

ramus rather small, biarticulate. Oral parts on the whole normal. 1st pair of 

 legs somewhat resembling in structure those in Thalestris, both raini being dis- 

 tinctly prehensile and subequal in length, armed at the tips with strong claw- 

 like spines. Natatory legs comparatively slender, with both rami 3-articulate, 

 the outer one being the longer; inner ramus of 2nd pair of legs in male trans- 

 formed in a similar manner to that in Thalestris. Last pair of legs with the 

 inner expansion of the proximal joint very broac 1 but only slightly projecting, 

 distal joint narrow, sub-falciform in shape, and extended laterally. 



Remarks. This genus was established in the year 1865 by Boeck, to 

 include a species found by him off the west coast of Norway. It was however 

 not accepted by Prof. Brady, who in his Monograph referred the species described 

 by Boeck to the genus Thalestris; and all subsequent British authors have fol- 

 lowed him in this view. True, one of the characters on which Boeck based his 

 genus, viz., the supposed duplicity of the eye, must be wholly cancelled, being 

 due to a miscomprehension; but there still remain several peculiarities which 

 seem to warrant the maintenance of this genus. In no other Thalestridse does 

 the body exhibit such a pronounced shield-like form, and -indeed, for this reason, 

 Glaus would certainly have referred the genus to his family Peltidiidas. Moreover 

 the structure of the 1st and last pair o f legs is somewhat different from that in 

 other ThalestridaB. Two closely-related species of this genus occur off the Nor- 

 wegian coast. 





86. Amenophia peltata, Boeck. 



(PI. LXXXIII, PI. LXXXIV, fig. 1). 



Amenophia peltata, Boeck, Oversigt over de ved Norges Kyster iagttagne Copepoder, Clir. Vi<l. 



Selsk. Forhandl. 1864, p. 269. 



Syn : TMlestris peltata, Brady. 



Specific Characters. Female. Body oblong oval in outline, about twice 

 as long as it is broad, the greatest width occurring somewhat in front of the 

 middle. Cephalic segment very large and expanded, slightly contracted, anteriorly, 

 front obtusely produced, lateral corners acuminate. Epimeral plates of the 3 

 succeeding segments extended laterally, and terminating behind in an acute point. 

 Last segment of metasome much narrower than the preceding ones. Urosorne 

 about half the length of the anterior division, and, like the latter, distinctly de- 

 pressed, genital segment twice as broad as it is long, and imperfectly divided in 

 the middle, lateral edges of this and the 2 succeeding segments densely ciliated. 



