382 SIR C. ELIOT ON NUDIBRANCHS [Mar. 1, 



The following is a list of the forms noticed below : — 



Ghromodoris A. & H. 



1. Chr. retictdata Pse. 



2. Chr. syhesi. 



3. Chr. cavce. 



4. Chr. annulata. 



5. Chr. splendens. 



6. Chr. tryoiii (Gar.). 



7. Chr. vicina. 



8. Chr. elizabethina B., var. africmia. 



9. C7w. runcinata B. 



10. C^?'. tiigrostriata. 



11. CA?'. scuri'a B. 



12. C'Ar. Ma?-is B. 



13. CAr. Uneata Souleyet. 



14. ,, ,, var. nigroUneata. 



15. Chr. ? magnifica Q. & G. 



16. Chr. inconspicua. 



17. Chr.flava. 



Casella H. & A. Adams. 



18. Cas. atromarginata (Cuv.). 



Ceratosortia Adams & Reeve. 



19. Cer. cornigerum (Ad.). 



Sphcerodoris B. 



20. Sph. Icevis B. 



Or odor is B. 1 



21. 0. tniamirana^. I (Fi'om Willey's New Britain 



Miamira B. | Collection.) 



22. Mia. nohilis B. J 



Genus Ghromodoris. 



More than 100 forms are referi-ed to this large genus, but are 

 by no means all equally certain. About 40 have been described 

 by Prof. Bergh, and may be regarded as well established. Most 

 of the remainder are known only from the external characteristics 

 often very superficially described, and many of the so-called species 

 are probably merely varieties. 



The animals are as a rule soft, smooth, and brightly coloured. 

 The branchiae are simply pinnate, the tentacles small and capable 

 of retraction. There is a strong labial armature and a charac- 

 teristic radula. The rhachis often bears thickenings : the first 

 tooth on each side of it is denticulate on both the inner and outer 

 sides, and thereby difiers from the rest, which are denticulate on 

 the outer side only. The outermost are irregular and denticulate 

 on the apex only. There is no stomach outside the liver. 



Within the limits of these characters there is such great 

 vaiiety that it may be doubted if the genus should not be split up. 



