436 BE. J. G. DE MAN ON CEUSTACEA CHIEFLY 



This species is characterized by all the rostral teeth standing upon the free part 

 of the rostrum, there being none on the carapace. Of the eight teeth, the first, whicli 

 is situated upon the anterior border of the carapace, appears a little smaller than the 

 two following ; these are also larger than the rest, which slightly decrease in size 

 distally; the anterior tooth is about once and a lialf as far distant from the tip of the 

 rostrum as from the penultimate. 



A longitudinal fissure proceeds from the anterior border of the carapace, immediately 

 above the antennal sjiine, backAvard, and extends along two-thirds of the length of the 

 carapace ; it was first described by Kishinouye. There is also a third transverse suture 

 at the level of the third pair of legs. Stridulating-organs wanting. 



The rather obtuse carina of the fourth segment of the abdomen arises at one-seventh 

 of its length from the anterior extremity. The telson is not " about half the length of 

 the lateral plates of the rhipidura," but measures about two-thirds their length, the 

 basal joints included. The furrow on the upper surface reaches little beyond the middle 

 of the telson. 



The stylocerite of the inner antennae reaches not quite so far forward as the antennal 

 peduncle, which extends to the middle of the cornese ; the antennular peduncle is 9 mm. 

 long, the flagella 7"2 mm. The basal joint of the antennal peduncle carries a spine at 

 the outer angle ; the spine at the distal end of the very slightly arcuate outer margin 

 of the scale reaches not quite to the rounded extremity of the laminar portion. The 

 flagellum is almost twice as long as the body. 



The external maxillipeds, which project with their terminal joint beyond the antennal 

 peduncles, reach to the middle of the scales. 



The legs of the third pair extend to the distal extremity of the antennal peduncles 

 and are unarmed at base, and those of the fifth reach just beyond the rostrum, to the 

 terminal third part of the scales. (See additional Note B on page 454.) 



Geographical BisMhution. — Bay of Kobe, Japan {Spence Bate) ; Inland Sea of Japan 

 and along the lower half of this Empire {Kisldnouye) ; Maizuru, Japan {Orimann). 



Pen^us (TuACHYPENiEUs) cuRViKOSTRis, Stimpsou. (PI. 33. figs. 56-58.) 

 PetKEvs curvirostris, Stimpson, in Proc. Acad. Nat. Sciences Philadelphia, 1860, p. 44. 

 PeruEus curvirostris, Ortmanu, in Spengel, Zool. Jahrb., Sj'st. v. 1890, p. 451, Taf. 36. fig. 4 a, b. 

 Penceus curvirostris, Kishinouye, in Jouru. Fish. Bureau, Tokyo, vol. viii. no. 1, 1900, p. 23, pi. 6. fig. 4. 

 Parapenmus curvirostris, Rathbun, in Proc. U.S. Nat. Mus. xxvi. 1902, p. 38. 

 Trachypenmus curvirostris, Alcock, in Ann. & Mag. Nat. Hist. ser. 7, vol. xvi. 1905, p. 523. 

 Penceus anchoralis, Spence Bate, ' Challenger ' Macrura, 1888, p. 258, pi. 35. fig. I (partim ?). 



Two females from the Inland Sea of Japan, caught in deep water. 



They are nearly equally long, one measuring 80 mm., the other 78 mm. from the tip 

 of the rostrum to the end of the telson. In both specimens carapace and abdomen are 

 tomentose and scabrous with short adjacent setae and microscopical spinules ; the setae are 

 0-15-0-16 mm. long, the spinules 0-03-0-04 mm. The lower margin of the rostrum, 

 which reaches to the distal end of the second joint of the antennular peduncle, is distinctly 

 curved in its ascent upwards and fringed with long cilia. In the female, which is 

 80 mm. long, the upper margin is 1 + 7-toothed; the gastric or first tooth, which is 



