NOTES ON SOME BRITISH NUDIRRANCHS. 359 



The cerata look less thick than in Alder and Hancock's plate. 

 They are slender and cylindrical, but often irregularly constricted near 

 the tips, as if injured. The last two are set medianly on the caudal 

 ridge. The anus is lateral, but high up. The tail not long. 



The body is transparent and colourless, with only a very little opaque 

 white on the oral tentacles and rhinophores. The hepatic ramifications 

 within the cerata are of a bright, light scarlet, and somewhat irregular 

 iu outline. Above the scarlet is a broad opaque white ring, and above 

 that a pellucid point. There is a faint yellow tinge in the rhinophores 

 and down the centre of the back. 



The jaws bear eight to nine rows of irregular denticles. The radula 

 consists of thirteen rows. The median tooth has a strong central cusp, 

 and seven rather long and thin denticles, curving slightly inwards. 

 The side teeth bear twelve longish slightly curved denticles. Alder 

 and Hancock {Tongues of the Eolidida') say that the apex of the side 

 teeth points outwards, but this did not seem to be the natural position 

 in the present specimen, though the teeth are easily displaced. 



In spite of this and some other small points of difference, I think 

 this specimen must be referred to C. rujihranchialis. It can liardly be 

 C. pclluclda, which it also resembles, as tliat animal is said to have 

 smooth lateral teeth. 



CORYPHELLA GRACILIS (A. & lb). 



One living specimen, Plymouth, April, 1905, G mm. long, and ratlier 

 elongate. The body is of a not very transparent white, with a good 

 deal of opaque white, especially on the oral tentacles, rhinophores, and 

 tail. The cerata have opaque white pigment at the top, which some- 

 times, but not always, forms a distinct ring. The liepatic diverticula are 

 of a reddish orange. The anterior angles of the foot are produced, but 

 are not very long. The oral tentacles are distinctly longer than the 

 rhinophores, which are smooth. The cerata are rather thick and 

 elliptical, and are set iu four groups, containing on each side eight, five, 

 five, and three cerata respectively. 



The radula consists of eleven teeth. Tiie central tooth bears four to 

 six (generally five) denticles on each side of the median cusp. The 

 laterals bear six denticles. 



This appears lo Ite a fairly typical specimen of (■. gracilis. Alder 

 and Hancock say it has four denticles on the central tooth, Bergh that 

 it has five. 



Another living specimen seen at Tlymouth at the same time was 

 9 mm. long and 2;") broad. It was very active, and fond of swimming 

 foot uppermost. 



The tail is long ; the anterior angles of tlie foot are produced into 



