Genus Callinectes. 671 



CALLINECTES ORNATUS, nov. sp. 



Carapax evenly convex, not quite so broad as in hasia' 

 tus, and with the areolations not so distinctly marked as 

 to prevent the carapax from having a smooth, even ap- 

 pearance. The cardiac and intra-medial regions are nar- 

 row and elongated. Granulations of the carapax nearly 

 the same as in hastatus, except that they are rather more 

 thickly scattered. 



Front prominent, four toothed. The outer teeth conical 

 and obtuse, the two inner ones small, almost rudimentary. 

 Sub-median tooth longer and more narrow than in hasta- 

 tus. Teeth of the antero-lateral border very broad, with 

 strongly convex and somewhat granulated sides. The in- 

 terior angle of the lower margin of the orbit somewhat 

 prolonged into a rounded obtuse tooth. The pterygosto- 

 mian region is pubescent, although it is quite difficult to 

 determine to what extent, from alcoholic specimens, in 

 which the hair is often worn off. I have, however, a small 

 female in which the whole pterygostomian region is pu- 

 bescent. The pubescence may decrease with age, being 

 worn off by the rubbing of the chelipeds, or gradually dis- 

 appearing at successive moultings. 



The sternum is quite flat, and its first segment and the 

 episternal pieces of the first segment are different from 

 those of hastatus. The abdomen of the male is quite nar- 

 row; the penultimate segment has its sides slightly and 

 regularly concave ; the antepenultimate segment narrows 

 much more rapidly than in hastatus. The intromittent or- 

 gans are straight and short, reaching to the middle of the 

 penult segment of the abdomen. The abdomen of the 

 female is not so broad as in hastatus, only covering the 

 last segment of the sternum, and is much narrower ante- 

 riorly, so that it has a more triangular appearance than 

 that of hastatus. 



