496 A CORNISH FAUNA. 



Genus, Iphimedia. — Rathhe. 

 Beit. %ur Fauna, JSforw. 



Ceplialoii produced anteriorly. Eyes two, antennae simple. 

 Hands feeble, imperfectly subchelate. Telson squamose emarg- 

 inate. 



Iphemedia obesa. — Rathke. — L.c. nov act. Scop., vol. xx, p. 89, pi. 

 iii, fig. 1 ; Bate and Westwood, I.e., vol. i, p. 219. 



Dredged near Drake's Island, in Pljrmouth Sound. 



GrENUs, SiLGEBOEGiA. — Spence Bate. 

 Cat. Brit. Mus., p. 118. 



Cephalon but slightly produced. First pair of antennae short, 

 having a second appendage, hands large. Telson cleft. 

 SiLGEBOEGiA PALLIDA. — Spence Bate, Bate and Westwood, p. 203. 



Plymouth Sound. I have no doubt but that it is the same 

 species as Gammarus brevicornis of Bruzelius (Mem. on amphi- 

 poda of Skandinavia.) 



Genus, Is^a. — Milne Edioards. 



Hist, des Crust, t. iii, p. 26. 



First pair of antennae with secondary branch, hands subchelate, 

 all the legs smaller but subchelate. Telson cylindrical, single. 



Is^A MoNTAGUi. — 3Iilne JEdtvards, l.c. p. 16,pl.xix, fig. 11. — Bate 

 and Westwood, vol. i, p. 215. 

 I have frequently taken this species. 



GenuSj Uhothoe. — Dana. 

 Xj. S. JExpl. Exp., p. 920. 



Body scarcely compressed. Eyes apart. First pair of antennae 

 with secondary appendage. First two pair of feet subchelate. 

 Telson double. 



Ueothoe elegans. — Spence Bate. — Bate and Westwood, vol. i, 

 p. 200. 



This species is named from its having beautifully variegated 

 colours when alive. It was taken from some trawl refuse from 

 the neighbourhood of the Eddystone. 



It bears a generally close resemblance to U. irrostratus, which 

 Mr. Dana took in the Zooioo seas. Nor is this the only instance 



