269 



is also 3-times as long as the carapace, especially because Pont. gracilis will perhaps prove to 

 possess also a microscopical, anterior, gastric spine, hitherto overlooked. Pont. gracilis differs 

 bv the rostrum being only armed with one pair of marginal spines and probably by different 

 measurements of the 2 nd peraeopods, according to Stebbing's quoted paper of 1905, on the 

 plate of which the chela of the anterior legs presents also a stouter shape. 



Table of Measurements in mi 



Table A. 



1 m eters. 



Length from tip of rostrum to tip of telson 



Length of carapace, including rostrum 



Length of rostrum ') 



Breadth of rostrum -) 



Width of carapace at the level of the post-antennal spines 



Greatest width of carapace 



Greatest diameter of eye 



Length of antennal scale 



Breadth of antennal scale 



Length of first peraeopod, dactylus excluded 



Length of propodus of this leg 



Width of propodus midway between the proximal and distal extremity . 



Length of second peraeopod 



Length of carpus of this leg 



Length of chela 



Breadth of chela 



Length of dactylus 



Length of abdomen 



Length of sixth somite 



Breadth of sixth somite in the middle 



Length of telson 



Length of inner uropod 4 ) ' 



Length of outer uropod 4 ) 



Distance, in the middle line, between tip of rostrum and tip of gastric spine 



4 

 35,5 



8,6 



',4 



0,4 



4,45 

 4,6 



1,6 



5,3 

 1,32 

 '2,5 



5,5 

 1,25 



5,i 



o,5 



1,2 



0,22 



0,62 



27 

 6 



i,3 

 6,5 

 6,75 

 6,25 



5,i5 



N° 1 ova-bearing female from Stat. 45 ; N° 2 ova-bearing and N° 3 young female from 



Stat. 316; X" 4 male from Stat. 300. 



Table B. 



Length of carapace, rostrum included 



Length of rostrum 



Breadth of rostrum 



Greatest diameter of eye 



1'roportion between the length of cara- 

 pace and the greatest diameter of eye 



1'roportion between length and breadth 

 of rostrum 



11,6 



1,7 

 o,5 

 2 



5,8 



3,4 



11,6 



',7 

 0,6 

 2 



5,8 

 2,8 



14 

 7 



1,24 

 0,28 

 1,4 



5 



4,4 



1) The rostrum, being directed more or less obliquely upward, is measured in a horizontal position, when the carapace has been 

 placed obliquely. 



2) The breadth of the rostrum is the distance between the apices of the posterior pair of teeth. 



3) The length is taken from the base to the tip, in the middle line, without the terminal spines. 



4) The two uropods are measured from the articulation with the 6'h somite, the basal joint being included. 



