454 



E. RAY LANK ESTER. 



less riclily furnislied with hairs; these hitter notably are not 

 present on the dorsal face of the carapace. 



2. The cervical groove is much more marked iu C. quad- 

 ratus, but the branchial region is less so, and in fact presents 

 no distinct limit anteriorly. 



4 \ ,t. 



Fig. 10. — Outline diagrams of the anterior margin of the carapace, 

 the rostrum, and ocular peduncles of two specimens of Cymo- 

 nomus quadratus, M.-Edw. The upper figure is taken from 

 M. Milne-Edwards' figure in ihe "Travailleur " volume, and the 

 lower is drawn from a specimen kindly communicated by M. 

 Bouvier. Both figures show the peculiar form of the ocukr 

 peduncles, e, differing both from tiiose of C. granulatus and C. 

 Normani; also the proportionate size of the rostrum, r. The 

 lower figure shows a greater size attained by the extra-orbital 

 spines, sp, and a rounding off of the lateral angles of the carapace, 

 as compared with tiie type. 



3. The rostral region^ is less pronounced, and advances 

 less distinctly in front of the carapace; the rostrum is much 

 narrower, and has no denticles on its margins. 



4. The ocular peduncles ai-e much more delicate, and arc 

 gradually attenuated from the base to the summit ; their 



' See our text block, Fig. 10, r, and compare with PI. 33, fig. 2. 



