Dr Herdman on the Invertebrate Fauna of Lamlash Bay. 17 



I. Additional Notes on the Invertebrate Fanna of Lamlash 

 Bay. By W. A. Herdman, Esq., D. Sc. [Plate I.] 



(Read 15th December 1880.) 



The present communication deals with the greater portion 

 of the results of about thirty days' dredging during last 

 August and September in Lamlash Bay and its neighbour- 

 hood, and is supplemental to the paper on the Fauna of 

 Lamlash Bay which I had the honour of reading before this 

 Society last January. 



In referring to publications on the Fauna of Lamlash or 

 the neighbourhood in my previous paper, I omitted to mention 

 two works which I have since met with, viz., a series of papers 

 on the Mollusca of the Firth of Clyde, by the Eev. A. M. 

 Norman, which appeared in tlie Zoologist for 1857-60 ; and the 

 later edition of Dr Landsborough's "Arran" (1875), by his son 

 Mr David Landsborough, and which contains some natural 

 history lists, including the Nudibranchs found by Alder. 



This year I extended the area investigated considerably by 

 dredging down in front of Whiting Bay, and round the out- 

 side of Holy Isle. I am still of opinion, however, that the 

 most productive localities are at the north and south ends of 

 Holy Isle and along its western side, especially in the little 

 bay in front of St Molios' Cave. Here, at a distance of from 

 100 to 300 yards from the shore, and in a depth of 15 to 20 

 fathoms, the bottom is composed of small stones and dead 

 shells, often profusely covered with Zoophytes and Polyzoa. 

 A dredgeful of these never fails to yield something interest- 

 ing, such as Crania anomala, Trichotropis borealis, Lyonsia 

 noTvegica, Campanularia gigantea, Aglaophenia myriophyllum, 

 Sarcodictyon catenata, etc. In this part of the bay were also 

 obtained four species of Holothurians, the only ones I came 

 across. 



On the other hand, some of this year's "finds" were 

 dredged on the new ground — for example, Terebratula caput- 

 serpentis, Eulima polita, Froctonotns mucroniferus, etc., off the 

 east side of Holy Isle ; and Xylophaga dorsalis, Capulus hun- 

 garicus, and Goniodoris castanea off Whiting Bay. 



VOL VI. B 



