58 Rev. A. M. Norman on Crustacea Cumacea. 
species in deep water off Valentia, Ireland, while Mr. Bate 
has recorded it from Aberdeen. 
Only the male is known to me. It would be more satis¬ 
factory if we could pair it ; but the two sexes of such species 
as might be supposed to be most nearly allied to D. spinosa are 
known; and we conclude, therefore, that the female, up to 
the present time, has hidden herself. 
9. Diastylis longipes , G. 0. Sars. 
1871. Diastylis longipes, G. O. Sars, Beskr. af de paa Fregatte Jose¬ 
phines Exped. fundne Cumaceer, p. 32, pi. xiii. figs. 65-67. 
At once known by three very remarkable characters: — 
1. The extraordinary length of the first pair of feet, which 
had led me to apply the very same name in my MS. to the 
species as that which Sars has given it. 
2. The crest of spines on the underside of the first abdo¬ 
minal segment. 
3. The peculiar and unique appearance of the large telson, 
which is devoid of the usual lateral spines throughout almost 
its entire length, and has only a few minute spines close to 
the origin of the terminal fork. 
Sars records it from lat. 38° T N., long. 9° 18' W., 1 Jose¬ 
phine ’ Expedition, 550 fathoms; and it occurred in almost 
the same depth in the British dredgings, viz.:— 
Station. Lat. Long. fins. 
* Lightning,’ 1868 . 6 60° 45' N. 4° 49'W. 510 
‘ Porcupine,’ 1869 . 90 59 41 7 34 458 
10. Diastylis stygia , G. O. Sars. 
1871. Diastylis stygia , G. O. Sars, (Efvers. af Kongl. Vet.-Akad. 
Forliandl. p. 798. 
1873. Diastylis stygia, G. O. Sars, Om Cumaceer fra de store dybder i 
Nordisliafvet, Kongl. Vetensk.-Akad. Handl. xi. p. 6, pi. ii. figs. 4-7. 
A female measuring 6 millims. comes so near to D. stygia 
that I here assign it to that species; the carapace is longer in 
proportion to the free cephalothoracic segments, being nearly 
twice their length; the anterior dorsal margin of the free seg¬ 
ments is not crenulated ; the pleon is quite smooth ; the telson 
and uropods very like those of D. stygia ; the peduncle of the 
latter has ten slender marginal spines, and the inner ramus has 
seven spines on 1st, three on 2nd, and two on 3rd joint; there 
is a spine on the abdomen, between the last pereiopods. 
An immature male has the carapace as in female, except 
that the denticulations of the infero-anteal margin are larger 
and stronger, the first five abdominal segments are smooth 
