DINEMOURA PRODUCTA. 87 



than the segment last described and equal to nearly 

 two-thirds of the width of the carapace ; the postero- 

 lateral corners of the segment produced backwards into 

 moderately narrow lobes with rounded ends and hav- 

 ing a space between them equal to about the width of 

 one of the lobes; a shallow median groove also extend- 

 ing along nearly the whole length of the segments as 

 indicated in the drawing (PL XXII, fig. 3). The space 

 between the lobes occupied by a small plate provided 

 with two slightly divergent appendages which scarcely 

 reach to the end of the abdomen. Abdominal segment 

 small, subquadrangular, concealed in dorsal view. 

 Caudal rami in the form of broad foliaceous plates 

 rather longer than broad, and having one marginal, 

 and three short, tolerably stout, spiniform setae. There 

 is also a small segment, intermediate between the 

 genital segment and a.bdomen, which is provided with 

 lateral uniarticulate and somewhat rudimentary appen- 

 dages, but this segment is seen only from the ventral 

 aspect. 



Antennules small. Antennas short and stout and 

 armed with strongly-hooked terminal claws. Mandi- 

 bles elongated and extremely slender, with a few 

 minute marginal setas near the tip. First maxillipeds 

 each furnished with a terminal and tolerably elon- 

 gated hook-like appendage and one or two short 

 accessory processes. Second maxillipeds short and 

 stout, but somewhat rudimentary in structure. Swim- 

 ming-legs all biramose ; both rami in the first pair 

 two-jointed, the first joint of the outer ramus consider- 

 ably expanded, and its outer distal angle reaching 

 forward to the middle of the short end joint and 

 terminating in a short stout spine ; the inner ramus 

 very small and the joints subequal. The fourth pair 

 large and foliaceous, each ramus about twice as long as 

 broad, and furnished with a few minute spines round 

 the distal end. Length exclusive of egg-strings about 

 20 mm.; egg-strings alone sometimes reaching to 80mm. 



We have not seen the male of this species. 



