23 



about three times as long as broad, a little curved and very closely set with seta; along its 

 inner margin. 



First to third pairs of legs are similar in structure, gradually longer behind, so that the 

 third pair are about as long as the cephalothorax ; the end of these legs is built as in the 

 corresponding legs of Hansenojnysis Fyllce H. J. H. ^). Fourth pair of legs considerably longer 

 than the cephalothorax (PI. I, fig. 5«), somewhat longer than the following pairs; seventh joint 

 and the claw constitute together a very long "claw" as in Hansenomysis "). 



The pleopods in the female (PI. I, fig. 5«) increase much in length from first to fourth 

 pair, but the fifth pair are even slightly longer than the sum of fourth and fifth segments; all 

 these appendages are simple, without any inner ramus. — The pleopods in the male are well 

 developed ; the rami of the various pairs are built essentially as in Hansenomysis FyllcB ^), but 

 more slender than in this smaller form. 



The uropods (PI. II, fig. ic) are far from reaching the end of the telson; their rami are 

 very slender with setse along both margins. The exopod, which is a little shorter than the 

 endopod, has its distal part marked off by an articulation ; the proximal joint has in the female 

 specimen a long spine at its distal outer angle and on the left exopod besides a small spine 

 beyond the middle of the outer margin, while in the male specimen two closely set spines are 

 found at the distal angle and two other spines on the outer margin. 



The telson (PI. II, figs. \c and \ d) is very long, nearly as long as the sum of the three 

 preceding segments (PI. I, fig. 5^), narrow, more than six times as long as broad, broadest 

 near the base, then a little tapering, but in the female specimen widening again very slightly 

 from the end of the first third to the end which is cut off with the margin feebly convex. The 

 lateral margins, excepting their proximal fourth, are closely set with spines, several of which 

 are long, while numerous short or very spines are distributed in the intervals. Each postero- 

 lateral angle has in the female specimen a very long and strong spine (PI. II, fig. i a'), the 

 terminal margin two moderately long and some five much shorter spines. In the male specimen 

 the lateral margins of the telson are feebly converging in their distal third, but the armature 

 of the transverse terminal margin is broken off. 



Length of the adult male 27 mm., of the female with the marsupium half developed 25 mm. 



Remarks. — As already stated C. egrcgia is closely allied to C. spinosa Fax., but a 

 comparison between the "Siboga" animals and the description and figures given by Faxon 

 reveals several differences of specific value. In C. spinosa the large dorsal spine on the first 

 abdominal segment is deeply bifid, while the corresponding spine on second segment is simple; 

 in C. egregia both these spines are bifid. The abdomen is proportionately longer in C. egregia 

 than in C. spinosa, the fifth pair of pleopods in the female are much longer than in C. egregia 

 (and without lateral branch). Judging from Faxon's fig. i on pi. LXI the antennal squama and 

 the exopod of the uropods in C. spinosa have several more spines along their outer margin 

 than in C. egregia. Finally Faxon describes the lateral margins of the telson in C. spinosa as 



1) Comp. fig. 5^;^ on pi. VII in Vid. Medd. Naturhist. Foren. Kjobenhavn for 18S7. 



2) Comp. fig. 5/; on pi. VII in the same book. 



3) Comp. figs. i,d — 4/; on pi. IV in "Ingolf" Crust. Malac. I. 



