+ 0.6°, captured a considerably smaller, juvenile specimen, which is at least allied to Z. wnczfera and
L. dentata, but the process from the peduncle of the uropods is very small and subhorizontal, prob-


ably not yet developed.
Group c. Uropods with the endopod two-zointed, the exopod well marked off, onezointed.
These characters pointed out are very practical. But the group comprises in reality rather
heterogenous elements, and its nine species mentioned on the following pages may be referred to three
natural subdivions.
a. Pleopods wanting or extremely rudimentary in the females. The basal joint
of the chelipeds normal, possessing a posterior process with the hind margin


free and rounded. Slender species. Species 54—58.
B. Pleopods very distinct with well developed sete in the females. The basal

joint of the chelipeds normal, as in subdivision « Very stout species.
Species 59—60.
y, Pleopods very distinct with well developed sete in the females. The basal
joint of the chelipeds aberrant, in a lateral view the long major part of its
posterior margin is vertical and attached to the cephalothorax at or even
before its middle, while the posterior process is short and situated more on


the lower than on the lateral side of the cephalothorax. Species 61—62.
Group c, subdivision «& (vid. above).
54. Leptognathia manca G. O. Sars.
(Pl. VIII, figs. 5a—5d.)
1881. Leptognathia (?) manca G. O. Sars, Arch. for Math. og Naturv., B. 7, p. 44.
1896. — _ — Account Crust. Norway, Vol. I, p. 30, Pl. XIV, fig. 2.
Though Sars’ description and figures are sufficient for the recognition of this species, I think


it useful for comparison with the following forms of this subdivision to give a new description and a


86 CRUSTACEA MALACOSTRACA. II.
