J;16 DB. J. G. DE MAN ON CEUSTACEA CHIEFLY 



as long as the merus, is 7-articulate ; the joints measure 032 mm., 0'22 mm., 0*54 mm., 

 0"36 mm., 0-3 mm., 22 mm., and 0'46 mm. ; the second and sixth the slaortest, the 

 third the longest. The chela, 0-88 mm. long, is almost as long as the last three carpal 

 joints together, and the fingers measure two-fifths the whole length of the chela. 



The following legs are slender. Those of the third pair project nearly with half the 

 propodites beyond the anteunal peduncles ; the meropodites, eleven times as long as 

 l)roa(l, carry on their outer surface a longitudinal row of 8 stout, movable spines, of 

 which the last is insened near the carpal articulation ; the lower margin of the 

 propodites is furnished with 9 movable spinules, which are smaller and thinner than 

 those of the merus ; the dactylus carries 6 sjiines on its lower margin, the last is stouter 

 than the terminal claw, so that the dactylus appears to terminate in two claws. The 

 following legs are gradually shorter ; the meropodites of the fourth carry 7, those of 

 the fifth 3 spines. 



The nearest allies of Spiront. propugmttrix are Spiront. stylus (Stimpson), Spiront. 

 gracilis (Stimpson), ard Spiront. amahilis, Lenz (confer E-athbuu, 'Decapod Crustaceans 

 of the North-west Coast of North America,' 1904). 



Spieontocaeis alcimede, de Man. (PL 32. figs. 42-46.) 



Spirnn/ocaris alcimede, de Mau, in Ann. & Mag. Nat. Hist. ser. 7, vol. xvii. 1906, p. 404. 



Twelve specimens from the Inland Sea of Japan. 



Closely related to Spiront. gracilis (Stimpson), and Spiront. fiexa, Rathbun, from the 

 North-west coast of North America, but apparently different. 



The largest specimen is 34 mm. long from the tip of the rostrum to the end of the 

 telson ; the abdomen, which is strongly geniculated at a right angle at the third segment, 

 is almost once and a half as long as the carapace (rostrum included). The slender 

 rostrum, the free part of which is once and a half as long as the remainder of the 

 carapace, arises with an obtuse crest at one-third of the length of the cej)halothorax 

 from its anterior border ; it projects at first horizontally forward, but is gently ascending 

 from the anterior tooth of the upper margin and the acuminate extremity just reaches 

 beyond tlie autennal scales. The upper margin, which is slightly arched above the 

 eyes, is armed with .5, rarely 4, pointed teeth, of which ttoo alivays stand on the carapace; 

 these teeth grow usually a little longer from the first to the anterior, so that they 

 cannot be said to be equidistant. The anterior tooth is situated in the middle of the 

 free part or immediately behind it, so that the terminal half of the upper margin 

 or someichat more appears devoid of teeth ; rarely the foremost tooth is situated in 

 front of the middle, in which case the terminal part, devoid of teeth, appears 

 somewhat shorter than the remainder. In front of the foremost tooth the upper limb is 

 very narrow and cannot be followed to the tip. The lower limb (PI. 32. fig. 43) is shallow, 

 convex, as in Spiront. unalaskensis, Eathbun, and Spiront. tridens, Eathbun, the width of 

 the rostrum at the base of the low^er margin being only -g-y of its whole length. The 

 lower limb, which gradually diminishes anteriorly, is armed with 6, 7, or 8, rarely 9, teeth, 

 which are smaller than those of the upper border, grow usually longer distally and reach 



