^THUSINA SMITHIANA. 37 



^thusina smithiana Fax. 

 Plate VI., Fig. 2, 2\ 



Bull. Mus. Comp. Zool., XXIV. 100, 1S93. 



Ill 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 spiniforra, 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 e^'es 

 are smaller than the extremity of their peduncles. The chelipeds are equal, 

 smooth, naked, unarmed ; the merus cylindrical, the carpus short and 

 rounded ; the lingers 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. 

 " 3380. 899 " 2 males. 



This species is nearly related to ^. abi/ssicola Smitli, 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 ji^J. chaUcngeii Miers it differs 

 in the greater development of the frontal and external orbital spines. 



