34 STALK-EYED CRUSTACEA. 



Stimps.* from Panama and Manzanillo ; and 0. stimpmiii Studer,t from near 

 Ascension Island, 60 lii thorns. The latter species appears to be very simi- 

 lar to, if not the same as, 0. tubcrosa. In the breadth of the carapace 

 O. lata shows a closer approach to Hepatus than the more typical species 

 of Osachila do. 



Family DORIPPID^. 



iETHUSA Eoux. 



Crustaces de la ilediterrauee, 4™' Livr., 1S30 [Ethusa']. 



iEthusa ciliatifrons Fax. 



Plate v., Fig. 3, 3% 3". 



BuU. Mus. Comp. Zool., XXIV. 159, 1893. 



Carapace broader than long, branchial regions much inflated ; surface 

 oranulated on the branchial and cardiac regions, pubescent on the gastric 

 reo^ion ; front and anterior part of the lateral border ornamented with 

 long up-turned cilia. Front between the orbits divided by a triangular 

 median sinus and two slightly shallower lateral sinuses into four triangular 

 teeth of equal length. The orbital sinuses are very deep, and the external 

 orbital angles reach as far forward as the frontal teeth, so that the front 

 margin of the carapace, viewed from above or from below, is cut into six 

 teeth of equal length. The dorsal surface of the carapace is deeply areo- 

 lated ; the branchio-cardiac lines are deeply impressed and meet in the 

 median line in front of the heart, cutting off the depressed cardiac area from 

 the gastric. The gastric region is uneven with pits and furrows. The eyes are 

 small, on very short peduncles, just reaching, when extended, to the pos- 

 terior angles of the orbital sinuses ; the eye is terminal, not wider than the 

 peduncles, and is provided with pigment of a black color. The chelipeds are 

 equal, small, and slender ; the chela is smooth and not more robust than the 

 carpus ; the fingers are longer than the palm, laterally compressed, curved 

 inward, longitudinally grooved, their prehensile edges straight and regularly 

 denticulated. The ambulatory limbs are very long (the second considerably 

 longer than the first), naked and granulated ; the propodus is slightly shorter 

 than the merus, slightly compressed, with a longitudinal groove on each 

 side ; the dactylus is one half longer than the propodus, laterally compressed, 



• Ann. Lye. Nat. Hist. N. Y., X. 114, 1871. 



t Crustacecu der Gazelle, p. 10, Plate I. Fig. 4 ; Abliandl. Koiiigl. Akad. Wisseiisch. zu Berlin, 1882. 



