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ZETHUSINA SMITHIANA. 37 
Asthusina smithiana Fax. 
Plate VI., Fig. 2, 2. 
Bull. Mus. Comp. Zodl., XXIV. 160, 1893. 
In this species the carapace is a little longer than broad, and is not much 
narrowed anteriorly. The front is four-toothed, the middle pair of teeth 
large, triangular, separated from one another by a wide triangular sinus 
which is broader than the antennular sinus; between these teeth the margin 
is bent down till it meets the epistome below; the lateral teeth of the front 
are spiniform, and shorter than the middle teeth. The surface of the cara- 
pace is clothed with a short pubescence and is lightly granulous; the bran- 
chio-cardiac grooves are well marked. The postocular teeth are spiniform 
and they project far beyond the extremity of the small eye-stalks. The eyes 
are smaller than the extremity of their peduncles. The chelipeds are equal, 
smooth, naked, unarmed; the merus cylindrical, the carpus short and 
rounded ; the fingers about equal in length to the body of the chela, com- 
pressed, prehensile edges sharp and not provided with distinct teeth or 
tubercles. The ambulatory legs are nearly naked, the second pair more 
than twice the length of the carapace, the dactylus longer than the propodus. 
The last two pairs of legs terminate in short recurved claws, which are 
setose on the posterior edge. The sexes do not seem to differ in any marked 
degree. 
Length of carapace (male), 9.3 mm.; breadth, 8 mm. 
Station 3370. 134 fathoms. 3 fem. 
co 3380. 899 « 2 males. 
This species is nearly related to 4. abyssicola Smith, but its carapace does 
not so much diminish in width anteriorly, the external frontal spines are less 
developed, the external orbital spines are much longer, and brought forward 
so that the orbits face more to the front. From 2. challengert Miers it differs 
in the greater development of the frontal and external orbital spines. 
