43 



Descri ption. — Shape of the body, frontal plate, eyes, male antennular peduncle, 

 gnathopods, thoracic legs and pseudobranchial rami quite as in S. anomala. Antennal squama 

 in the male (hg. 2 a) quite different from that in the male 5". anomala, but almost as in the 

 female of this species; it is not quite three and a half times as long as broad, with the terminal 

 lobe more than half as long as broad. Third pair of male pleopods with both rami equal and 

 terminating in plumose set?e. Fourth pair of male pleopods (fig. 2 ö) with the endopod conspi- 

 cuously longer than the exopod and terminating in three modified setse ; terminal joint (fig. 2 e) 

 with the outer seta very strong, naked, longer than the sum of the four proximal joints but 

 not fully twice as long as the inner, strong, naked, somewhat curved seta; penultimate joint a 

 little elongated, with its outer terminal seta normal and plumose, while the inner seta is naked, 

 less strong but considerably longer than the inner seta of the terminal joint. Uropods of the 

 male almost as in S. anomala-, the exopod conspicuously longer than the endopod, with 10 — 12 

 spines on the outer margin of the proximal joint (fig. 2a?), while the distal joint is scarcely 

 as slender as in S. anomala, two and a half times or slightly more as long as broad. Telson 

 of the male (fig. 2 e) nearly as in S. anomala, but the distal half a little broader with the 

 margins straight. 



Length of the male 10.5 mm. 



Remarks. — The male of this species is easily distinguished from that of .S. anomala 

 by the normal shape of the antennal squama and by not having the terminal part of the 

 endopod of third pair of pleopods modified ; from the male of 5. conformalis it is separated 

 by a very different development of the two outer distal setse on the endopod of fourth pair 

 of pleopods. But as to the females the matter is different, as the only character between this 

 sex of S. inornata and S. distinguenda seems to be, that the distal joint of the endopod is a 

 little less slender in the latter than in the former species. As is seen in the lists of stations of 

 both species, a single male of S. distinguenda was found among a large number of males and 

 females from Stat. 37 of 5. anomala, but I did not feel justified in separating any female from 

 that station as belonging to 5". distinguenda, while I am sure that the females taken together 

 with two males of S. distinguenda and several males of S. anomala at Stat. 41, all belong to 

 the latter species. But I think that the material, four females, from Stat. 125 belongs to S. 

 distinguenda. As to the difference between the females of 5. distinguenda and S. conformalis 

 I refer to the "remarks" on the latter species. 



23. Siriella conformalis n. sp. PI. V, figs. T,a — 36". 



Stat. 220. November 1 3. Anchorage off Pasir Pandjang, west coast of Binongka. 278 m. 

 Plankton. 7 specimens, males and females. 



Description. — Very closely allied to i'. anomala and especially to S. distinguenda. 

 The frontal plate is a broad, rather low triangle with the apex acute but scarcely or not acuminated, 

 the oblique anterior margin at each side of the apex nearly straight, scarcely or not concave. 

 Eyes as in the species mentioned. Antennal squama similar in both sexes, about as in the male 

 of S. distinguenda. Pseudobranchial rami nearly as in 6'. anomala. Third pair of male pleopods 



