364 MOLLUSCA. 



posed than in B. rotifera, as figured by M.-Edwards, were -whitish ; others 

 disposed like B. rutifera were buff; others again disposed precisely like 

 B. rubrion were orange. Some tadpole-like larvae as figured by M.-Ed- 

 wards (pi. 4) were observed. 



B. rubrum has hitherto been recorded as found on the coast of Nor- 

 mandy (M.-Edwards) and at Falmouth (Alder) only. 



Genus Didemnum. 

 D. gelatinostirn, Edw. 

 Adherent to Serjnila tuhidaria dredged in Strangford Lough, Oct., 

 1839, &c., W. T. Dr. Scouler has met with it on the Irish coast. 



A species apparently of this genus may not uncommonly be found in- 

 vesting the stems of Halidrjis siliquosa. It is of a pale grey colour, and 

 may be said to give the plant the appearance of being besmeared with 

 bird-lime. 



* At the Glasgow meeting of the British Association for Science in 1840, I 

 brought forward a series of Dredging Papers, the first of which had been filled 

 up by my lamented friend, the late Professor Edw. Forbes, on the 11th of July, 

 184U, on which day he had visited me at Bangor, County Down, and joined in a 

 little dredging excursion, Mr. Hyndman and Mr. Thompson being our com- 

 panions. Some additional papers were filled up the succeeding year, and all 

 were placed in the hands of Prof. Forbes, who on more than one occasion pub- 

 licly referred to them. 



Under these circumstances it may seem strange that no mention is made of 

 my name in connexion with the list of Mollusca fomid in Belfast Bay, as now 

 given ; nor in that of other classes belonging to the Articidata and Radiata. 

 This may be explained by the fact, that when Prof. Forbes, in 1850, had com- 

 pleted one portion of his Report, he handed my Dredging Papers to Mr. Thomp- 

 son, by whom they were retained, in order to be used when the time for pre- 

 paring for press that portion of the Natural History of Ireland should arrive. 

 His premature death prevented that intention from being fulfilled; and those 

 Dredging Papers, still unused, were found among his Natural History MSS. 

 and handed to me along with them. 



All the species which I had enumerated had been recorded by Mr. Hynd- 

 man, Mr. Thompson, or other friends ; there seemed therefore no sufficient rea- 

 son for interpolating my name in the MSS. 



Robert Patterson. 



