180 REPORT ON THE NUDIBRANCHIATE 



but tlie dorsal tubercles were so cliaracteristically flattened tliat there 

 could be no mistake in the identification. 



4. GoNiODORis, Furhes. 



9. G. NODOSA, Montagu. 



Common on rocks between tide-marks in the Sound. In October 

 of last year it was obtained at the following localities — off Ram's 

 Cliff, north of Batten breakwater, at the east end of Drake^s Island, 

 one mile west of the Mewstone, and in the estuary of the Yealm. 

 This species, like many other Nudibranchs, comes to the shore in 

 the spring to spawn. Very many large ones were found on the rocks 

 below the Laboratory, near the ladies' bathing place, as early as 

 February this year, and the spawn was abundant in March, April, 

 and May. Young ones were being obtained frequently with the 

 dredge in July. 



10. G. CASTANEA, A. and H. 



One example, just an inch long, was obtained from the shore at 

 Bovisand, north of the pier, on May 31st of this year. Near it was 

 some spawn which corresponded generally with that described and 

 figured in Alder and Hancock, but the coil was larger and curiously 

 recurved so as to form a sort of figure 8. After finishing the third 

 round in one direction, the animal had begun again on the opposite 

 tack, depositing two coils. It was all in one piece, and probably was 

 deposited by this individual. 



5. Idalia, Leuckart. 



11. I. ASPERSA, A. and H. 



We have obtained two specimens of this rare species. The first 

 was dredged in the estuary of the Yealm on October 20th, 1888. 

 It is rather more than three sixteenths of an inch long in alcohol and 

 corresponds with Forbes's description of I. insequalis in having the 

 back '* circumscribed, elevated, with steep sides,^' a character which 

 may be exhibited by other individuals of this species aspersa (see Alder 

 and Hancock). It is colourless in spirit, has no median tubercles 

 or filaments on the back, and has the anterior gill-plume and the 

 posterior pair of filaments bifurcated. 



The second example was dredged off Penlee Point on June 29th 

 of this year. It was just over half an inch in length and its colour 



