266 



characters refers to the rostral plate, which does not as usual form the immediate 

 continuation of the cephalic segment, but, as in Normanella, is sharply defined 

 from it at the base by a well-marked transverse suture. The second character 

 is found in the structure of the 1st pair of legs, the inner ramus of which has 

 attached inside the proximal joint a short, though well defined plumose seta, of 

 which no trace is found in other Laophontidce, except in 'the genus Normanella, 

 We only know as yet a single species of the present genus. 



176. Laophontopsis lamellifera (Glaus). 



(PL CLXXXV). 

 Cleta lamellifera, Claus, Die freilebenden Copepoden, p. 123, PI. XV, figs. 2124. 



Specific Characters. Female. Body narrow and elongated, slightly tapered 

 behind, with the segments somewhat raised dorsally and fringed at the hind edge 

 with distant spinules. Eostral plate broadly triangular in form, tip obtusely 

 rounded. Urosome about the length of the anterior division, lateral expansions 

 obsolete, last segment fully as long as the preceding one, anal opercle finely den- 

 ticulate. Caudal rami twice the length of the anal segment and closely juxtaposed, 

 tapering somewhat distally, outer edge with 2 distant bristles, dorsal seta issuing 

 close to the base, middle apical seta scarcely half the length of the ramus. 

 the other 2 still smaller. Anterior antennae short and stout, composed of 4 

 joints only, the last 2 of the proximal part, and all of the terminal part, being 

 confluent; setae of the anterior edge comparatively short, partly spiniform. Posterior 

 antennae of quite normal structure. 1st pair of legs with the outer ramus 3-arti- 

 culate and about half the length of the proximal joint of the inner, plumose seta 

 of the latter very small, and attached about in the middle. Natatory legs with 

 the terminal joint of the outer ramus very narrow, and provided in the anterior 

 pair with one, in the other 2 pairs with 2 setae inside; inner ramus in 2nd pair 

 of legs with only 3 setae, in the other 2 pairs with 4. Last pair of legs with the 

 distal joint narrow linear in form, and provided with 6 partly spiniform seta?, 4 

 of which are attached to the outer edge, apical seta much the longest; inner ex- 

 pansion of proximal joint narrow linguiform, and extending considerably beyond 

 the middle of the distal joint, marginal setae 5 in number, the innermost one 

 somewhat remote from the others. Ovisac of moderate size and oval in form. 



Male not examined. 



Colour whitish grey. 



Length of adult female 0.88 mm 



