86 



hooked, and the posterior one reaches nearly to the end of 

 the second joint. The flagellum has 19 short joints. 



The flagellum of the antenna has 20 joints. 



The legs are uniform, with furry pads on the usual 

 joints. 



The sternal filaments are short. 



The first pleopods are short and broad, the outer ramus 

 has few or no teeth — apart from the slight elevations which 

 carry the setae — and there are few setules, as observed in 

 other species : there is a ridge near the inner margin. The 

 inner ramus is much broader than long, and is also without 

 marginal teeth. The outer ramus of the second pleopods 

 has several marginal teeth and setules, which arise in the 

 intervals between the plumose setae. The appendix masculina 

 arises, as in other members of this genus, about half-way 

 along the inner margin of the inner ramus. The outer ramus 

 of the fifth pleopod has the division quite near the end, the 

 terminal lobes are well developed : there is also one on the 

 inner margin, which is smaller, longer, and narrower than 

 usual. The external margin bears fine hairs. Near the ex- 

 ternal margin of the outer ramus of the fourth pleopods 

 there is a small conical process near the base, slightly serrate. 



The external ramus of the uropod is large, acute, and 

 slightly serrate on the external margin near the end : it 

 reaches much beyond the inner ramus. The inner ramus 

 reaches nearly to the abdominal notch, and is distally trun- 

 cated, the inner angle being rounded, the outer acute. 



The female of this species is smaller than the male. It 

 is distinguished by its shape, and by having the median 

 triangular tubercle of the after-part of the abdomen much 

 larger than in the male ; in having the outer ramus of the 

 uropod only slighter longer than the inner ramus : the pos- 

 terior notch of the abdomen is not so open and not so deeply 

 cut into the margin, and the median process is more raised, 

 making the narrow channel deeper. The epimera of the 

 seventh thoracic segment is pointed behind, but not hooked. 

 The anterior process of the antennular joint is long, but not 

 quite so hooked. The female also has a larger number of teeth 

 on the external rami of the first and second pleopods. 



Several specimens from North Tasmania. Females pro- 

 bably not quite mature. Collected by Dr. Torr. 



EXPLANATION OF PLATES. 



Plate XXI. 



Fig. 1. Cymodoce tuberculosa. Stebbing, side view of male, mag- 

 nified 4£ diameters. 

 .,2. ,, ,, posterior portion of abdomen of 



male. 



