110 Mr. W. "M. Tattersall on neiv 



membranous integument such as is described for D. dactijlops ; 

 the outer distal corner produced into a rather long digitate 

 and Hexiblc process ; a shorter and firmer process on the 

 inner and upper face of the eye, which a raised ridge connects 

 to the main parts of the eye, so that the ^hole organ is tri- 

 angnlar in cross-section and not flat ; visual elements much 

 more numerous than in D. dactijlops, confined to a triangular 

 aroa on the outer part of the eye at the base of the outer 

 process; pigment confined to the visual elements^ pale 

 purplish pink in freshly preserved specimens. 



Anteniiular peduncle rather short, with the third joint a 

 little longer and very much stouter than the first and more 

 swollen in the male than in the female ; second joint small; 

 male appendage well developed, but only slightly hirsute, as 

 the specimen is still immature. 



Atitcnual peduncle shorter than the antennular and having 

 the second joint slightly larger than the subequal first and 

 third joints. 



Antennal scale almost twice the length of the antennular 

 peduncle ; about four to four and a half times as long as 

 broad ; outer margin entire and ending in a strong spine, 

 beyond which the apex of the scale is not produced ; no 

 spine on the basal joint. 



Mouth-parts fundamentally as in the genus Amhlyo/s. 

 First and second thoracic /«/;i^6' likewise agreeing with those 

 ot" the genus Amblyops, except that the second limb is com- 

 paratively longer. 



Remaininfj thoracic limJis broken away. 

 E.iopods of all the thoracic limbs with the outer distal 

 corner of the basal joint slightly acuminate; flagelliform 

 part well developed and composed of about seventeen joints. 

 Incubatory lamella of the female, two ysiirs. 

 Pleopuds in the only male, which is immature, h ive the 

 inner branch of the first pair already more developed than in 

 D. dactylops and armed with many more setae ; otlierwise 

 they conform to the Amblyops type. 



Telson comparatively short ; about two thirds (slightly 

 less) of the length of the last segment of the pleon ; sub- 

 triangular in shape; one aud a half times as long as broad 

 at its base; margins ta| ering evenly to a bluntly rounded 

 apex ; the distal third of its margins armed on each side 

 ■with ten rather stout spines increasing slightly in length 

 towards the apex; a pair of median plumose setae situated 

 at the apex between the terminal spines of the margins. 

 Uropods moderately slender : inner, one and two-thirds of 



