ME. ALDER ON THE MOLLUSCA. 5 



great numbers, and a new Pycnogon, Nymphon rubrum (Hodge) 

 was captured on the Durham coast. Descriptions of these, as well 

 as of the other new species, will be found in the reports of the 

 sections to which they belong. 



Amongst Polyzoa Mr. Alder reports the following as being 

 new to the coast : Lepralia annulata and Tubulipora lobulata. 

 Bugula Murrayana was abundant, and appears to be pretty 

 nearly confined to the east coast. Among Hydrozoa the most 

 interesting captures were Tubiclava Cornucopia (a new form 

 lately described by Mr. Ebrman from specimens taken in Shet- 

 land), Plumularia myriophyllum, a rare species new to this coast, 

 and Salecium labrosum. 



Several fine sponges were obtained off Dunstanbro', but these 

 have not yet been completely examined. 



The lists of species in the various departments have been 

 tabulated, as far as possible, so as to present at a glance the 

 results obtained in each year. The captures of each year have 

 been also divided into two columns, in order to show separately 

 the species taken on the Durham and Northumberland coasts. 

 In 1862, however, no dredging was done on the Durham coast : 

 the second column is therefore occupied by the Dogger Bank, 

 which was not visited in the subsequent years. The occur- 

 rence of a species is noted with an asterisk. 



A synopsis of the various new and undescribed species will be 



found at the end of the report. 



G. S. B. 



Report on the Mollusca, by Joshua Alder. 



In reviewing the results of the tbree years' dredgings, now 

 brought to a close, we find that, so far as the Mollusca are con- 

 cerned, not much has been added to our previous knowledge, 

 though additional information concerning their distribution, and 

 the comparative abundance or rarity of the different species has 

 been obtained. One beautiful nudibranch, the Hero formosa of 

 Loven, has been added to the British Fauna, and four testaceous 

 gasteropods, Eulima nitida, JE. gracilis, Rissoa cimicoides, and 



