21 



Table C. 

 Measurements of the carpus and chela of the 2°^^ legs. 



Right leg 



Left leg 



Length 



Width 



Length 



Width 



Length 



Width 



Length 



Width 



Length 



Width 



Length 



Length 



Length 



of I St segment . . 

 at distal extremity 



of 2°d segment 

 of 2nd segment . . 



of 3r<l segment. . 

 of 3rd segment . . 



of 4th segment. . 

 of 4'h segment . 



of 5'1> segment. . 

 of 5'li segment . 



of chela .... 



of palm .... 



of fingers . . . 



0,8 



0,12 



0,14 



0,12 



0,14 



0,12 



0,16 



0,12 



0,32 



0,126 



0,56 



0,26 



0.3 



0,76 

 0,12 

 0,14 

 0,12 



0,14 

 0,12 

 0,14 

 0,12 

 0,32 

 0,12 



0,54 



0,3 



0,24 



15. Athanas Djiboutensis Cout. 



Athanas Djiboutensis H. Goutiere, Alpheidae Maid, and Laccad. Archip. 1905, p. 856, fig. 129. 

 Stat. 172. August 26 28. Anchorage between the island of Gisser and Geram-Laut. Reef, i sp. 



Though it has lost the legs of i*' pair, this specimen certainly belongs to A. Djiboutensis^ 

 which is easily distinguished by the infra-corneal spine being much larger and much more 

 prominent than the extra-corneal. Entire length 7,12 mm. from tip of rostrum to tip of telson, 

 the carapace, rostrum included, measuring 2,8 mm., the abdomen 4,32 mm. The rostrum, just 

 as long as the telson, measures almost half the length of the rest of the carapace and reaches 

 to the far end of 2"<^ antennular article; the lateral margins run parallel along the proximal 

 third and from here converge to the acute tip, while the rostrum is carinate above. Viewed 

 from above the extra-corneal spine reaches to the middle of the eye, the supra-corneal spine 

 is a little shorter and the infra-corneal is almost as long as the eye; in a lateral view the 

 latter appears as long as the eye, the extra-corneal appears only half as long, reaching a little 

 more forward than the supra-corneal spine. 



Telson 0,88 mm. long, 3-times as long as the distance (0,28 mm.) between the postero- 

 lateral angles and twice as long as the width at the base ; posterior margin rounded, a little 

 prominent, fringed with long feathered setae and with two spines at either side, of which the longer 

 inner ones are 0,15 mm. long. Dorso-lateral spinules, the anterior 0,1 mm. long, the posterior 

 0,12 mm., the former just before the middle, the latter about at the posterior third. 



Merus of the peraeopod of 2"'' pair 0,76 mm. long, 4-times as long as broad, showing 

 the greatest width at the posterior third and somewhat narrowing distally; i'*' segment of carpus 

 0,5 mm. long, 2"'' 0,1 mm., 3"^ 0,12 mm., 4"'' 0,14 mm., 5''^ 0,24 mm., half as long as the 

 I*', the entire length 1,1 mm., so that the carpus is one and a half as long as the merus; 

 chela 0,4 mm. There is still one of the three posterior legs lying loose in the tube, probably 



