OF PLYMOUTH AND THE ENGLISH CHANNEL. 



249 



Here at Plymouth it has only been found in two localities, viz. 

 Millbay Channel and the Eddystone Grounds. 



Specimens from the former locality make their appearance at rather 

 long intervals, so that it cannot be called common, and it seems to 

 frequent the chinks and crevices of the rocks which are found there, 

 the depth being about 25 fathoms. Only a single specimen has been 

 found on the Eddystone Grounds. This is considerably larger than the 

 Millbay forms. It measures some 3^ inches in length, and the dorsum 

 in the hinder part of the body bears three longitudinal rows of well- 

 developed tubercles. 



The Millbay specimens are small, barely two inches in length, and 

 give one the idea of being disproportionately narrower. The dorsum 

 is not tuberculated. In colour the specimens are approximately alike. 



Plymouth : Millbay Cliannel 



Eddystone Grounds 



Falnioutli 



Channel Islands 



Dinard 



St. Male 



St. Male, Eoseoff 

 Cotes de Bretagne 



Localities. 



Dredgings and on shore 

 With terebellids 



Himanthalia 

 zones 



and 



Allen (1). 

 Johnston (16). 

 Mcintosh (20). 

 de St. -Joseph (31). 

 Audouin et 



M.-Edwards (2). 

 Grube (12). 



Pruvot (29). 



* Halosydna gelatinosa, M. Sars. 



Not infrequently found on the shore under stones which' rest on a 

 basis, sometimes very scanty, of sandy mud, and occasionally in deep 

 water. It cannot be called an abundant species. Mcintosh (20) gives 

 it its habitat under stones and in crevices, laminarian roots between 

 tidemarks, and in the valves of old shells in deeper water. 



Pruvot (29) gives the habitat of this worm on the coast of Brittany 

 as the middle (Himanthalia) zone of tidal waters, and also his 

 laminarian zone among the Laminaria, which accords with its distri- 

 bution in the neighbourhood of Plymouth. 



Localities. 

 Plymouth : Rocks below Laboratory, Rum Bay, Mewstone Grounds, off Stoke Point 



(R. A. T.), AVembury Bay (R. A. T.), Drake's Island (R. A. T.). 

 Eddystone Grounds IX. Coarse gravel, with sand or mud Allen (1). 

 Channel Islands 



Dinard 



Roscoff . 



Cotes de Bretagne 



At lowest tides in the holes bored 

 in the mud by Nerine . 



Mcintosh (20), 

 Lankester (17). 



de St. -Joseph (31). 

 Grube (12). 



Himanthalia 

 zones 



and laminarian 



Pruvot (29). 



s 2 



