■7i 



MARINE MOLLUSCA OF SANDSEND, 

 YORKSHIRE. 



Miss M. V. LEBOUR. 

 Radcliffe House, Corbridge-on-Tyn^, Northumberland, 



The following- notes were made during- a five weeks' stay at 

 Sandsend in igoi. All the species mentioned below were found 

 quite near the village and within tide-marks. Very few were ever 

 thrown up on the beach, the masses of pebbles scattered about 

 breaking nearly all those of a fair size. Therefore, with a few 

 exceptions, those species not collected alive on the rocks were 

 minute shells in small patches of shell sand. 



GASTEROPODA. 

 Fam. DORIDJE. 



Doris tuberculata (Cuvier). One very fine specimen under 

 a stone among the rocks at spring--tide. 



Doris bilamellata. (L. ). Profusely covering a large rock only 

 uncovered at spring-tides. This species was spawning in 

 the middle of August. The delicate white spawn was all 

 over the rock and the stones near. 



Doris aspera (A.&H.). Very common under stones among the 

 rocks between tide -marks, both white and pale yellow, 

 the former being more common. 



Doris johnstoni (A.&H.). Two fine specimens with the 

 sponge Hcilichondria panicea (Johnston), which it so closely 

 resembled that I very nearly passed.it over. The branchial 

 cavity was exactly like one of the oscula of the sponge, and 

 the colour and what few markings there were, also the same. 

 Both were yellowish-white, with a few minute darker spots. 

 I do not know the characters of this sponge sufficiently to 

 venture to give an opinion as to this being a case ot 

 mimicry. Certainly the facts are sugg'estive. 



Fam. POLYCERID^. 



Poiycera quadrilineata (Mi'iller). Common on Delesseria 



sanguined at spring-tides in shallow rock pools. 1 hese 

 were spawning" from the end of July to the beginning ot 

 September. 



1902 May 1. 



