Anglo-Norman Islands. 299 



Between St. Pierre and St. Sampson the coast forms a very 

 extensive but not deep bay, called Belgrave Bay. This bay, 

 occupied partly by Zosterce and partly by rocks clothed with 

 sea-weeds, presents a tolerably varied fauna. The Zosterce 

 give shelter to some sponges {Leucosolem'a hotrylloides and 

 Isodictya fucorum) ^ small Crustacea [Mysis^ Themisto, Qastro- 

 saccus), Planarias, compound Ascidia, and a few Nudibrancha 

 (Doris tuhercidata^ Eolis papillosa). Under the rocks live 

 some interesting species of sponges {Halichondria incrustans, 

 Oplifosjwngia j^'^'l^dlafa, Isodictya cinerea, Hymeniacidon 

 viammeata) and Polychajta. In Belgrave Bay I have also 

 found at the limit of the lowest tides fine specimens of a Lep- 

 toclinumj the very thick corms of which are of a brilliant 

 red colour, and which I refer to L. Lacazii, Giard. 



Towards Bordeaux and over the whole portion which 

 extends between that little port and the Homptol rock (below 

 Fort Doyle) the coast is exceedingly interesting to explore, 

 and it presents a fauna of great variety although in a rather 

 restricted space. Certain regions are occupied by Zosterm 

 which shelter their usual fauna ; other points present small 

 sandy beaches traversed by rivulets, in which are found 

 Sagartia hellis and parasitica and Bv nodes gemmacea. Lastly, 

 under the rocks and under stones incvusted with calcare- 

 ous Algoe there live a number of not very common species. 

 Sea-Urchins, ComaUdm^ Ophiurans, and Asterias glacialis 

 are abundant there. I have found several specimens of Mol- 

 gula socialisj Cynthia sulcatula, Ascidiella scabra, Clavelina 

 lepadiformis^ Chadopterus Quatrefagesii, Edwardsia calli- 

 Tnorpha, Caryophyllia Smithii, &c., and several calcareous 

 sponges — Grantia ensata, Sycon tessellatuni, Leucosolenia 

 lacunosa, &c. This region of the coast, which extends to the 

 north of Bordeaux, is certainly the one the exploration of 

 which was most profitable to me. 



The west coast of the island is likewise but little inclined ; 

 it is broken by several irregular bays, presenting at low water 

 beaches of considerable extent sprinkled with rocks, which are 

 not so high in the northern region, where they are composed 

 of diorite, as in the south, where the diorite gives place to 

 syenite. Among these bays the most important are L'An- 

 cresse Bay, which looks towards the north, then the Grand 

 Havre, and the bays of Pecqueri^s, Cobo, Vazon, and Perelle, 

 turned towards the north-west; it is beyond Cobo Bay that 

 the syenite appears. Finally, Rocquaine Bay, the longest, 

 which looks to the west, teiminates this series of small gulfs ; 

 it extends from La Ree tower, opposite to which is the island 

 of Lihou, to which one can go dryshod at low water, to 



20* 



