216 Clll'STACEA OF THE ( HAXXEL ISLANDS. 



PagruPUS Bernhardus, IJn. Common Hermit Crab. Abundant on all our 



sliores. The young ones occupy the sliells of Rissoas, I.ittorinas, Pur- 

 pura, &c., in loools up to high tide limit ; the adults the shells of whelks, 

 keeping to the lower zone and beyond. The full gro^\^^ crub is nearly 

 always accompanied by its commensal anemone yldamnia parasitim. 



Pagurus Prideauxii, Leach. Far less common than the last species, and 

 living at a lower zone. It more often occupies the shell of Trochiis maym 

 and Xatlca than the whelk, like the last it also carries a commensal 

 anemone, but of a different species, viz., Ada>nsia paUiata. 



Pagurus euanensis, Tkomp. More common than P. Prideauxii, but by no 

 means abundant. Usually occupies the shell of M/crcx, more rarely that 

 of Pui-pitra ; and generally found at the foot of rocks in oozy situations at 

 extreme low tide. 



PagUPUS Hyndmanni, Thomp. Frequent in all our bays, low down in tide 



range, on gravelly bottom, generally occupyilig the shell of Lit(ori/ia. 



POPeellana platyeheles, Pen. Abundant on all our rocky shores. 



POPeellana longieOPnis, Edw. Equally abundant from half-tide level to 

 the lowest zone. 



Galathea squamifepa, Peach. The commonest of this genus on our shores. 

 The local name for Galathea is " Pcreri'<se^'" which is misleading as this is 

 the French name for a very different crustacean, viz., the Freshwater 

 Crayfish f Astaeus fluviatHisJ which is found in rivers in England and on 

 the Continent. 



Galathea StPigOSa, Ffd)r. Rarely found between tide-marks, but frequent 

 fairly close inshore, and often taken in prawn pots. G-rows excep- 

 tionally large in these islands. 



Galathea nexa, EmU. Not uncommon off Corbiere Point, Jersey, and St. 

 Martin's Point, Guernsey, in 10 to 15 fathoms. 



Galathea intePmedia, LUl. Another species of Galathea, smaller than the 

 last, and of a light buff colour, is occasionally dredged in the localities 

 just named, and also off Herm. It is not described by Bell, and appears 

 to be referable to the G. itder media of some authorities. 



DPOmia VUlgapis, Edw. in 5 to 20 fathoms round the islands, but not 

 common. This crab is now proi:)erly placed among the Brachyura. A\^hy 

 it was ever (considered an Anomouran is not clear, for the reduced condi- 

 tion of the hinder legs is obviously due to the creature's habit of holding 

 (objects, usually sponges, over its back, to mask itself. The sponges often 

 attach themselves in this situation, and go on grooving. 



MACRURA. 



PalinUPUS quadPieOPnis, Fahr. Crawfish. More or less common in all 

 the islands (though less plentiful in Jersey than in the others) and largely 

 fished for market. Local name (Jersey and Guernsey) " (Jrahe a col,'''' or 

 Crab with a neck ; but the reason for this name is not apparent. 



SeyllaPUS aPCtuS, Fabr. A Mediterranean species with many affinities with 

 the last, and having a very similar larval form, viz., a PhyUosoma or 

 '' Glass Crab " stage, but tlie antenn* are represented by flat denticulated 

 leaf-like organs. Not rare off Guernsey, Sark and Herm, but only once 

 recorded, to my knowledge, from Jersey. Several specimens have been 

 taken off the Minquier Reef, south of Jersey. 



Callianassa SUbtePPanea, Leach. The most typical of the fossorial crus- 

 taceans, forming tunnels in sandy ground ten or twelve feet long, but 

 often making use of the burrows of large annelids when found on hard 

 ground. Not common between tide marks but must be plentiful beyond, 

 as after storms many of the harder parts of the animal are washed 

 ashore. 



