MOLLUSC A OF PLYMOUTH SOUND. 195 



racteristic was a beautiful opalescent pale blue colouring on tbe back 

 of the head between the oral and dorsal tentacles, on the inner faces 

 of the oral tentacles, and on the anterior faces of the larger branchial 

 papillae. On the posterior faces of the branchiae this colour became 

 more pink than blue. It was also made out slightly along the back 

 and markedly on the back of the foot or " tail." Here at the very 

 extremity it merged into a patch of the ordinary opaque white spots. 

 The individual lived very well in a dish for several days, but an acci- 

 dent very unfortunately prevented me from examining the radula. 



I know of no species to which this remarkable little Eolid can be 

 referred ; if it should prove to be new I would suggest for the species 

 the name Eolis Huxleyi, in honour of the President of our Association. 



21. Galvina, Alder and Hancoch. 



33. G. ciNGULATA, A. and II. 



We have obtained this species on two occasions. On June 11th 

 one specimen was dredged in twenty fathoms three miles south of 

 the Mewstone. It was not quite three eighths of an inch long and 

 possessed nine rows of hranchise. The lateral lines of olive-brown 

 between the bases of the papillge were broad and well marked. The 

 tentacles were pale in colour, and there was no patch of pigment 

 behind. The animal was very active and restless. 



On August 7th another specimen was obtained from the estuary 

 of the Yealm. When fully extended it was very slender and mea- 

 sured just over three eighths of an inch, but it possessed only Jive 

 rows of papillse. The olive-brown pigment was diffuse at the sides 

 and did not form distinctly marked lateral lines. The ring of 

 bright red colour on each of the tentacles shown in Hancock's figures 

 was represented by a band of reddish brown in this individual. The 

 papillae often assumed a contracted and tuberculated state^ such as 

 is persistent in the genus Doto. 



22. Tergipes, Cuvier. 



34. T. despecta, Johnston. 



Large numbers of these minute Eolids were found crawling about 

 on the hydrosomes of extensive colonies of Ohelia geniculata growing 

 on Laminaria saccharina from off the Mewstone on March 28th of 

 this year. The majority were transparent and quite colourless, 

 having simply an opaque white mass at the tip of each papilla. The 

 dorsal tentacles were constantly long and slender, while the oral 

 tentacles in some individuals could barely be made out at all. The 

 papillae were slender and not very club-shaped ; they were, as usual. 



