COPEPODA 



229 



fc?. Size of male was 6 - 5 mm.; anterior division 5^07 mm.; urosome 1-43 mm. 



The body is more slender than in the female; the head shows trace of a crista, especially in 

 dorsal view. The lateral corners are rounded and possess a small, well marked tooth. 



The abdomen is fairly slender (PL VII fig. 6 b) and is, as seen in figure, beset with hairy spots. 

 The comparative length of the first four abdominal somites and the furcal branches is 25, 55, 45, 

 28 and 15. 



The antcnnulac extend about to the end of the body; the proximal 7 segments are more 

 powerful than in the female. The segments 8^9 to 13 are posteriorly indistinctly separated, as the 

 articular membrane is sometimes missing; the segments 20 and 21 are, on the right side, partly fused; 

 the appendages are scarcely different from the male of C. chelifer. The antennae scarcely differ from 

 those of the female, but the niandibulae differ by the wide third basipodite with three rather short 

 inner setae; the maxillulac are more soft-skinned than in the female; the L,i i has 8 short setae, but 

 the number of setae is in other respects like that of the female. The maxillae (fig. 6 c) is a soft-skinned 

 organ of somewhat similar shape to that of the female; the number of setae in the lobes is seen in figure; 

 the endopodite has 7 sensory setae, differing from rather clumsy ones basally to more slender ones distally. 



The maxillipeds are distinctly more robust than in the females; the comparative length between 

 the main divisions is 34, 34 and 15, the setae of the second basipodite, especially the sensory one in 

 the middle, are less developed; the strong curved setae of the endopodite are represented by rather 

 weak setae. 



The natatory legs are scarcely different from those of the female. The fifth pair of legs extends 

 almost to the end of the abdomen. The right leg is much shorter than the two first segments in the 

 left leg (cf. PI. VII fig. 6 b), and it forms an outward convexity; the outer margin of the second seg- 

 ment is slightly convex, and somewhat spinous; the third segment is indistinctly divided into two 

 parts, and has at least a terminal and an outer rather weak spine as well as a number of stiff hairs 

 terminally on the posterior surface. The left leg has two long cyliudric basal segments, of which the 

 distal one is much the longer; the second segment is convex outwards, and here possesses terminally 

 about 7 stiff hairs. The exopodite consists of three segments, decreasing in length as well as in 

 thickness from the first towards the third; the third segment (PI. VIII fig. 17 e) is somewhat attenuated 

 and hairy, and is in possesion of a short terminal spine. 



The epistoma (PI. VIII fig. 17 c) is well developed, with two rows of long setae; the labrum proper 

 has. anteriorly, a well developed projection, but is posteriorly rather soft-skinned, with undulated lines 

 in the chitin; anteriorly 24 rows of long bristles are found; posteriorly, rows of short bristles were 

 observed; the marginal row of hairs was apparently wanting. The oral surface of the labrum is not un- 

 like that of the female, but the granulation in front is wanting; three well separated lateral groups 

 of hairs were found on each side. In the middle, just behind the third median circular spot, a single 

 transverse group of short bristles was found. In front of a well developed serrula 6-dentata with 

 short teeth, a median elongated group with two longitudinal rows and, laterally, a single convex row 

 were found. The labial lobes are well developed, with short marginal bristles; between the lobes a 

 small pointed process is found on each side. 



