25 



6. Hemilamprops cristata, G. 0. Sars. 



(PI. XVIII.) 



Lamprops cr'mlnltt, G. O. Sars, Nye Dybvandscrustaceer fra Lofoten. 

 Clir. Vid. Selsk. Forli. l.Sii!), p. 13. 



Specific Characters. Body slender and elongated, somewhat resembling 

 that of H. uniplicatn. Carapace, however, rather different, conically tapered in 

 front, and without any lateral folds, gastric region surmounted by a distinctly 

 elevated longitudinal crest, which in female is finely denticulated throughout, the 

 denticles being also continued on the ocular lobe; branchial regions very pro- 

 minent; pseudorostral projection short, but distinct, acute. Tail much longer 

 than the anterior division, and very slender, attenuated distally. Eye small, but 

 distinct, with bright red pigment. 1st pair of legs very slender, equalling in 

 length the anterior division of the body, terminal joint exceedingly narrow, linear, 

 and longer than the penultimate one; the remaining pairs about as in H. uni- 

 l>in-nta: 3rd pair in male but slightly transformed. Uropoda slender and elon- 

 gated, exceeding in length the last 2 segments combined, inner ramns but 

 slightly longer than the outer, the latter densely setiferous along both edges. 

 Telson comparatively short, being scarcely longer than the last segment, and not 

 nearly attaining the length of the basal part of the uropoda, sub-lageniform in 

 shape, with the outer part abruptly contracted, and exhibiting 2 or 3 pairs of 

 lateral spinules; apical spines 3 in number, much larger than the spinules and 

 subequal in length. Colour light orange, or golden yellow. Length of female 7 

 mm., of male about the same. 



Remarks. This form is easily distinguishable from any of the preceding 

 species by the finely denticulated crest surmounting the gastric region of the 

 carapace, in which respect it agrees with the species recently described by M. 

 Jules Bonnier from the Gulf of Gascogne as H. Normani ; but in other respects, 

 this form is rather different. It is moreover easily distinguished from H. unipli- 

 rata, to which it bears some resemblance in the slender and elongated form, by the 

 absence of lateral folds on the carapace, and by the form and armature of the telson. 



Occurrence. I first detected this species off the Lofoten Islands, and have 

 subsequently also taken it in several other localities, for instance at Mosterhavu 

 in the outer part of the Hardanger Fjord, at Christiansund and in the Trondhjem 

 Fjord. It is a pronounced deep-water form, only occurring in depths of more 

 than 100 fathoms. 



Distribution. British Isles (Robertson), Stat. 23 of the Porcupine Ex- 

 pedition (Norman). 



Crustacea. 



