THE SPIDER CRABS OF AMERICA 



93 



tubercle either side of cardiac spine; margin of branchial region 



tuberculate. Hepatic region steep, a granulate ridge running down 



to a laminate tooth on the margin. A triangular ptery^gostomian 



tooth. 

 Front very short, formed of two rounded lobes separated by a 



narrow cut. The antennular cavities extend nearly to the extremity 

 of the front and are separated by a partition 

 developed inferiorly in a triangular tooth. 

 Eyestalks short, with a flat upper surface, a 

 tubercle on the anterior margin and another 

 at the extremity in the emargination of the 

 cornea. The postocular tooth is small and 

 easily broken off; it is thin and, at its origin 

 a little behind the orbit, is laid close to the 

 carapace; it is directed first forward and then 

 outward, close to the eye; viewed from behind 

 it is subtriangular, viewed from below it is 

 narrower. Basal article oFantenna very deep, 

 with a prominent crest below, which near the 



Fig. 2.^.-aepinvs septemspiso- anterior end bifurcates, the longer, outer 

 sus (15165), MAxiLLiPED, X 9.8 branch continuing to epistome where it 



terminates in a lobe. The exognath of the maxillipeds has a tooth 



on its outer margin. 



Chelipeds slightly enlarged ; longitudinal lines of granules or small 



tubercles on margins and between; palm narrow; fingers gaping 



slightly in their basal half in male, the propodal finger hollowed out 





Fig. 29.— Aepinus septemspikosvs, male (1516.5), left chela, 3.3 mm. long 



in the gape. Merus, carpus and propodus of ambulatory legs a little 

 thickened at middle; dactylus very slender, slight!}^ curved and hairy 

 with below a row of minute spinules. 



The sternum of the male has a very prominent crest connecting 

 the coxae of the chelipeds; and four minor crests opposite the ambu- 

 latory legs; in the younger and less developed males the sterna} 

 segments have transverse lines of granules. Abdomen of old 

 female coarsely pitted, terminal portion tubercidate, a smooth 

 median carina; in the smaller females the abdomen is granulate, 



