298 Dr. K. Koehler on the Littoral Fauna of the 



Among the other groups of Arthropods I maj cite Pycno- 

 yunuiii littorale^ Strom, and Ammothea longipes^ Hodge, 

 wliich are pretty common on the coast of Jersey among Algai. 



I will also indicate a small mite, which is associated with 

 j^pus and ^pophiluSj and is perhaps a Halacarus. 



GUERNSEY. 



The island of Guernsey, situated to the north-west of 

 Jersey, has the form of a right-angled triangle, of which the 

 two sides of the right angle, corresponding to the eastern and 

 southern coasts, are about 7 miles long, while the hypotenuse, 

 which runs in a direction from south-west to north-east, is 

 rather more than 9 miles in length. The east coast, the two 

 extremities of which are St. Martin's Point in the south and 

 Fort Doyle in the north, is slightly excavated, and nearly in 

 its middle is situated the capital of the island, St. Pierre-du- 

 Port. 



The geological constitution of the island of Guernsey is very 

 different from that of Jersey. The syenite, which in Jersey 

 formed exposures of great extent, and which made its appear- 

 ance at almost all points of the coast (except at the north-east 

 and in St. Aubin's Bay), does not appear in Guernsey except 

 in the northern region of the island, and is replaced in the 

 south and south-east by gneisses associated with quartziferous 

 porphyries, and by por])hyrites, pegmatite, and some phyllades. 

 Syenite appears especially in the north-eastern and western 

 portions of the coast, and gives place in the north to consider- 

 able exposures of granite and diorite ; important quarries 

 are worked near St. Sampson and in the neighbourhood of 

 L'Ancresse Bay. 



It is to be remarked that in the regions where the coast is 

 lowest, that is to say throughout nearly the whole western 

 coast and the north-eastern half of the east coast as far as St. 

 Pierre, we meet with diorite and syenite ; but as soon as the 

 coast begins to rise, that is to say on quitting St. Pierre, 

 we see the gneisses and porphyries make their appearance 

 and continue throughout the southern half of the east coast 

 and the whole extent of the south coast of the island. 



The part of the corst situated between St. Pierre and Fort 

 Doyle is low, and the sea in retiring lays bare shores of con- 

 siderable extent, interspersed with rocks. It is in this portion 

 of the coast that is situated the port of St. Sampson, a small 

 village of fishermen, connected with St. Pierre by a steam 

 tramway ; then, further to the north, the port of Bordeaux. 



