311 



shorter than the 5th and both have denticulate anterior margins; the 6th 

 segment is narrow, equal to or slightly longer than the 5th segment. Pere- 

 opods VI are similar to pereopods V but all the segments are relatively 

 shorter. Pereopods VII are short, not extending beyond the end of the 

 4th segment of pair VI. Unfortunately, the structure of the "egg forceps" 

 of the mature female was not described because Bovallius worked with a 

 young female (which he mistook for a male). According to the descrip- 

 tion of C. africanum given by Barnard, the "egg forceps" is similar to 

 that in C. pellucide: the notch of the distal margin of the 6th segment is 

 not deep and the deeply curved claw touches the apex of the process of 

 the anterior margin; the segment itself is distally broadened. 



Notes: Barnard (1916) described the species C. africanum based on 

 a specimen with three denticles on the mandible but in other characters 

 hardly distinguishable from C. longipes. Shoemaker (1945a), having at 

 his disposal fifteen specimens of C. longipes (icredibly indentified by him 

 as C. magna), mentions the often observed asymmetry in large females 

 in number of denticles on the left and right mandibles — two and three. 

 Hence the identification of the species C. africanum on the basis of three 

 mandibular denticles can hardly be justified; moreover, Barnard himself 

 remarks that a larger volume of material might lead to a change in the 

 diagnosis of his species. 



Distribution: The Atlantic Ocean from 57° N to 33° S, tropical 

 region of the Indian Ocean, south-eastern and equatorial parts of the 

 Pacific Ocean (30° S, 165° E; 7°40' N 150° W). 



5. Cystisoma latipes (Stephensen, 1918) (Fig. 125) 



Stephensen 1918: 62 (Thaumatops); Pirlot, 1938: 86; 1939: 34. 

 Length of males up to 50 mm. Female not described. The head is 

 not bulged, elongated, with straight (viewed from the top) frontal margin; 

 its width is approximately equal to somite I of the pereon. The eyes are 

 relatively small, not extending to the border with the pereon. Antennae I 

 are adjacent at the base and much longer than the head; the base is 

 two-segmented; the flagellum is not segmented, long, and pubescent on 

 the inner side. The frontodorsal surface of the head is slightly convex; 

 there are 14-15 pairs of marginal denticles and 5-6 pairs of ventral; the 

 anterior denticles are small, almost indistinguishable from the adjacent 

 glandular denticles. The mandibles bear two denticles; the central and 

 lateral denticles located at the site of attachment of the mandibles. 



The pereon has a low dorsal keel. The coxal spines of pereopods I-II 

 are low prominences. The pereopods are broader and more massive than 

 in other species, especially pereopods VI-VII. The 2nd-5th segments 

 of pereopods VI are almost equal in width, equal in length, and have 

 denticulate margins; the 2nd segment is uniformly broadened while the 

 maximum width of the 5th occurs in the middle, and the length of each 



