20 



The three following legs regularly diminish in length and stoutness. The ischium of the 

 legs of the 3'''^ (Fig- 10^) and 4''' pair are armed with one or two spines inferiorly, but not that of 

 the s'"" ; for the rest these legs are nearly unarmed. Carpus of y^ pair three-fifths of the merus^ 

 4-times as long as thick distally; propodus almost twice as long as the carpus, 9-times as long 

 as wide, its posterior margin with 7 or 8 small spinules and with a much longer spine, long 

 0,2 mm., at the distal extremity, almost half as long as the dactylus; dactylus simple, not 

 biunguiculate, slightly curved near the tip, measuring one-third of the propodus and 6-time& 

 as long as broad at its base. The legs of the 4''' pair nearly agree with those of the 3'^ ; in 

 those of the $^^ (Fig- 10/) the carpus measures two-thirds of the merus and a little more than 

 half the length of the propodus, which bears tufts of setae, not found in the two preceding 

 pairs, on the distal fourth of the lower margin, and at the distal end the long spine, that also 

 exists on the propodus of the 3'''^ and 4''' pair. 



The endopodite of the 2°^ pleopod bears only one appendix, the stylamblys. Only 3 or 

 4 ova were still preserved, they are small, 0,5 mm. long. 



Athanas dimorphiis Ortm. differs by the shorter rostrum that reaches only to the far 

 end of the basal antennular article, by the infra-corneal angle being acute, not rounded, by the 

 telson being broader posteriorly and by the much shorter chela of the i*' peraeopods of the 

 female, that is but little more than half as long as the carpus. The female of A. polymorphus 

 Kemp differs also by the acute infra-corneal angle, by the existence on the carapace of a sharp 

 tooth opposite to the insertion of the antennae, by the 2"*^ joint of the antennular peduncle 

 being not shorter, but almost twice as long as the 3'^'^, by the shorter stylocerite, by the shorter 

 chela of the i*' pair of legs, in which the fingers are as long as the palm etc. 



Measurements in millimeters. 



Table A. 



Length of telson 1,16 



Width of telson at base 0,65 



Distance between the postero-external angles 0,34. 



Distance between the posterior margin of 6>h somite and the anterior pair of dorso-lateral spinules. 0,52 



Distance between the posterior margin of 6''i somite and the posterior pair of dorso-lateral spinules 0,8 



Table B. 



Right leg Left leg 



of the 1st pair ofthelstpair 



Third leg | Fourth leg Fifth leg 



Length of ischium . 

 Length of merus. 

 Width of merus .... 

 Length of carpus . . . 

 Width of carpus distally . 

 Length of chela .... 

 Length of palm .... 

 Length of fingers . . . 

 Length of propodus . . 

 Width of propodus . 

 Length of dactylus . . . 

 W'idth of dactylus at base 



