GENEEA UEOTHOE AXD UEOTHOIDES. 25 



by the insertion of a spinule, the distal margin less broad, carrying a feathered cilium, 

 a spine, and one or two setules. 



Length. A quarter to a third of an inch. 



Localities. The specimen figured was taken with others of both sexes at Llanfairfechan 

 in North Wales, from the banks of little streams or pools left in the sands at low tide. 

 The species has also been obtained at Goodriugton, near Torquay, from the sand left 

 bare at low tide. The specimen to which Spence Bate gave the name hrevicornis was 

 taken at Tenby, a locality intermediate between the two just named, and presents such 

 differences from the description of the adult liere given as might be expected in an 

 example only a tenth of an inch long. Recently the species has been met with in 

 North Devon. 



[Ueothoe poucheti, Chevreux. 



1888. Urothoe Poucheti, Chevreux, Crust. Ampli. du littoral des Afores, Bull. Soc. Zool. de France, 

 t. xiii. Janvier 1888, p. .34. 



When this paper was sent to the Zoological Society, the type specimen of Urothoe 

 poucheti, which is at present unique, was being exhibited in the Pavilion de Monaco at 

 the Paris Exhibition. It has since been lent me through the kind instrumentality of 

 M. Chevreux, naturall}', however, without being available for dissection, which is almost 

 essential for a full and accurate account of a species in this genus. Under this restric- 

 tion the following brief notes were made upon it : — 



Eyes strikingly large and black, the specimen being a male. 



First gnathopods. The finger longer than in the second pair. 



Third per ceopods. The lower hinder angle of the first joint well rounded. The third 

 joint not broader than the second, and not strongly spined, but with long plumose 

 setae; the fourth joint not broader than the third; the finger long and slender, the 

 distal half serrate. 



Fourth perceojwds. The first joint having slender spines on the lower pare of the 

 front margin, and seven plumose setse within the wing ; the third joint longer than the 

 fourth, instead of shorter as in Urothoe elegans. 



Fiftli perceopods. Front margin of the first joint straight. 



Uropods. The first pair with the rami equal, slender, not quite so long as the 

 peduncle ; the second pair considerably smaller than the first, the rami equal, slender, 

 shorter than the peduncle ; the third pair with long rami reaching back beyond those 

 of the first pair. 



The postero-lateral corners of the third pleon-segment are slightly rounded, almost 

 rectangular. 



The species approaches Urothoe elegans, Spence Bate, and in regard to the third 

 pereeopods it much resembles Urothoe norvegica, Boeck ; but taking all the characters 



VOL. XIII. — PART I. No. 4. — January, 1891. e 



