49 



smooth ; eye much larger and more prominent. The several appendages very 

 nearly as in the male of D. cornutn. Length 9 mm. 



Remarks. This species is nearly related to J). cornuta, but is easily distin- 

 guishable in both sexes, the female especially being at once recognized by the 

 peculiar sculpture of the carapace, which has given rise to the specific name 

 rtnjosa. The Didsti/lis xtri<jf<t 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 alga>, 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). 

 ( 'tuna lueifera, Kroyer, Nat. Tidsskr. Bd. i3, 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 antenna? 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 denticlts on the basal joint. Uropoda with the 

 outer ramus somewhat longer than the inner, and considerably exceeding half the 



7 Crusatcea. 



