430 DE. J. G. DE MAN ON CRUSTACEA CHIEFLY 



meri of the third j)air are 10 25 mm. lonj? and 1"9 mm. broad, 5^ times as long as broad ; 

 those of the fourth pair are 7'5 mm. long and ITS mm., broad ; those of tlie fifth are 

 6-75 mm. long and 1 mm. broad. 



The ova are very numerous and small, 0"6-0'62 mm. long and somewhat less broad. 



The red upper surface of the body is marked yfiih symmetrically arranged spots and 

 striae of a vrhite colour, but the fourth segment of the abdomen is adorned on either side 

 Tpith a dark red-bvoion s2)ot, which is quite characteristic. The red inner surface of the 

 larger chela with a few large white flecks near the npjier and lower borders ; similar 

 flecks occur also on the inner surface of the palm of the smaller chela, and its fingers are 

 almost entirely white. 



The ova-bearing female from tlie river near Pare-Pare, Celebes (de Man, in "Weber, 

 Zool. Ergebn. 1892, ii. p. 404), was also examined by me, and seemed to belong to the 

 same species as the two females from the Inland Sea of Japan. Its size is a little 

 smaller, the upper surface of the telson is a little more rounded, and, in consequence 

 of its smaller size, the rostral crest is not continued so far backward ; but otherwise 

 there are no differences. 



Alpheus japonicus, Miers. (PI. 33. fig. 53.) 



Alpheus japonicus, Miers, in Proc. Zool. Soc. 1879, p. 53. 



Alpheus japo7ucus, Ortmann, in Spengel, Zool. Jahrb., Syst. v. 1890, p. 476, Taf. 36. fig. 14. 



Alpheus longhnanus, Spence Bate, Report on the ' Challenger' Macrura, 1888, p. 551, pi. 98. fig. 4. 



Two males from the Inland Sea of Japan and one egg-bearing female without 

 definite locality, but no doubt also from the Inland Sea. This Prawn is common in 

 8-15 fathoms. 



The two male specimens are 45 mm. long; the female 40 mm. from the tip of the 

 rostrum to the end of the telson. 



The sharp-pointed rostrum is little shorter than the visible part of the first joint of 

 the antennular peduncle and extends horizontally forward. The second joint of the 

 antennular peduncle is about once and a half as long as the visible part of the first, and 

 the third is shorter than the first ; the flattened and broad stylocerite ends distally in a 

 sharp spinule, which reaches almost to the distal end of the first joint of the antennular 

 peduncle. Tiie small spinule on the basal joint of the antennal peduncle is placed on 

 the distal edge of its lower surface, and is therefore not visible from above. The antennal 

 scale, the outer margin of which is slightly concave, is as long as the peduncle of the 

 inner antennae and a little shorter than that of the outer. The telson, the lateral 

 maro-ins of which are slightly prominent in the middle, carries two pairs of spinules. 



The external maxillipeds are a little shorter than the antennal peduncles ; according 

 to Spence Bate, they should extend to a little beyond them. 



In both male specimens the left cheliped is the larger. The infero-internal margin 

 of the merus is fringed with hair and terminates in a sharp tooth ; the iufero-external 

 maro-in is very finely denticulate, and its upper border ends also in a sharp tooth. The 

 larger chela, which is a little more than three times as long as broad, agrees with the 

 quoted descriptions and figures ; the fingers are little more than half as long as the palm. 



