438 DE. G. S. BEADY ON NEW OE 



cones with terminal rosettes of short olfactory (1) setse, a second pair (b) consisting each 

 of two coalescent cones, a third (c) longer and finger-like with crenated margins. The 

 mandible (fig. 23) has four long terminal ungues and a short seta ; its chewing-lobe 

 (fig. 23 «) is setose and ends in two slender mucrones ; and the antepenultimate joint 

 bears, like Cijpridina, a short apical process with a lancet-shaped point and two lateral 

 setse (fig. 23 b). Lateral setse of the vermiform limb few, generally not more than 

 eight; terminal seta long, filiform, not at all tooth-like, unilateral (fig. 25). Post- 

 abdominal laminae (fig. 26) bearing nine pectinated marginal ungues, which are 

 progressively longer from first to last. 



Hab. Taken abundantly in the surface-net in the Bay of Bengal, lat. 14° N. For 

 these specimens I am indebted to my friend Mr. I. C. Thompson, F.L.S., of Liverpool. 



Genus Saesiella Norman, 1869. 



Sarsiella Normau (i), p. 293; Brady & Norman (i) ( ? ), p. 677. 

 Nematohamma Brady & Norman (i) {S), P- 680; G. W. Muller (i), p. 213. 



Saesiell.\ hanseni, sp. n. (Plate XLV. figs. 1-12.) 



Shell of the female, seen from the side (fig. 1), subquadrate, height equal to four- 

 fifths o'f the length ; anterior extremity very wide, truncate, slightly irregular, but 

 almost straight, posterior narrower, deeply excavated, and bounded above and below 

 by two prominences, the lower of which is much the largest and forms a stout sub- 

 triangular beak ; dorsal margin slightly arcuate, somewhat sinuous, highest in the 

 middle, whence it slopes very gently towards the front, but steeply aud with a distinct 

 curve backward, ventral margin more strongly convex and sinuated in front of the 

 posterior beak. Seen from above (fig. 2), the outline is elongated and subquadrangular, 

 of nearly equal width throughout, width equal to more than half the length ; anterior 

 extremity wide, flattened, but deeply emarginate in the middle, posterior almost as 

 wide as the greatest width of the shell, abruptly truncated and slightly prominent in 

 the middle; lateral margins subparallel, very slightly divergent from behind forward, 

 almost rectangular at their junction with the posterior extremity, but rounded ofl' in 

 front. The substance of the shell is flexible and submembranaceous, closely pitted 

 with small impressed puncta and irregularly waved and ribbed ; the anterior and inferior 

 margins form a continuous elevated ridge ; two longitudinal ribs run parallel to, but 

 at a considerable distance within, the dorsal and ventral margins ; there is a fiexuous 

 central rib between these two, rising near the front of the valve, and becoming lost 

 behind the middle ; between this and the dorsal rib is another rib which begins with 

 a sharp bend in front of the middle, and, gradually becoming stronger, passes back- 

 ward and ends in a curve a little within the posterior margin. Between these principal 

 ribs the valves are irregularly corrugated ; all the ribs are beset with long and rather 



