4 I2 



of the visible part of first antennular article and is continued as a low, rounded ridge that 

 at the end of the corneae already passes into the surface of the body and that is separated 

 from the orbital hoods by narrow and shallow grooves. The rostrum of A. Bouvicri is described 

 by Coutière as "une crête bien distincte, s'étenclant au dela des voütes", while in A. Bastardi 

 the orbital hoods are not separated by grooves from one another (Coutière, Alpheidae Mald. 

 and Laccad. Archip. 1905, p. 908). As regards the orbital region and the frontal margin, 

 A. leviusculus resembles A. Bouvicri (Coutière, 1. c. 1905, fig. 44). 



Second antennular article hardly twice as long as thick, little longer than the visible part 

 of the first, while this visible part is but little longer than the third article. Stylocerite ending 

 in a spine that is directed inward and that just projects beyond the first antennular article. 



Spine of the basicerite very small. Carpocerite as much longer than the antennular 

 peduncle as in A. Bouvicri and A. Bastardi. The scaphocerite, the outer margin of which is 

 straight, reaches to the tip of the antennular peduncle; the terminal spine that measures just 

 one-fourth the length of the scaphocerite, extends backward to the anterior end of second 

 antennular article and projects beyond the tip of the blade by one-fourth of its length, farther 

 therefore than in A. Bastardi; the blade is probably less broadened distally than in this species. 



Telson 3-times as long as the posterior margin is broad, the latter a little more than half 

 as broad as the greatest width; the inner spines near the postero-lateral angles half as long as 

 the posterior margin is broad and extending with more than half their length beyond the tip. 



Merus of large chelipecl 3-times as long as broad distally, armed with a small, acute 

 tooth at the far end of its infero-internal margin. Chela resembling that of A. Bouvieri and 

 A. Bastardi, 3-times as long (7,5 mm.) as high (2,5 mm.), fingers half as long as the palm, 

 the margins of which are nearly parallel ; as regards the notches on both margins and the 

 form of the depressions on the outer and on the inner face of the palm, the chela also agrees 

 with the two cited species. Merus of the small cheliped resembling the other, with a very small 

 tooth at the end of the infero-internal margin; the chela agrees with Dana's figure 3^/, but the 

 fingers are slightly longer than the palm and the chela is almost 5-times as long as high. 



The carpal segments of the 2 nd legs are 1,32 mm., 0,7111111., 0,32111111., 0,3111111. and 

 0,54 mm. long, the second segment 3, 5-times as long as thick; the chela is 0,96 mm. long 

 (palm 0,46 mm., fingers 0,5 mm.). Proportion between the first and the second segment 1,9 

 and the first segment is just as long as the sum of the three following; in Dana's specimen it 

 was a little shorter. 



Merus of 3 1 ' 1 legs 5-times as long as broad, the propodus, which is 8-times as long as 

 broad and armed with 7 spines, is one-fifth longer than the carpus and measures five-sevenths 

 of the merus; the dactylus, finally, measures one-fourth of the merus and little more than one- 

 third of the propodus. 



Remarks. This species is certainly different from A. Bouvicri, but will perhaps once 

 prove to be identical with A. Bastardi Cout. ; Dana's name lias then, however, the priority. 



A. levmsculus Spence Bate (Report Challenger Macrura, p. 549, PI. XCVIII, fig. 1) 

 seems to be a different form. 



General distribution: Wakes Island, North Pacific (Dana). 



