347 



Gen. 83. BalaenOpMlUS, Aurivillius, 1879. 



Generic Characters. Body narrow and elongated, with the segments 

 sharply marked off from each other by distinct constrictions. Cephalic segment 

 produced in front to a conical rostrum. The 3 succeeding segments without any 

 distinct epimeral plates. Genital segment in female not subdivided. Caudal rami 

 of moderate size, each with only a single apical seta. Anterior antennae slender, 

 9-articulate, tapering distally, and only sparingly setous, 5th joint with a short sensory 

 appendage; those in male comparatively larger and slightly prehensile. Posterior 

 antenna with the proximal joint undivided, outer ramus small, uniarticulate. Man- 

 dibles with the palp quite rudimentary, knob-like. Maxillae without any distinct 

 exopodal or epipodal lobes. Anterior maxillipeds comparatively small, with only 

 2 setiferous processes inside the claw-bearing joint. Posterior maxillipeds well 

 developed, terminating in a strong clawed hand. 1st pair of legs with the basal 

 part much prolonged, both rami 3-articulate, but rather unequal, the inner one 

 being much the longer, each ramus armed at the tip with 2 curved claws of un- 

 equal size. The 3 succeeding pairs with the outer ramus well developed, 3-arti- 

 culate, inner ramus much shorter and composed in the 2nd pair of 2 joints, in 

 the 2 other pairs of a single joint only. Last pair of legs with the distal joint 

 imperfectly defined from the proximal one. 2 ovisacs present in female. 



Remarks. This genus was established in the year 1879 by Dr. Aurivillius, 

 to include a peculiar Copepod found by him on the baleen of the great blue 

 whale (Balsenoptera sibbaldi). Only the type species is as yet known. 



221. Balaenophilus unisetis, Auriv. 



(PI. CCXXIX & CCXXX). 

 Balcenophilus unisetus, Aurivillius, Academical treatise with 3 plates. 



Specific Characters. Female. Body very slender and slightly constricted 

 in the middle, with the anterior division scarcely wider than the posterior. 

 Cephalic segment about the length of the 3 succeeding segments combined, and 

 considerably vaulted dorsally, rostral projection of moderate size and obtusely 

 pointed at the end. Urosome nearly as long as the anterior division and without 

 any spinules at the posterior edge of the segments, genital segment comparatively 

 large and somewhat tumid, last segment scarcely shorter than the preceding 

 one, anal opercle small. Caudal rami about the length of the anal segment, and 

 sub-linear in form, being about 3 times as long as they are broad, each carrying 

 outside, near the end ; 2 short spiniform bristles, and another more slender one 



