2 19 



f„_ Anterior tooth or tubercle of the anterior moiety of the sub- , 



dorsal carapacial crest not very large, not much larger 

 than the posterior rostral spines. 

 g^ Posterior moiety of i^^ or dorso-lateral crest ending anteriorly 

 in a sharp spine or tooth. 

 The two parts into which the anterior moiety of the 4''^ or 



lateral crest is divided, are both produced into acute spines spinicauda A. M.-Edw. 

 (A. Milne-Edwards, I.e., 1881, p. 3 and I.e., 1883, Plate 39, figs, i, \a.) 



^3 Posterior moiety of 3"^ or dorso-lateral crest obtuse anteriorly. 



h^ Distance of the anterior tubercle of the 2"'^ or subdorsal 



crest from its fellow about twice as long as the distance, 



measured in the middle line, between the line unitinsf 



these two tubercles and the line uniting- the two rostral 



spines of the posterior pair Sibogae de Man 



h„ Distance of the anterior tubercle of the 2^^ or subdorsal 



crest from its fellow about three times as long- as the 



distance, measured in the middle line, between the line 



uniting these two tubercles and the line unitinof the two 



rostral spines of the posterior pair. 



Of the two parts into which the anterior moiety of the 



4"^ or lateral crest is divided, the part in front of the 



notch is produced anteriorly to form a spine, while the 



part behind the notch merely forms a projecting angle 



or shoulder. 



2j Upper surface of the rostrum transversely corrugated. 



Tubercles of the dorsal and subdorsal crests of the 



carapace very prominent and spiniform vicaria Faxon 



<\V. Faxon, in: Bull. Mus. Comp. Zool. at Harvard College, Vol. XXX, N" 3, 

 Cambridge, Mass., 1896, p. 159, footnote.) 



^3 Upper surface of the rostrum not transversely corrugated. 

 Tubercles of the dorsal and subdorsal crests of the 



carapace not very prominent nor spiniform .... megalophthalma de Man 

 ^2 Anterior moiety of the 4'** or lateral crest broken into two 



tubercles, the posterior of which is the more prominent . sicaria Faxon 

 <\V. Faxon, I.e., 1S95, p. 144, PI. XXXIX.) 



^2 Anterior moiety of the 4''' or lateral crest of the carapace continuous 

 with the branchiostegal spine, undivided. 

 Anterior moiety of the 3''^ or dorso-lateral crest of the carapace 



continuous with the orbital spine neglecta Faxon 



(W. Faxon, I.e., 1896, p. 159, PI. 1, figs. 5, 6.) 



