MOLLUSCA OF PLYMOUTH. 431 



The largest individual was observed on one occasion^ after irrita- 

 tion, to contract itself vigorously from side to side ; but it did not 

 actually progress in this way. 



These new specimens of Lomanotus throw considerable light upon 

 the question of the number of species. There can be no doubt that 

 they ai-e members, with L. jiavidus, L. Eisigii, L. Portlandicus, and 

 L. Hancocki, of one and the same species ; and the largest of the 

 three specimens described in the previous Report so plainly connects 

 L. Eisigii with L. marmoratus, and this latter through our two 

 other specimens is brought so near to L. genei, that I have very 

 little hesitation in referring all the known forms to the species 

 L. genei possessing the characters of the genus. 



These specimens will form the material for some notes upon the 

 anatomy of the genus at no distant date. 



i^am7^— DOTONID^. 

 16. DoTO, Oken. 



18. '^DoTO FRAGiLis, Forhes. 



This species has been frequently taken as before. 



19. DoTO piNNATiFiDA, Moiitagu. 



I am glad to be able to add this rare species to the fauna. Two 

 specimens, f inch long, were dredged by Dr. Benham adhering to 

 Antennularia antennina on the Queen^s Grounds, opposite Picklecombe 

 Fort, in August. One had eight, the other nine pairs of cerata. 

 I carefully examined these specimens, and the colour and structure 

 were in every respect as desci'ibed by Alder and Hancock. On the 

 stem of the Hydroid was some Doto spawn, no doubt deposited by 

 one of these individuals. It was of a pale rose-pink colour, and 

 arranged on the stem in a regularly zigzag line, as is often the 

 case with the spawn of B. coronata. 



20. "^DoTO CORONATA, Gmelin. 



Prof. Herdman^ finds this species at Hilbre Island " invariably 

 creeping on the under surfaces of ledges and stones on which are 

 large colonies of the zoophyte Clava multicoriiis ;" and in these con- 

 ditions the molluscs are efiiciently concealed, on account of the re- 



' Herdman, On the Structure and Function of the Dorsal Papillce in Nudibranchiata, 

 Report Brit. Assoc, 1889, Sect. D, and Quart. Journ. Micr. Sci., xxxi, p. 56. 



