125 



outermost seta quite rudimentary. Eye wholly absent. Anterior antennae of 

 moderate length, and very unequal in both sexes, the left one being much the 

 longer; both antennae in male with long, band-like sensory appendages on the 

 proximal part. Posterior antennse with the inner ramus very slender, outer 

 6-articulate, with the terminal joint comparatively short. Mandibles very strong, 

 with only 4 cutting teeth, the outermost claw-like, palp with the ramus shorter 

 than the basal part. MaxillaB with the masticatory lobe poorly developed and 

 armed with only 2 spines, inner ramus of palp altogether wanting, outer large, 

 sub-sigmoid, with 3 long curved setse at the tip. Both pairs of maxillipeds power- 

 fully developed, the anterior ones with the last joint of the basal part dilated in 

 the middle, and carrying anteriorly a comparatively short but strong spine, 

 appendages of the terminal part slender, claw-like. Posterior maxillipeds with 

 the terminal part 5-articulate, and armed with strong claw-like spines finely den- 

 ticulated on both edges. Natatory legs moderately strong, basal part not pro- 

 duced at the end inside, 2nd joint of inner ramus normal. Last pair of legs in 

 female rather small, 3-articulate, 2nd joint not produced inside, terminal joint of 

 moderate size and tipped with an ordinary seta; those in male 5-articulate and 

 but slightly asymmetrical, terminal joint on both legs transformed to a slender claw. 

 jRemarJcs. This new genus is undoubtedly nearly allied to AricteUux of 

 Giesbrecht, differing, however, not only in the very conspicuous inequality of the 

 anterior antennse, but also in the structure of the last pair of legs and that of 

 the caudal rami. I have much pleasure in naming this genus in honour of the 

 distinguished Scottish naturalist, Th. Scott, who has done so much important work 

 in this order. A genus of Ostracoda, Sr-ottia, has already, as is well known, been 

 established by Canon Norman, likewise in honour of this naturalist. The present 

 genus comprises as yet only a single species, to be described below. 



54. Seottula inseqvicornis, G. 0. Sars, n. sp. 



(PI. LXXX1V & LXXXV). 



Specific Chiiniclcrs. Female. Anterior division of body but slightly 

 vaulted above, seen dorsally, regularly elliptical in form, greatest width equalling 

 about half the length and occurring in the middle, both extremities gradually 

 tapered, the anterior one narrowly rounded, the posterior deeply emarginated in 

 the middle. Cephalosome well defined from the 1st pedigerous segment, rostral 

 prominence rather large, conical, and pointing straight downwards, tentacular 

 appendages slender and elongated. Lateral lobes of last segment of metasome 



