303 



4th and 5th segments are about 2/3 the length of the 2nd segment; the 

 medial surface of the 5th-6th segments has transverse rows of thin setae; 

 the 6th segment in mature females is bulged and clavate because of the 

 highly developed gland, its maximum width occurring slightly before 

 the distal end, the medial surface covered with setae, and the anterior 

 prominence of the distal margin separated from the base of the claw by 

 a notch; the base of the claw rises above the notch and the thick, deeply 

 curved claw rests with its tip in the anterior prominence, thus closing 

 the place for the egg. 



The urosome (with uropods) is longer than the pleon. The basipodite 

 of uropods I is four times longer than wide; the endopodite is short and 

 proximally broad; the exopodite in females is much longer, in males 

 slightly longer than the endopodite; in females it is almost half the length 

 of the basipodites, distally bulged, but with an acute apex. The basipodite 

 of uropods III is slightly broadened distally and the ratio of length to 

 maximum width 3:1; the exopodite is slightly more than half the length 

 of the basipodite. 



Distribution: Widely distributed in the Atlantic (from 45° N to 

 35° S) and Indian oceans, and in the Indo-West Pacific. In the Pacific 

 Ocean it was found off southern California and in the waters of Tasmania 

 at 43° S, and 150° E. 



2. Cystisoma magna (Woltereck, 1903) (Fig. 122) 



Woltereck, 1903: 455 (Thaumatops); Spandl, 1927: 171 (Thau- 

 matops). 



Length of females up to 140 mm, of males up to 70 mm. 



The head in females is spherical, in males its height slightly exceeds 

 its length. The eyes are dorsal, occupy only upper part of the smooth 

 convex lateral surface. There are 10-14 marginal denticles. The ventral 

 surface of the head is slightly convex but highly so in the region of 

 two-six pairs of ventral denticles; the anterior denticles are very large 

 while the glandular denticles do not differ from the subsequent ones. 

 The mandibles have one strong short central denticle each. Antennae I 

 (viewed laterally) are distinctly attached in the female below the lateral 

 border of the eyes. 



The pereon is significantly lower than the head, with a dorsal crest 

 more raised than in other species. The coxal spines are shorter than 

 in C. pellucida. The 2nd segment of pereopods I is almost the same 

 length as the rest of the leg, its anterior margin denticulate and the 

 posterior margin smooth; the 5th segment is convex anteriorly and bears 

 two carines, its process is broad and denticulate and extends to the end 

 of the 6th segment; the 6th segment is shorter than the 5th, its anterior 

 margin convex and carinate, the posterior margm stright and denticulate; 

 249 the chelae of the 5th-6th segments are indistinctly denticulate, sometimes 



