LETTER OF PROF. EDWARD FORBES. 157 



order in some measure to deserve the title I send you one 

 or two notices of some additions I have lately made to 

 the Fauna of the Irish Sea. 



The first is a new species of a genus of Mollusca as 

 yet unrecognised by British Naturalists, namely the genus 

 Euplocamus of Phillippi, although one species (perhaps 

 identical with the Doris clavigera of Muller) has been 

 described and figured by Dr. Johnston of Berwick in the 

 Magazine of Natural History. The genus forms a con- 

 necting link between Doris and Tritonia, having the 

 dorsal branchiae of the former combined with the lateral 

 branchiae of the latter. My species differs from those 

 described in colour (white with yellow-tipped branchiae 

 and tubercles) and in the number of branchiae, which are 

 fewer, both dorsally and laterally. It is a little animal 

 about one quarter of an inch long, and was obtained by 

 dredging on the east coast of the Isle of Man in Sep- 

 tember. 



Secondly, I may mention the occurrence of the Tritonia 

 pinnatifida and Doris nodosa on the Manx coasts, also of 

 the Lamellar ia tentaculata, the two latter at low water, 

 the former in 20 fathoms. 



The following list of Manx Asteriadae may interest, as 

 no catalogue has hitherto been published : — 



Asterias templetoni — a species as yet undescribed — A. 

 gibbosus, A. glacialis, A. endeca, A. hispida of Pennant 

 (rubens of Fleming), A. rubens of Fleming (not of John- 

 ston), A. oculata, A. papposa, A. aranciaca, A. spinosus ; 

 Ophiura lacertosa, 0., a species allied to lacertosa but 

 much larger — undescribed as British, 0. bellis, 0. granu- 

 lata, 0. rosula, 0. neglecta, 0. minuta, Pennant ? ; Coma- 

 tula rosacea. 



A valve of Pandora obtusa and several specimens of 



