CRUSTACEA OF THE CHAXXEL ISLANDS. 213 



subdivision Camacea, small and elusive forms, in which very 

 likely there will be many gaps. 



In the nomenclature and in the order of arrangement I 

 shall chiefly follow BelFs British Stalh-eyed Crustacea^ and 

 Spence Bate and Westwood's British Sessile-eyed Crustacea. 

 In the last section however I shall not do more than allude to 

 some of the common, or in some way interesting, species which 

 happen to be known to me. 



The books above named are now somewhat antiquated, 

 but they still remain our best standard works on the subject, 

 and are readily accessible to the young naturalist who desires 

 to commence the study of the Crustacea. Much additional 

 information on the subject will be found in Sars' Crustacea of 

 jVoncay, Norman and Scott's Crustacea of Devon aud, Corn- 

 ivaJl, and other works of that kind, which have appeared within 

 the last few years. But the l)ooks 1 have mentioned are the 

 best ones for the young beginner to start with. 



As a bai-e list of names is always uninteresting, I have 

 thought it best to append to each species a few brief notes to 

 assist intending students or collectors of the Crustacea of our 

 coasts. 



I.-STALK-EYED CRUSTACEA. 

 BRACHYURA. 



Stenorhynehus phalangfium, Fen Long^-legged Spider Crab. Fairly 

 common from half-tide limit to low water. It very effectively masks 

 itself by attaching fragments of seaweed to the hookecl bristles with which 

 it is clothed, and so often escapes notice. 



Stenorhynehus tenuiPOStris, Leach. Slender Spider Crab. Rather larger 

 than the last and much less common. 



Stenorhynehus Egyptius, Edw. The most abundant of the genus in the 

 Channel Islands. 



Aehseus Cranehii, Leach. Generally considered very rare, and certainly 

 not common, although its peculiar habits may account for the few records 

 we have of its occurrence. By means of its large posterior claws it sus- 

 pends itself to ascidians, sponges, polyzoa, &c., on the under side of raised 

 boulders, and being clothed with a heavy dress of seaweed fragments, it 

 easily eludes observation. 



Inaehus dorhynehus, X^^/(^7^ Common on all oar rocky shores. The crabs 

 of this genus resemble the preceding ones, but are of stouter build. They 

 do not decorate themselves with weeds, &c., but are usually encrusted 

 with a thin layer of growing sponges. They live mostly at the foot of 

 rocks on oozy ground low down in tide range. 



Inaehus dorsettensis, Leach. Much less common than the last species. 



Inaehus leptoehirus, Leach. Rare. The only locality where I have taken 

 it was off St. Martin's Point, Guernsey, in about 15 fathoms. 



Pisa tetraodon, Leach. Four-horned Spider Crab. Common on all our 

 rocky coasts. 



Pisa Gibbsii, Leach. Frequents deeper water than P. tetraodon, and is far 

 less common. Almost invariably coated with a growth of sponge. 



