRANCHS. 53 



tissue arranged in a loosely ramified fiocculent pattern. They also contain 

 large white cells and in some cases a few bands of purplish cells. 



The foot is as broad as the body (not divided transversely) somewhat 

 expanded in front and with a thickened anterior margiti. It extends a little 

 in front of the mouth which cannot be seen ventrally. The tail is pointed 

 but not very long. No oral tentacles couid be found. The rhinophores 

 are injured but appear to be pointed as in Hermaea. The pericardium is 

 not equally prominent in all specimens, but appears to be oval. 



The eyes are large and distinct : Ihe ganglia of the central nervous 

 system are granulate, but their arrangement could not be clearly seen. The 

 buccal mass is rather small, white and not striated. No sign of jaws or 

 crop could be seen. The number of teeth in the radula (fig. 22) varies 

 from 35 to 56. They are arranged in a spiral of about 4 coils, the used 

 teeth retaining their position and not falling into a heap. The size in- 

 creases rapidly going backwards. In the largest radula there are 4 rudi- 

 mentary teeth without a hook, 15 small, 12 moderately large, and 25 full 

 sized. All but the rudimentary teeth have a deep indentation in the back 

 and a spoon-shaped cavity at the end, across which runs longitudinally a 

 thin lamina bearing a row of numerous fine denticles. They closely re- 

 semble those oi Hm-maeina maculosa, Trinch. No armature could be found 

 in the reproductive organs. 



C. Eliot. 

 DESCRIPTION OF PLATES VII. & VIII. 



1. Tritonia palmcri. a. Median tooth, h. first lateral. 



2. „ ,, An ordinary lateral tooth. 



3. Acanthodoris rlioi/occras. Elements of labial amature. 



4- ,. „ „ Half a row of the radula. a. first lateral, h.—f. re- 



maining laterals. 



5. DoTidopsis irtuiilcila. Spicules. 



6. Dirona picta. A living specimen which has however lost most of its cerata. 

 7- ,• ,, Dorsal markings. 



8. ,, ,, One of the cerata. 



8a. ,, ,, Living animal, drawn by Prof. Mac Farland. 



9- n 1, Median tooth, a. from below, b. from side. 



10. „ „ First lateral. 



II- )) ), Second lateral. 



12. Janolus coendcopicUis. Living animal without cerata. 



13- n „ Two cerata. 



14- ., ,, Teeth near the rhachis. 



15- 11 II Teeth nearer the centre of the half row. 



16. „ „ Teeth nearer the end of the row. 



17. Hcnntsscnda opcdcscciis. Animal from above without cerata. 

 '''^- II „ Animal from below. 



19- .1 ., Two cerata. 



20. Pliyllobranchopis cutcromorpliae. From the side. 

 21- II „ ,, From above. 



22. „ „ ., Radula. 



