3§ 



S. Paulsoni Kossmann, from the Red Sea, but as the latter species has been established on a 

 single female, it is impossible, at least without a new examination of the type, to say anything 

 on differences between it and 5". inornata or S. media; I am apt to think that it may be 

 impossible to recognize S. Paulsoni before both females and males have been taken together 

 in the Red Sea and redescribed together with the type-specimen. 



19. Siriella media n. sp. PI. IV, figs. 3^ — ^k. 



Stat. 16. March 15/16. Lat. 6° 59' S., long. 6° 59' N. Bay of Kankamaraan, S. coast of Kangeang. 



22 m. Vertical net, with electric light. 21 specimens. 

 Stat. 37. March 30/31. Sailus ketjil, Paternoster-islands. 27 m. and less. Plankton, surface. 



15 specimens. 

 Stat. 4.1. April 3. Lat. 7°25'S., long. ii7°5o'E. 96 m. Plankton, surface, 3 specimens. 

 Stat. 109. June 5/6. Anchorage off Pulu Tongkil, Sulu-Archipelago. 13 m. Plankton. Numerous 



specimens. 

 Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. 27111. Plankton. 1 specimen. 

 Stat. 132. July 25. Lat. 5°56'.7N., long. I26°25'E. 3302 m. Plankton, surface. 2 specimens. 

 Stat. 172. August 26/28. Gisser, anchorage between this island and Ceram-Laut. 18 m. Plankton. 



1 specimen. 



Description. — It is so closely allied and similar to S. inornata that I had confounded 

 both species until long after I discovered the strong differences between their furniture with 

 modified setre on the fourth pair of male pleopods. The frontal plate has its acuminated part 

 a little more produced than generall)- in 5. inornata. The eyes are perceptibly smaller than in 

 the latter species. The antennal squama in the female (fig. 3^) somewhat less than three and 

 a half times, in the male (fig. 3a) not quite three and a half times, as long as broad, with the 

 terminal lobe only a little more than half as long as broad. 



Fourth pair of male pleopods with the rami subequal in length ; the endopod, the distal 

 part of which is shown from the outer side in fig. 3/, terminates in two strong, moderately 

 long, acute and considerably curved, spiniform setae, the outer with some short, fine hairs beyond 

 the middle and a little shorter than the inner which is naked; the penultimate joint has at its 

 distal inner angle a slender, naked, straight, spiniform seta about as long as the joint, and at 



Siriella serrata n. sp. 



Description of the Male. — Similar to S. inornata, but at once distinguished from that form and from every other species 

 of the genus by having the outer margin of the antennal squama furnished with spines. The frontal plate about as long as S. inornata, 

 with the end acute but not acuminated. Eyes a little smaller than in S. inornata, black. Antennular peduncles moderately robust, distinctly 

 thicker than in i'. inornata. Antennal squama not fully three and a half times as long as broad, with the terminal lobe a little more 

 than half as broad again as long; the distal outer denticle well developed, and the outer margin along its distal two-thirds with 4 or 5 

 articulated. moderately long spines. Pseudobranchial rami of second to fourth pairs of male pleopods spirally twisted. Rami of fourth pair 

 of male pleopods equal in length ; the exopod terminates in a single very long and strong, blunt spine more than one-fourth as long as 

 the ramus; endopod with the four distal joints of normal length, but very sharply marked off from each other, its last joint terminating 

 in an extremely long and strong, blunt spine, nearly half as long as the ramus, and the three preceding joints each with a long and strong, 

 blunt spine directed much downwards. Rami of third and fifth pairs of pleopods normal. Exopod of the uropods a little longer than the 

 endopod, not quite as slender as in 5. inornata; proximal joint of the exopod with 12 spines occupying more than two-thirds of the 

 margin; distal joint somewhat less than twice as long as broad. Telson with the distal half of the margins slightly concave, reaching 

 slighüy beyond the articulation of the exopod, and as to shape and spinulation agreeing with that of S. inornata. — Length of the 

 single adult male 10.5 m. 



Locality. -- Suez. The specimen described has been captured by Mr. H. Mortensen (March 21, 1898) and belongs to the 

 Copenhagen Museum. 



