68 
14. Leptostylis longimana, G. 0. Sars. 
(pi. xLvra). 
Diastylis longimana, G. 0. Savs. Om den aberrante Krebsdyrgruppe Cumacea, p. 48. 
Specific Characters .— Female. Body comparatively slender, though having 
the anterior division considerably tumefied and rounded oval in form. Carapace 
large and deep, more than twice as long as the exposed part of the trunk, and 
slightly vaulted above, surface perfectly smooth throughout, and only clothed 
with scattered small hairs; pseudorostral projection of moderate size, triangular, 
subrostral corners obsolete, lower edges of carapace abruptly curved in the 
middle, with the anterior half minutely denticidate. Epimeral parts of the 3 
posterior pedigerous segments comparatively small and rounded off behind. Tail 
(exclusive of the terminal appendages) exceeding the length of the anterior division 
and very slender. Superior antennae rather elongated, the peduncle extending far 
beyond the tip of the pseudorostral projection, its last joint scarcely shorter than 
the 1st, but much narrower, and, like the 2nd, clothed on both edges with slender 
bristles. First pair of legs exceedingly slender and elongated, and, when fully 
extended, exceeding half the length of the body, basal joint occupying scarcely more 
than V 3 of the length of the leg, and without any spinules, penultimate joint of 
extraordinary length, fully equalling that of the 3 preceding joints combined, last 
joint comparatively short, not attaining even 1 / 3 of the length of the penultimate 
one; 2nd pair likewise rather slender and much curved, basal joint comparatively 
short, last joint very slender, exceeding the length of the antepenultimate one; 3rd 
and 4th pairs rather narrow, with the rudimentary exopodite easily observable and 
carrying a single apical bristle. Uropoda much elongated, with the inner ramus 
very narrow, and exceeding the outer by its last joint, 1st joint longer than the 
other 2 combined, spinules of the inner edge only 5 in number (3 on the 1st, 
and 1 on each of the last 2 joints), apical spine very slender, almost setiform. 
Telson not attaining even the length of the last caudal segment, and rather thick 
at the base, distal part abruptly narrowed and, as in the other species, provided 
with only a single pair of lateral spinules near the tip, apical spines somewhat 
larger, and extended straight behind. Colour whitish. Length 0 V 2 mm. 
Adult male scarcely more slender than the female, but having the 
carapace less deep, and the pseudorostral projection more prominent. Tail scarcely 
exceeding in length the anterior division, and very narrow, unarmed, terminal 
appendages scarcely different from those in the female. Length about 5 mm. 
Remarks .—This form was first described by the present author as a 
species of the genus Diastylis, the specific name proposed being derived from the 
