63 



extending about to the tip of the pseudorostral projection, its 1st joint shorter 

 than the other '2 combined. First pair of logs very much elongated, about 

 equalling in length, when fully extended, the whole anterior division, basal joint 

 scarcely half as long as the remaining part of the leg, and coarsely spinous on 

 the lower edge, penultimate joint fully as long as the 3 preceding joints combined, 

 last joint not attaining half the length of the former; 2nd pair of legs with both 

 the basal and ischial joints produced at the end below to a strong spiniform 

 projection, antepenultimate joint rather slender, exceeding the last 2 combined; 

 3rd and 4th pairs with the basal joint coarsely denticulate. Uropoda rather 

 slender, with the inner ramus considerably longer than the outer, and almost 

 attaining the length of the stem, its 1st joint more than twice as long as the 

 other 2 combined, spinules of the inner edge about 12 in number (9 on the 1st, 

 2 on the 2nd and one on the last joint), apical spine very slender. Telson more 

 produced than in D. sermta, though scarcely reaching as far as the stem of the 

 uropoda, being abruptly constricted near the base, distal part very narrow, linear, 

 with about 6 small spinules on each side, apical spines rather large, slightly 

 diverging. Colour more or less tinged with reddish brown. Length 7 mm. 



Adult male exhibiting the usual slender form, with the anterior division 

 of the body considerably narrowed behind. Carapace more evenly vaulted above 

 than in female and very tumid in its anterior part, lateral faces exhibiting a low 

 longitudinal keel in addition to the 2 oblique plicse, which are fully as distinct 

 as in the female. Last pedigerous segment with the lateral corners acutely pro- 

 duced. Tail nearly smooth. Antennse and legs transformed in the usual manner. 

 Pleopoda about as in the male of D. serrata. Uropoda exceedingly slender, inner 

 ramus exceeding the outer by its last joint, and armed inside with about 28 spi- 

 nules. Telson abruptly geniculate at about the first third of its length. Length 

 about 8 mm. 



Remarks. Though nearly allied to the preceding species, as regards 

 the chief structural details, this form is at once distinguished by the still more 

 tumid anterior division of the body, and especially by the form and sculpture 

 of the carapace. The D. lamellata of Norman is unquestionably the same species, 

 and the D. Calvcri of the same author must also be withdrawn as only founded 

 on the adult male of this species. 



Occurrence. I have found this form not unfrequently in several places, 

 both on the south and west coasts of Norway, from the Christiania Fjord to the 

 Lofoten Islands. It is generally found together with the preceding species, and, 



M 



like it, has a very great range in depth. 



