28; 



and the outer angles rounded. The rostrum, looked at from above, appears in the middle as 

 broad as the eyes. Orbital tooth acute, reaching to the distal si.xth of the rostrum and buttressed 

 by a sharp carina that first runs outward and then backward to near the spine of the 3''^' lateral 

 crest. Antennal tooth reaching beyond the rostrum and even beyond the eyes, buttressed also 

 by a lonu- sharp carina that is directed outward and that extends backward to the level 

 of the base of the rostrum; branchiostegal spine acute, very small, situated just below the 

 antennal spine. 



The rostrum of the female (Fig. 6(^d) has a ciuite different form and length. The rostrum 

 indeed, 0,74 mm. long when measured like in the male, reaches with the antero-external angles a 

 little beyond the eyes and the proportion between its length and that of the rest of the carapace 

 is like I :4,54; it is com])aralively less broad than in the male, the breadth in the middle 

 (0,4 mm.) being hardl\- more than half the length and the anterior margin is much 

 deeper emarginate, the antero-external angles being produced into two hornlike, slightly 

 upturned and divergent spines, the apices of w-hich are rounded. 



Without the rostrum the carapace appears a little, namely one-fifth, longer than 

 broad. Just behind the base of the rostrum the carapace is armed in the mid-dorsal line with 

 a well-developed, sharp spine, obliquely directed upward, of which the apex reaches to midway 

 the base of the spine and the level of the orbital margin; from this spine a prominent and 

 sharp carina runs backward in the middle line to the posterior margin and this carina appears 

 in a lateral view slightly convex in the middle, slightly concave anteriorly ; in front of the 

 spine it is continued almost to the middle of the rostrum. On either side of the middle the 

 carapace is provided with four sharp prominent carinae, of which the 2"'' and 

 the 3'''' end anteriorly in a sharp spine. The 1^' carina, which is unarmed, is very 

 short; it runs from the posterior margin forward, measures in the female one-fourth, in the 

 male one-fifth the length of the carapace, rostrum excluded, and appears in the female on 

 the left side a little shorter than on the right. The 2"<^ carina, situated about twice as far from 

 the lower border of the carapace as from the median carina and midway between the latter 

 and the 4''', runs in the female from the terminal spine, which is ])laced just behind the level 

 of the gastric spine and which is much smaller than it, fust slightly outward as far as the 

 cervical groove and then straight backward to the posterior border, not inward as in that 

 species; in the male, however, in which the terminal spine is as small as in the female, the 

 carina runs in a straight line o b 1 i q u e 1 \- b a c k w a r d and outward, with n o angle in 

 the middle; neither in the female nor in the male this carina is interrupted by the shallow 

 cervical groove, though it appears in a lateral view slightly concave above it. In the textfigure 

 B of Doflein's paper the larger posterior part of this carina is directed inward, not straight 

 backward or outward as in the present specimens, a slight difference perhaps of litde importance. 

 The spine of the 3"' carina, a little smaller than the gastric but larger than that of the 2"'', 

 is placed on the level of the gastric spine or slightly in front of it and midway between the 

 level of the orbital and the antennal spine; the carina runs from the spine first slightly downward, 

 then straight backward to the posterior border of the carapace, so that, in a lateral aspect of 

 the latter, the posterior extremities of the 2""^ and 3^'' carina appear a little less remote from 



