438 DR. J. G. DE MAN ON CEUSTACEA CHIEFLY 



Spenee Bate is also inaccurate, for (' Challenger ' Macrura, 1888, p. 259) he says " that one 

 small spiuule is visible on close inspection," whereas (p. 261) he describes three spinules. 



The autenuular flagella are of equal length and only one-thi)'d shorter than their 

 peduncle, i. e., the distance between its distal extremity and the anterior border of the 

 carapace ; the spine at the far end of the outer margin of the first joint of the peduncle 

 is slightly directed outward. 



There is only a minute spinule on the distal border of the lower surface of the basal 

 joint of the outer antennae. The peduncle reaches as far forward as the stylocerite of 

 the inner antennae, i, e. to the middle of the corneae, and the flagellum is a little more 

 than twice as long as the body. The outer margin of the antennal scales, which reach as 

 far forward as the antennular peduncles, appears very slightly arched ; tlie spine at the 

 distal end extends as far forward as the laminar portion, which in the specimen 78 mm. 

 long narrows a little more distally than in the other, an individual difference of 

 course. 



The external maxillipeds, of which the terminal joint extends beyond the antennal 

 peduncles, reaching almost to the middle of the scales, are described by Stimpson as 

 " nudi " on their outer surface ; in our two specimens they are, however, distinctly 

 hairy ; the exopodite reaches to the distal end of the merus-joint of the endopodite. 



The legs of the first and of the second pair are unispinose at base, their second joint 

 being armed with a spine ; the third legs, which reach to the tip of the antennal scales, are 

 unarmed. The slender legs of the fifth pair reach to the tip of the eyes or slightly 

 beyond them ; their dactyli are little more than half as long as the propodites. 



Both specimens seem to have copulated. The thelycum (PL 33. fig. 56) agrees with 

 Ortmann's and Kishinouye's figures, in the female 78 mm. long : the amorphous gum- 

 like substance with which it is covered resembles Kishinouye's figure 10 c ; but in the 

 other it has a remarkable shape, appearing as a narrow, asymmetric, shield-like hodij, 

 somewhat pointed at the distal end and divided by a transverse suture in the middle ; 

 it is of a whitish colour, whereas the lateral margins are of a pale violet (fig. 56). 



Carapace and abdomen marked with innumerable small dots or points of a dark, 

 perhaps bluish, colour; they are quite well visible in Spenee Bate's figure 1 of Fen. 

 anchoralis. 



Penceus anchoralis, Sp. Bate, was founded upon specimens from the Arafura Sea and 

 from Yokohama ; tho^^e from the latter locality ai-e no doubt identical with Fen. curvi- 

 rcstris, Stimps., those from the Arafura Sea certainly belonged to Pen. granulosus, Hasw., 

 but it is difficult to say whether Haswell's species, though most closely related to 

 Fen. curvirostris, is indeed identical with it or not. The second segment of the abdomen 

 of Fen. gramilosus seems to be destitute of the small crest near the centre of the ujiper 

 border which is cliaracteristic of curvirostris; the apex of the telson is acute, but not 

 developed into a spine as in the Japanese species, and finally the lateral margins should 

 be armed in Pen. granulosus only with a single, weak spine. The last named difference 

 explains perhaps the fact that Spenee Bate describes at one place the existence of one, 

 but at another page that of three spinules on the lateral margins of the telson. 



Dr. Alcock's suggestion that Fen. affinis (de Haan) = Fen. barbatus, de Haan, should 



