370 



NOTES ON SOME liRlTlSlI NUDIBRANCMS. 



together and only appear as minute serrulations. On page 21 of the 

 Appendix they create the genus Calma for Eolis ff lav coides, hut unfortu- 

 nately mention only the external characters and do not refer to the 

 anatomy. 



Hence Trincliese, followed hy Bergh {Beit, zur Kenni. dcr JEolid., 

 iii., 1870, pp. G43-7, and vii., 1882, pp. 61-4) and Vayssiere {Opisth. de 

 Marseille, ii., 1888, 84-8), regarded the genus as akin to Flabcllina, and 

 referred to it the JiJoiis cavolini of Verany. 



Later {Rcndiconti Accad. Set. Fis. Mat. di NapoH, xx. 5, 1881, pp. 121-2, 

 and Mem. Ac. Sci. Istit. di Bologna, S. iv. T. x. pp. 57-61) Trinchese 

 described under the name of Forestia mirabilis a Mediterranean iEolid 

 having all the main characters of Alder and Hancock's Calma glaucoides 

 — the thread-like undivided radula, the broad, simple hepatic system, 

 and the hermaphrodite gland arranged along the two sides of the body. 

 Friele and Hansen had also {Bidrag til Kundshahen om dc nordskc 

 Nudibranchier, 1875, pp. 78-9) described another species from the 

 Nortliern Atlantic, calling it merely Bolts albicans, but indicating its 

 affinities to the genus Calma, A. & H. Bergh, in his System dcr Nudib. 

 Gastcropoden(i). 1025 and p. 1034) puts Bolis albicans under Forestia, and 

 makes the genus Ccdma consist of C. glaucoides, A. & H , and C. cavolini 

 (Verany). 



There can, however, be little doubt that the really important charac- 

 ters of Calma are those mentioned above, and that the genus is equiva- 

 lent to tlie later (1881) Forestia. It will then contain three species, 

 j]. C. glaucoides, K. &, H. Atlantic. 

 ' 2. C. albicans, Friele and Hans. Atlantic. 

 3. C. mirabilis (Trinchese). Mediterranean. 



C. albicans appears closely allied to C. glaucoides. C. ■mirabilis differs 

 in having a few separate teeth, as well as the continuous chitinous band, 

 and it would seem that the groups of papilhii do not rise from a common 

 stalk. 



It seems probaljlc that Calma cavolini does not belong to this genus. 

 It is regarded by Bergh and Vayssiere as related to Flabellina, from 

 which it difTers in having no perfoliations on the rhinophores. The 

 radula is not like that of Calma glaucoides, but has separate teeth of 

 the usual pattern. There is some doubt wliether it is triseriate or 

 uniseriate, the laterals being in any case very small. It would seem 

 that in some points tlie digestive and reproductive organs resemble 

 those of C. glaucoides, but neither Bergh nor Vayssiere suggest that it 

 resembles Forestia mirabilis. They had perhaps not seen Trinchese's 

 paper at the time they wrote. Whatever may be the true allinities of 

 the form, the diflerences in the buccal parts prevent its being referred 

 to Calma, and 1 would propose that it should be rebaptized Ccdmclla. 



