MACRUROUB DECAPODA OF THE SUDANESE RED SEA. 363 



more nearly to the proportions shown by Paulson, and the size of the scale 

 evidently increases with age. 



On the sixth abdominal segment (PI. 27. fig. 6) the median carinas are 

 invariably wider than the intermediates. In the male the median carinse 

 are parallel, but in the female they are slightly divergent. All the carinse on 

 this segment are smooth and do not terminate in spines, though the lateral 

 carinse terminate more acutely than shown in Paulson's figure 3 r. 



The telson (PI. 27. fig. 6) bears in the middle of the dorsal surface an 

 oval smooth elevation terminating distally in young specimens in an obtuse 

 slightly transverse tubercle. This tubercle becomes obsolete or almost so 

 with growth ; it is hardly discernible in the largest specimens. On each side 

 of the median elevation there is a prominent submedian carina in close 

 contact with the median one throughout its length. Lateral to the sub- 

 median again there is on each side a much fainter carina, distinct in its 

 posterior half but merging into the submedian carina anteriorly. It presents 

 the appearance of a half carina only. Lenz in his figure of the telson of 

 G. fimbriatus figures two faint carinas lateral to the submedians, but none of 

 the present specimens show traces of more than one. The carinte of the 

 intermediate spines are well marked and smooth, while the lateral margin of 

 the telson is thickened to form a ridge. There are two tubercles near the 

 anterior margin of the telson, one on each side of the median elevation and 

 homologous with those found in G. cldragra. 



There arc no lateral spines on the telson. The intermediate spines are 

 about half as long as the submedians. The inner margins of the latter bear 

 a row of from nine to twelve slender spinules. There is in most of the 

 specimens a single similar spinuie on the outer margin of the submedian 

 spines and one on the inner margin of the intermediates. In one specimen 

 I found traces of more spinules on the outer margin of the submedians, on 

 one side of the specimen only. 



The inner spine of the ventral prolongation of the uropods is longer than 

 figured by Paulson, being at least half the length of the outer.- The latter . 

 has the very distinct shape shown in Paulson's figure, with the distal 

 extremity rather strongly incurved. 



The uropods (PI. 27. fig. 6) are very distinctive. The peduncular segment 

 bears a strong spine dorsallyon the distal margin. The basal segment of the 

 exopod projects far beyond the articulation of the ultimate segment, and 

 bears on its outer margin, at the distal end, three (in one case two) stout 

 strongly falciform spines, outwardly recurved, and proximally to these, from 

 three to five short straight spines. On the dorsal surface of the basal 

 segment of the uropods, near to the articulation of the distal segment, there 

 is a pad of rather long densely plumose setae. The dorsal surface of the 

 distal segment of the exopod is beset all over with short plumose setse and 



28* 



