4 Fishery Board for Scotland. 



segments are rough with minute prickles ; so also is the dorsum of the 

 cephalothorax. The telson is tolerably elongated, being about two- 

 and-a-half times the length ot the last pleon segment, and rather 

 longer than the peduncle of the uropods ; it is subcylindrical for 

 about two-thirds of its length, and then becomes gradually narrower 

 towards the apex. The lateral margins of the distal portion are 

 distinctly coarsely serrated, and the apex is provided with two 

 moderately stout and somewhat divergent spines. The length of the 

 specimen represented by the drawing (fig. 1) is about 12 mm. 



Habitat— " Goldseeker " Station 53 (Lat. 59°36 N., Long. 7°00 

 W.), at 140 meters, in August 1907. Bare. Pending the discovery 

 of further specimens, and the determination of its relationship with 

 other species, I have ascribed this form provisionally to Diastylis ; its 

 most distinct and obvious peculiarity seems to be the form and 

 armature of the telson. 



Diastylojpsis (?) dubia, Bonnier. PI. I., fig. 5. 



1896. Diastylopsis (?) dubia, Bonnier, Campagne du " Caudan," 



Ann. l'Univer. de Lyon, p. 559, PI. XXX., fig. 3 a— m. 



One or two specimens, apparently identical with the form described 

 under this name by Bonnier, were obtained in gatherings collected 

 at two " Goldseeker " stations, viz , Station 53 (Lat. 59°36 N., Long. 

 7°00 W.), at 1000 meters, in July, and at 1100 meters in Lat. 59°25 

 N., Long. 7° 33 W. in August 1907. The telson in this species, as in 

 Die tubulicauda (Caiman), is unusually elongated ; it is C3dindrical or 

 nearly so for about three-fifths of its length ; the sides then gradually 

 converge towards the apex, which is narrow and carries two small 

 scarcely divergent spines. The lateral margins of the basal portion of 

 the telson are minutely but distinctly serrated. The uropods, which 

 are slender and do not appear to reach far beyond the telson, have 

 the peduncle narrow and considerably elongated. 



Genus Die. Stebbing, 1910. 

 Die tubulicauda (Caiman). PI. I., fig. 6. 

 1905. Diastylis tubulicauda, Caiman. Fisheries, Ireland, Sci. Investi- 

 gations, 1894, I. (1905), Cumacea, p. 46, PI. V., figs. 82-86. 



This species was obtained in a gathering collected at 1100 meters 

 in Lat. 59°25 N., Long. 70°33 W., August 17, 1907, and is the only 

 sample in which I have met with it. Perhaps the most obvious 

 character by which this species may be distinguished is the some- 

 what peculiar form and structure of the telson, and particularly the 

 apical portion of it. The telson is elongated, cylindrical, and not very 

 stout ; its width is about the same throughout, and, instead of tapering 

 at the distal end, it terminates somewhat abruptly in a kind of 

 trifid apex. The uropods are long and slender, but do not reach much 

 beyond the end of the telson. The length of the specimen represented 

 by the drawing (fig. 6) is about 8 mm. Only one or two specimens 

 were observed. 



Diastylis tubulicauda was obtained by Dr. Caiman in material 

 collected 77 miles W.N.W. of Achil Head, County Mayo, Ireland, 

 at a depth of 382 fathoms (fully 700 meters), but only one specimen 

 was noticed. 



