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DR DOUGLAS S ADDRESS. 



specinieus there, that these productious were merely different 

 states of one species. The Halisarca of Dujardin, perhaps the lowest 

 of animal organizations, was noticed in much abundance and perfection ; 

 and we could easily imagine, that, by the addition of siliceous spicula, 

 immersed and crossed in its texture, it might become the Halichondria 

 panicea of Fleming, which grew alongside of it in several varieties. — 

 Of the calcareous sponges, there were met with Grantia coriacea, hotry- 

 oides, foliacea, and a singular variety of G. ciUata. — Of Zoophytes, 

 Coryne sqiiamata, Laoinedea yelatinosa^ Sertularia pumila^ Lepralia coc- 

 cinea, Actmea mesemhr yanthemum, abounded, and in especial perfection 

 and beauty. — Of the Echinodermata, no other species than Echinus 

 esculentus, Ophiura fragilis and neglecta, occurred. The Bcliinus was 

 generally hidden by broken pieces of sea- weed, with which it covered 

 its shell. — Of the MoUusca tunicata, there were many species remark- 

 able for their beauty, but we can only specify the Ascidia rustica, 

 Phalliisea intestinalis, and Aplidium ficus, for of the others the names 

 could not with certainty be determined. The calcareous stones were 

 often found perforated with Pholas crispata, and one stone was found 

 by Captain Mitf ord, with many of the shells still living hidden in their 

 excavations. In one of these holes, a good specimen of Venus per for ans 

 was found ; and the Saxicava rugosa was not uncommon. A great 

 number of specimens of Lamellaria tentaculata of Montagu were taken, 

 shewing that the species is liable to considerable variation in colour, 

 and in the degree of roughness of the mantle. — Several very minute 

 individuals of the Boris tuberculata were taken up unnoticed, until after 

 our return home, and it is remarkable that in these, some of which 

 wer*' an eighth of an inch in length, there was no appearance of 

 branchiae. Another member of the family Doridae occurred, which is 

 without exception the most beautiful naked gasteropode we have seen ; 

 its name remains for future investigation. 



Passing from the Haven, the party next crossed over a formation of 

 limestone, consisting of three beds, from three to four feet each in 

 thickness, which, at the point to the eastward of the north sands, assume 

 a singularly undulated appearance. Mr Skafe has given a very brief 

 description of these, and a figure, illustrative of their undulations, in 

 Eaine's History of North Durham, p. 172. Thence we walked to the 

 Snook, to the spot where Mr Donaldson Selby is boring for coal. Here 

 the party separated, one division walking towards the village in as 

 direct a line as possible, that they might have leisure to examine the 

 Priory, Church, and Castle ; another set, bent on the murder of rabbits 

 and partridges, wandered over the links and fields in many a devious 

 track ; while a third set wandered leisurely round by the loch in search 

 of rarities in any class or kingdom of animality, but they were as 

 little successful as their murderous or sporting colleagues. At dinner 

 the party were reunited, and afterwards, as is our wont, the Secretary 



