112 



and boldly vaulted cephalic segment giving the animal in that situation a very 

 extraneous appearance. The specimen, though fully adult, did not exceed 

 a length of 0.40 mm. 



Gen. Pseudomolgus, G. O. Sars. 

 89. Pseudomolgus arenicola, Brady. 



(PI. LXXIV). 



Licfi.omolgus arenicolns, Brady, Monogr. of British Copepoda, Part III, p, 46, PI. LXXXVIII, 



figs 17. 



Specific Characters. Female. General form of body very like that in 

 P. leptostylis G. O. Sars 1 ), though perhaps a little less slender, with the 

 anterior division more regularly oval in outline, the greatest width occurring 

 in the middle. Head very distinctly defined from the 1st trunkal segment and 

 narrowly truncated at the extremity. Last trunkal segment remarkably narrow 

 and elongated. Tail about equalling in length the head and 1st trunkal 

 segment combined; genital segment fusiform in shape and distinctly subdivided 

 in the middle by a transverse dorsal suture; anal segment only slightly longer 

 than the preceding segment. Caudal rami much shorter than in P. leptostylis, 

 not nearly attaining the length of the 2 preceding segments combined, and 

 about of equal width throughout. Anterior antennae rather slender and, as in 

 the 2 other species, composed of 7 joints, the somewhat oblique suture between 

 the last 2 joint being distinctly marked. Posterior antennae very powerful, and 

 agreeing both in form and armature with those in P. leptostylis. Anterior 

 lip deeply insinuated in the middle. Maxillae with the 2 proximal denticles of 

 the principal masticatory lappet somewhat lamellar in shape, their inner sharpened 

 edge being divided into 3 or 4 fine spinules; palp of a somewhat irregular 

 form, and having in the middle of the rounded extremity a well-marked narrow 

 incision. Maxillipeds and legs almost exactly as in P. leptostylis. 



Body semipelluced, of a uniform whitish grey colour, with darker 

 translucent ovaria. Eye well observable, with light reddish pigment. 



Length of the specimen examined 1.60 mm. 



Remarks. I cannot doubt that the above-described form is identical 

 with the British species recorded by Brady and by Scott, though the description- 

 and figures given by those authors do not fully agree with those here given. 

 The species is indeed still more closely, allied to P. leptostylis than I had 



!) See Vol. VI, p. 182, PI. GUI. 



