new Crustacea from Devon and Cornioull. 289 



first pair of natatory legs the ])roxiinal joint of the inner 

 brandies is about equal to the entire lenglli of tiie outer, but 

 tlie second joint is only about half the len^tli of the third, 

 while the second and third joints are together about equal 

 to two thirds tlie length of tiie j)roxinial joint; the joints o£ 

 the outer branches are subequal. The next three pairs arc 

 siniih.ir to those in IStenhelia rejiexa. 



The fifth pair has the inner portion of tlie primary joint 

 produced into a narrow subtriangular phite, the bluntly 

 rounded apex of which reaches to about the middle of the 

 secondary joint; there are three seta? on the inner margin, 

 the upper two are short and subequal, the lower moderately 

 elongated ; tiiere are also two slender and moderately long 

 ajjical setaj of unequal length. The secondary joint is mode- 

 rately narrow and elongated, the breadth being scarcely half 

 the length ; it is broadest near the proximal end and tapers 

 gradually to the truncate and somewhat angular apex; a 

 h-mall seta springs from near the distal end of the inner 

 margin, two of moderate length from the truncate apex, and 

 three small ones from the lower half of the outer margin; 

 that one of these three wdiich is nearest the distal end is the 

 .smallest and is provided with a peculiarly thickened base. 



Ko uialesot tiiis species have been observed. The jieculiar 

 Ibrm and armature of the fifth pair of thoracic feet a[)pjar to 

 be ehaiacteristie of the species. 



The liircal joints in this species are short. 



Genus Paeasteniielia, I. C. Thompson & A. Scott, 1903. 



Parastenhelia anglica, sp. n. 



The genus Parastenhelia was instituted by T. C. Thompson 

 and Andrew Scott for two species wdiich, though having a 

 close resemblance to IStenhelia, ditfer in possessing nine- 

 jointed anteniiules, in the middle joint of the outer ramus of 

 llic antenna being nearly as long as the joint on eitlier side, 

 and in having the inner branches of the first natatory logs 

 two-jointed, the first joint being considerably longer than the 

 three-jointed outer branches. The form I have now to 

 describe agrees so closely with the typical species that I have 

 little hesitation in ascribing it to the same genus, even 

 though the inner branches of the first pair of legs be appa- 

 rently three-jointed. In this form the antennules are composed 

 of nine joints ; the first four are together equal to fully twice 

 the entire length of the other five, the second is considerably 



