94 BULLETIN IGG, UNITED STATES NATIONAL MUSEUM 



minute. Chelae slenderer than in challengeri, lower margin concave 

 until near proximal end of manus; manus of nearly equal width 

 throughout. Fingers longer than in the related species. Third and 

 fourth ambulatories slenderer than in challengeri. Abdomxen of 

 female broader in distal half than in that species, inner distal angle 

 of ischium of outer maxiUipeds more salient and merus more pear- 

 shaped. 



Measurements. — Female type, length and breadth of carapace 

 12.5 mm. 



Range. — Ofi west coast of Alexico. 



Material examined. — South of Gulf of Tehuantepec; lat. 10°14'00" 

 N., long. 96°28'00" W.; 2,232 fathoms; gn. M.; 35.8° F.; April 8, 

 1891; station 3414, Albatross; 1 female (M. C. Z. no. 4502). 



ETHUSINA GRACILIPES (Miers) 



Plate 30, Figure 4; Plate 31, Figure 4 



Ethusa {Elhiisiiia) gracilipes Miers, Voyage of H. M. S. Challenger, Brachyura, 

 vol. 17, p. 332, pi. 29, fig. 1 [not pi. 28, lig. 3], 1886 (type locality, near the 

 Philippines, 700 fathoms; type in British Mus.). — Alcock, An account of 

 the deep-sea Bracliyura collected bj^ the Royal Indian Museum Survey 

 Ship Investigator, p. 34, 1899. 



Ethusa {Ethusina) gracilipes var. robusta Miers, ibid., p. 333, pi. 29, fig. 2 (tj^pe 

 locality, Banda Sea, 1,425 fathoms; type in British Mus.). 



Aethusi7ia gracilipes Faxon, Mem. Mus. Comp. ZooL, vol. 18, p. 36, 1S95. 



Ethusina gracilipes Rathbun, Bull. U. S. Fish Comm. for 1903, vol. 23, pt. 3, 

 p. 891, 1906. 



Diagnosis. — Outer orbital spine oblique, much longer than frontal 

 spines and sometimes overreaching them. Basal article of antennules 

 bearing a small cUstal spine or tubercle. 



Descrijdion.- — Carapace finely and closel}^ granulated, longer than 

 broad, narrowed anteriorly; cervical and cardiaco-brancldal sutures 

 distinctly defined; front armed \vith four spines, the two median 

 separated by a somewhat wider and deeper interspace than that be- 

 tween the median and the outer spine; outer orbital spine strongly 

 developed; orbits incompletely defined. Eyestalks stout, tapering 

 to a smalJ cornea. Bases of antennules considerably dilated and 

 usually bearing a small distal spine or tubercle. Basal article of 

 antennae short, slender, not nearly reacliing front; flagcllum elon- 

 gated, reaching when retracted to posterior margin of carapace. 

 Chelipeds wdth merus subcylindrical, carpus very short, palm but 

 little longer than carpus, slightly compressed and shorter than the 

 fingers, which are grooved and meet along the slightly sinuous edges; 

 tips crossing. The compressed dactyli of the first and second ambula- 

 tories are deeply grooved, the second longer than the first and both 

 longer than their respective meri. 



