192 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



ILIACANTHA SCHMITTI Rathbnn 



Figure 42; Plate 83, Figures 1, 2 



Iliacantha schmitti Rathbun, Proc. Biol. Soc. Washington, voJ. 48, p. 2, 1935. 



Type locality. — Gorgona Island, Colombia; 150 fathoms; Hancock 

 Galapagos Expedition; 1 ovigerous female (69259). 



Diagnosis. — Rostral teeth triangular, acute. Posterolateral spines 

 thin, connected by a narrow margin visible from above. 



Description. — Ovigerous female. Carapace nearly as broad as long 

 to base of posterior spine and rostral spines. Surface covered with 

 fine, close set granules, invisible to naked eye except at posterior end. 

 Rostrum prominent, with two triangular, acute teeth, which are convex 

 from side to side and from front to back, overreaching the eyes and 

 deeply separated from each other by a triangular sinus. A deep 

 groove above the pterygostomian channel. Anterolateral angle far- 

 ther forward than in hancocki and tipped with a minute tooth or spine. 

 Posterior margin of carapace beneath the median spine, transverse, 

 visible from above, slightly convex in outline and with a large flat 



Figure ^2.— Iliacantha schmitti, male: Outline of carapace, natural size. 



triangular tooth at either end. Merus and ischium of outer maxilli- 

 peds with a fringe of hair along the lengthwise elevation. Palms not 

 compressed. Fingers one and one-half times as long as upper margin 

 of palm and armed with long, slender teeth interspersed with short 

 ones. Dactyls of ambulatories with two rows of hair on upper surface. 



Color. — In alcohol, mainly orange-yellow, rostral end red. 



Measurements. — Length, measured between frontal teeth to base 

 of posterior median spine, 31, width of carapace 28.8 mm. 



Range. — Colombia; Ecuador; 10 to 150 fathoms. 



Material examined. — See table 63, p. 195. 



Genus CALLIDACTYLUS Stlmpson 



Callidactylus Stimpson, Bull. Mus. Comp. Zool., vol. 2, p. 157, 1871 (type, C. 

 asper Stimpson). 



Carapace rounded, nearly as broad as long, regularly convex except 

 near the anterior margins; hepatic region well defined, protuberant, 

 and toothed; posterior half of carapace with seven spines. Front 



