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. Rare. 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. 
Diastylopsis (2) dubia, Bonnier. PI. 1, fig. 5. 
“1896.  Diastylopsis (?) dubia, Bonnier, Campagne du “‘ Caudan,” 
Ann. l’Univer. de Lyon, p. 559, Pl. 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 
Dic tubulicauda (Calman), is unusually elongated ; it is cylindrical 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. 
Sims Genus Dic. Stebbing, 1910. 
Die tubulicauda (Calman). Pl. L., fig. 6. 
1905. Diastylis tubulicauda, Calman. Fisheries, Ireland, Sci. Investi- 
gations, 1894, I. (1905), Cumacea, p. 46, Pl. 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. Calman 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. 
