THE CANCROID CRABS OF AMERICA 281 



Measurements. — Male (14847), total length of carapace 63.4, 

 width of same 93, fronto-orbital width 27.3, width of front 13.8 mm. 



Range. — Peru; Chile. 



Material examined. — 



PERU.— Salavery; October 22, 1926; W. L. Schmitt; 3 males, 

 3 females (2 ovigerous) (60967). 



Callao; May 18, 1908; R. E. Coker collector; received from Peru- 

 vian Government; 1 male (40412). 



Callao; specimens in Paris Mus. 



San Lorenzo Island; January, 1884; Dr. W. H. Jones, U. S. Navy; 

 1 ovigerous female (13864). 



Pisco Bay; specimens in Paris Mus. 



Peru: Dr. W. H. Jones, U. S. Navy; 3 males, 1 female (14847, 

 46331). W. E. Curtis; 8 specimens (12552). 



PLATYXANTHUS CRENULATUS A. Milne Edwards 



Plate 116. fig. 1; Plates 117-119 



Platyxanlhus crenulatus A. Milxe Edwards, Bull. Soc. Philom., ser. 7, vol. 3, 

 1879, p. 106, pi. 2, fig. 1 (type-locality, Patagonia; type in Paris Mus.). 

 Not P. crenulatus Rathbun, Proc. U. S. Nat. Mus., vol. 38, 1910, p. 540, 

 except figure copied from A. Milne Edwards. 



Diagnosis. — Carapace nearly smooth; four antero-lateral lobes or 

 teeth. Merus of outer maxillipeds as broad as lo;:;;-, anterior margin 

 oblique. Dark coloi^ almost covering dactylus of chelipeds. 



Description. — Regions feebly indicated. Surface covered with 

 small separated granules. An oblique raised granulated line on the 

 hepatic and on the epibranchial region, parallel to each other. Two 

 similar transverse parallel lines on each protogastric region, the 

 posterior shorter and further from the median line than the an- 

 terior; while these granulated lines are distinct in small and medium 

 specimens they disappear in the old. Antero-laterat borders occupy 

 half the length of carapace and are cut by three V-notches into two 

 lobes and two teeth; the first two lobes are subequal in extent, edges 

 crenulate, the crenules deeply divided in the young, obscure in the 

 old; the first lobe is transverse for half its length and confluent with 

 the orbital angle which is dentiform in the youug, not so in the old ; 

 third and fourth prominences dentiform, subacute, the third pro- 

 jecting sideways beyond the line of the preceding lobe and bearing 

 a denticle or tw^o at the posterior end of its outer margin. A line of 

 coarse granules runs obliquely inward from tip of last tooth. Post- 

 lateral margin nearly straight. Four frontal teeth subequal, tuber- 

 culiform, separated by U-shaped sinuses, median sinus narrow, outer 

 sinuses very wide. Inner supra-orbital tooth triangular; orbital 

 fissures deep; of the two inferior, rounded teeth the outer is the smaller 

 and more advanced than outer angle of orbit, the inner tooth is 



