«7 



spine-shaped process on the lower margin at its posterior end (fig. 2/); the dorsal carina is 

 an almost oblong-triangular plate at the middle of the median line; the frontal plate (fig. ie) 

 is considerably produced, triangular, with the end acuminate and very acute. The eyes with tlie 

 upper section moderately developed, while the lower part is still in a rudimentary state both 

 as to cornea and inner visual elements. The first antennular joint (figs. 2 e and ig) with a long 

 outer process reaching considerably beyond the end of the next joint and bearing on the inner 

 margin a large number of spines very varying in length ; the inner flagellum still undivided, 

 naked, and considerably shorter than the peduncle. The antennal rami with some setse at the 

 end; the exopod somewhat shorter than the endopod and not yet developed as a squama. 

 F ig. 2 f shows that the maxillipeds (mxft.) and third pair of thoracic legs' are nearly rudimentary, 

 while the two anterior pairs of legs have the endopod much more developed and divided into 

 joints though still without setae. All five pairs of pleopods with sets on both rami. Sixth 

 abdominal segment (fig. 2J1) very long, almost longer than the sum of the two preceding 

 segments. Fig. 2 h shows the uropods and the telson, and fig. 2 i the distal part of the same 

 telson, with the spines characteristic of this stage of the present species; a special description 

 may be superfluous. — The other larva from Stat. 143 is a little smaller, with some of the 

 appendages a little less developed, but not showing anything of interest. 



5. TJiysanopoda Agassizii Ortm. PI. XIII, figs. 3^ — j,g. 



1894. Thysanopoda Agassizii Ortmann, Buil. Mus. Comp. Zool. Vol. XXV, N" 8, p. 99, Plate, 

 figs. 1 — 2. 



Stat. 66. May 7/8. Bank between islands of Bahuluwang and Tambolungan, south of Saleyer. 



8 — 10 m. Plankton. 1 very young specimen and 1 larva. 

 Stat. 203. September 19. Lat. 3°32'.5 S., long. I24°I5'.5 E. HENSEN vertical net, from 1500 m. 



to surface. 3 subadult specimens. 

 Stat. 243. December 2. Lat. 4°3o'.2S., long. I29°25'E. HENSEN vertical net, from 1000 m. 



to surface. 1 immature specimen. 

 Stat. 276. January 9. Lat. 6°47.5S., long. I28°40'.5E. HENSEN vertical net, from 750 m. 



to surface. 7 larvse. 



Description of subadult Specimens (figs. $ a — $ó). — The frontal plate is 

 moderately produced, triangular, with the sides a little sinuated, terminating in a short, laterally 

 compressed rostral process directed forwards and a little upwards. The upper surface of the 

 carapace is carinated along more than the anterior third, and this carina is somewhat behind 

 its anterior half suddenly a little higher, showing a less or more angular protuberance; less 

 than the front half of the carina has along each side a narrow excavation limited outwards by 

 a keel, and these two submedian keels are united with the median carina slightly behind the 

 rostral process. Along the lower lateral margin of the carapace runs an impressed furrow 

 anteriorly a little above, posteriorly gradually considerably more above, the lower margin ; the 

 latter has a small denticle a little before its posterior end; the sides of the carapace have no 

 vertical or oblique grooves. The eyes of very moderate size, black. The first peduncular joint 

 of the antennulse has from its inner distal part of the upper side a large lobe, which at the 

 base is highly raised, somewhat more than half as broad as the end of the joint and furnished 



