NO. 1876. 0?i/ THE CRUSTACEAN ORDER GVMACEA—CALMAN. 635 



Shoal Tickle, near Nain, Labrador; Owen Bryant, August 15, 1908; 

 U.S.N.M. 44088; 1 female. 



Albatross station 2697; off Newfoundland; lat. 47° 40' 00" N.; 

 long. 47° 35' 30" W.; 206 fathoms; U.S.N.M. 440S9; 2 females. 



DIASTYLIS DALLI, new species. 



Adult female (with empty brood-pouch). — Total length, 24 mm. 



Resembling D. scorpioides (Lepecliin) in general appearance; sur- 

 face of carapace much smoother and the ridges not crenulated. There 

 are only four oblique ridges on each side of the carapace; the first is 

 rather obscure and runs forward on the side of the pseudorostrum; 

 the others are very bold and prominent; the second and tliird run, 

 without uniting, to the lower edge of the carapace, while the fourth 

 approaches or actually joins the tMrd near its lower end. The longi- 

 tudinal ridges uniting the upper ends of the three posterior obhque 

 ridges on the dorsal surface are very prominent and the area between 

 them is grooved in the middle line. The pseudorostrum is very short, 



Fig. 40.— Diasttlis dalli, immature female, from the side. 



its upper edge sloping slightly downward and the lateral plates meet- 

 ing only for a distance not greater than the length of the ocular lobe. 

 The ocular lobe is as long as broad. 



The pleural plates of the second free thoracic somite are pointed in 

 front. The abdomen (excluding the telson) is about as long as the 

 cephalothoracic region. 



The telson is longer by one-third than the last somite and nearly 

 equal in length to the peduncle of the uropods; it tapers from the 

 base and the post-anal portion is longer by one-half than the pre-anal. 

 There are about 11 pairs of lateral spines which are considerably 

 smaller than the apical pair. 



Peduncle of antennule with last segment longer and much more 

 slender than the second, first longer than second and third together. 

 Penultimate segment of antenna elongated. 



Third maxilliped not expanded distally; its length along the inner 

 edge more than eight times its width; ischium large, longer than 

 merus as seen from below; merus expanded externally but not 

 broader than ischium. 



