234 Dr. R. Kceliler on the Littoral Fauna of tlie 



tluivicans {Cucumaria) and once a >S/jafa7?9'2<5, probably tlirown 

 up by a gust of wind. At certain points the beach, covered 

 witli fine and shelly sands, presents numerous specimens of 

 Molgulfe [AmireUa roscovita). La Rocque is also a very 

 good station for Mollusca {Pholas dactylus is sometimes met 

 with there). 



From La Rocque to the Pointe de la Coupe the coast offers 

 no point of interest as regards the fauna, which is excessively 

 poor. We have in the first place the immense bay of Grou- 

 ville, stretching from La Rocque to Gorey, where the sea 

 leaves bare an immense uniform beach, presenting hardly any 

 naked rocks, and containing only a few very common Anne- 

 lides. The same conditions recur to the north of Gorey in 

 the bays of St. Catherine and Fliquet. 



The whole of the portion of coast included between St. 

 Helier and Gorey is almost exclusively formed of syenite, 

 which, at certain points in St. Clement's Bay, is replaced by 

 diorite. The geological constitution of the rocks changes on 

 leaving Gorey ; we meet, in fact, with chocolate-brown petro- 

 siliceous porphyries, which pass into pyromeride. These 

 brown portions are known in Jersey as rhyolites. At the 

 same time that the syenite disappears we see the coast gradu- 

 ally rise and present escarpments, which become more and 

 more elevated as we approach the Pointe de la Coupe. 



The southern region of the island presents, to the west of 

 St. Helier, two deep bays, the first and most extensive of 

 which is St. Aubin's Bay, and the other, smaller one, separated 

 from the preceding by a promontory which is terminated by the 

 Pointe de Noirmont, is the bay of St. Brelade. To the w^est 

 of the port of St. Helier, and opposite to its entrance, is 

 Elizabeth Castle, situated upon a rock rather more than 

 half a mile from the town. To the south of the castle are 

 some rocks forming the Hermitage. Between the castle 

 and the port there appear a series of small rocky islets, which 

 are all laid bare at low water and which sometimes give 

 shelter to interesting types. Thus one of these rocks, situated 

 close to the entrance of the port, harbours StenorJiynclms 

 cegyptiusy a new crustacean for the Channel. The rocks 

 forming the massif of the chateau are not very elevated 

 towards the north, that is to say towards St. Holier, but rise 

 higher on the other side, where they plunge perpendicularly 

 into the sea. They are formed, according to M. de Lappa- 

 rent, of a granitoid diabase of very beautiful grain, united 

 with a rose-coloured granite, of which it encloses angular 

 fragments. 



At the foot of the castle, between the fort and St. Helier, 



