NO. 2135. NEW PHILIPPINE CRABS—RATHBUN. 535 



On tlie sternum of the female there is a spine at the base of the 

 cheliped and of the first leg, three spines in a triangle in front of 

 the abdomen, and several spinules. Abdomen covered with spines 

 and spinules. 



0. echinata can be distinguished from all other species by the 

 numerous spines and spinules of the carapace, abdomen, and basal 

 joint of antenna. The carapace is much narrower than that of C. 

 murrayi,^ which it most nearly resembles. 



ACHiEOPSIS SULUENSIS, new species. 



Type-locdlitrj. — Tawi Tawi Group, Sulu Archipelago: Tinakta 

 Island (N.), N. 82° W., 1.4 miles; lat. 5° 11' 50" K; long. 119° 54' 

 E.; 10 fathoms; co. S.; Feb. 21, 190S; station 5159, Albatross. 



IIolotype.—FQmixl^. Cat. No. 48203, U.S.N.M. 



MeasureTTients. — Length of carapace to end of rostrum, 3.7; width 

 of carapace, 3.3. 



A very broad, subtriangular species, rostrum short, hepatic region 

 laterally prominent and situated not far behind the eye. Two large, 

 flat-topped, median spines, one gastric, one cardiac; a small tubercle 

 on posterior slope of latter. Margins of hepatic and branchial re- 

 gions denticulate or spinulous. A row of pterygostomian tubercles. 

 Rostrum divided into two short triangular teeth. Supraorbital 

 margin raised, very oblique, entire. Behind it are two small spinules, 

 the second of which represents the postocular spine. 



Eye-stalks long and rather slender, a small tubercle at end above, 

 a broad tubercle on anterior margin and a narrower, sharper one 

 below and nearer the base. Basal antennal segment very narrov*' 

 and in ventral view very oblique. ^ 



The feet are so interlaced and so brittle that they can not be 

 measured. Palms twice as long as broad and dilated at middle. 

 First ambulatory leg missing; second leg about twice as long as 

 carapace; last one about 6 mm. long; in all the dactylus is long and 

 very slender, nearly straight in its proximal two-thirds, slightly 

 curved at the extremity. 



Each of the six segments of the female abdomen has an acute 

 tubercle at the middle. 



Relationship. — In the large median spines this species suggests 

 A. superciliaris Ortmann- from Japanese waters, but that species 

 has other dorsal spines which are lacking in ours, and the rostrum 

 and orbital region are more elongate. 



iMiers, Challenger Rppt., Zool., vol. 17, ISSG, p. 1."), pi. .'?, fig. 1. 

 2 Zool. Jahrb., Syst,, vol. 7, 1S93, p. 3G, pi. 3, figs. 3, 3o. 



