20I 



d^ Terminal spine of scaphocerite shorter than the antennular 



peduncle. 



e^ Lateral spine of basicerite not yet reaching to the middle of 



median antennular article, terminal spine of the scaphocerite 



not yet extending to the middle of third article ; fingers of 



the smaller chela hardly shorter than the palm, the proportion 



to the total length being as i : 2,25 nephmus (Dana) 



(J. D. Dana, U.S. Explor. Exp. Crustacea, p. 553, PI. XXXV, fig. 5. — Confer 

 also: H. COUTIERE, in: Proc. U.S. Nat. Mus. XXXVI, 1909, p. 87— 89, fig. 53). 



e„ Lateral spine of basicerite reaching the apex of median anten- 

 nular article, terminal spine of scaphocerite extending to the 

 distal 3''^ part of third antennular article ; proportion between 

 the leng-th of the fingers of small chela and the total length 



too o 



as I : 2,7, the fingers shorter than in Syn. nephmtis . . . Theano de Man 



d„_ Terminal spine of scaphocerite much longer than the antennular 



peduncle and even slightly reaching beyond the carpocerite. 



Lateral spine of basicerite not yet reaching to the apex of 



median antennular article. Proportion between the length of the 



fingers of the small chela and the total length as i : 2,5 ^) . laticeps Cout. 



(H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. S74, PI. LXXII, fig. 11). 



fj Carpocerite 9-times as long as wide. Anterior pair of spinules of 



the upper surface of the telson arranged in a regular quadrate, 



rather far distant from the lateral margins. Terminal spine of 



scaphocerite a little shorter than antennular peduncle, outer margin 



of scaphocerite very concave, blade rudimentary, reaching to the 



middle of median antennular article. Antennular peduncle 6-times 



as long as wide. Ova large, 1,46 mm. long Antenor de Man 



b„ Superior spine of basicerite extraordinarily large, half as long as the 

 lower that almost reaches to the middle of median antennular article. 

 Median part of the posterior margin of telson extremely narrow, less 

 broad than the lateral parts, spinules of the upper surface very large. 

 Small chela as in Syni. laticeps Cout Pescadorensis Cout. 



Remarks to the preceding keys. 



To the Ncomej'is group also appertains Syn. inei'ospiniger Cout. (Bulletin Soc. Philom. 

 Paris, 1 90S, p. 5). The place of this species in the key is uncertain, because nothing is known 

 about the length of the ventral or principal hook with regard to the length of the dactyli 

 that are bin ngui cul a te. Merus of third legs spiniferous. The ventral or principal hook 

 is hardly thicker than the other and its margins are curved: through this character this 

 species may easily be distinguished from those of the section a^ (5^, to which it belongs. 



i) This number has been deduced from the figure \\a in Couti£re's paper. 



69 



