Anglo-Norman Islands. 293 



examples of ]\[ysis chamoiJeon, Tliomps., a species which is 

 exceedingly abundant among plants. M. vulgaris , Thomps., 

 accompanies it here sometimes ; but this is especially pelagic, 

 as is also the case with M. Griffithsice, Bell. Themisto hrevi- 

 spinosus^ Goods., is sometimes associated with Mi/sis chamce- 

 leon, but is not common. Mr. KSinel has also collected, with 

 the preceding species, some rare examples of Cynthia Fhm~ 

 ingii^i Goods., and of Thysanopoda Couchii^ Bell, specie3 

 which for my own part I never met with. 



The Stomatopoda are only represented by Squilla Desma- 

 restii, K.isso, which the fishermen sometimes bring in from 

 the open sea. 



Lastly, among the Cumaceoe I may cite Gastrosaccus 

 sanctus, Ben., Siihinoe serrata, Norm., and S. trispinosa, 

 Goods., which live among the Zosterce, but are rare, and 

 finally a small pelagic Cumacean, Ciuna Edwardsii^ Bell. 



Isopoda. 



The Tanaidina are not very abundant at Jersey. Tanais 

 vitfafus, Lillj., Leptochelia Edwardsii, Kroy., and Paratanais 

 forcipatus, Lillj., live among the Halichondria panicea and 

 Cynthiai which clothe the surface of the rocks ; Anceus maxil- 

 laris, Mont., and Praniza cmrulea^ Mont., are also found there. 

 Paranthura costata, Spence Bate, and Apseudes talpa, Leach, 

 are sometimes met with in similar situations. 



The true Isopoda are more generally distributed. Belong- 

 ing to the group of the Idoteoi we have /. tr{cusp)idata, Desm., 

 very common among sea- weeds, sometimes pelagic; /. linearis, 

 Linn., generally distributed, usually associated with the pre- 

 ceding, but at certain points much more frequent, as, for 

 example, at Elizabeth Castle ; /. acuminata, Leach, of which 

 I found a specimen at St. Aubin ; I. oppendicidata, Risso, 

 not very abundant, which 1 have found at La Mothe; 

 and, lastly, /. emarginata, Fab., which is always pelagic 

 and lives in the midst of floating sea- weeds. 

 ^ Among the Oniscidge the best-known type is Ligia oceanica, 

 Fab., which lives upon the rocks of the shore. The indi- 

 viduals are generally of very small size. Janir a maculosa, 

 Leach, is common under stones. Living among sponges and 

 beneath the tufts of Cynthia rustica I have also met with 

 Janirce of smaller dimensions and of which the inferior 

 antennae are comparatively much shorter than in the typical 

 J. maculosa. Delage also indicates a Janira with short 

 antenna at RoscofF. I do not think that we ought to ascribe 

 any importance to this character, for among these small 



