49 
smooth; eye much larger and more prominent. The several appendages very 
nearly as in the male of D. cornuta. Length 9 mm. 
Remarks. — This species is nearly related to D. cornuta, but is easily distin¬ 
guishable in botli sexes, the female especially being at once recognized by the 
peculiar sculpture of the carapace, which has given rise to the specific name 
rugosa. The Diastylis strigata of Norman seems to be the adult male of this 
species, judging from the diagnosis given by that author. 
Occurrence. — I have met with this form in several places, both on the 
south and west coasts of Norway, from the Christiania to the Trondhjem Fjord. 
It is generally found at less considerable depths than most other species, from 10 to 
20 fathoms, occurring not infrequently at the roots of Laminarise and between the 
red algae, where no other Diastylis is met with. 
Distribution. —Kattegat (Meinert), Heligoland (Ehrenbaum), British Isles 
(Norman), coast of France (de Folin), Mediterranean at Spezia, Messina and 
Syracusa (the present author). 
4. Diastylis lueifera (Kroyer). 
(PI. XXXVIII). 
Oiima lueifera, Kroyer, Nat. Tidsskr. Bel. 3, p. 527. 
Syn: Diastylis borealis, Sp. Bate. 
Specific Characters. — Female. Body comparatively short and thick, with 
the anterior division ovoid in form and but slightly arcuate dorsally. Carapace 
not very large, but slightly exceeding in length the exposed part of the trunk, 
and somewhat sloping in front; dorsal face rather densely clothed with small 
denticles arranged on the frontale lobe in transverse rows, one of them originating 
from the ocular lobule itself; pseudorostral projection conically produced, hori¬ 
zontal; subrostral corners almost obsolete. Exposed part of trunk smooth above, 
last segment with the lateral parts not produced behind. Tail shorter than the 
anterior division, segments simple, unarmed. Eye distinct, though rather small. 
Superior antennae slender, with the peduncle projecting far beyond the tip of the 
pseudorostral prominence, its 1st joint somewhat shorter than the other 2 com¬ 
bined and unarmed. First pair of legs not much elongated, and having the 3 
distal joints of about equal length; 2nd pair with the antepenultimate joint much 
shorter than the last 2 combined, and scarcely longer than the terminal joint; 
3rd and 4th pairs without any denticles on the basal joint. Uropoda with the 
outer ramus somewhat longer than the inner, and considerably exceeding half the 
7 — Crusatcea. 
