118 Proceedings of the Biological Society of Washington. 



near the middle; extremity cut into three slender spines, middle one 

 longest, widening; at its middle, lateral ones very slender, with an articu- 

 lating extremity. 



Eyes very large, not reaching end of antennular scale. Outer or upper 

 antennular flagellum shorter than inner which is shorter than peduncle. 

 Third maxillipeds reach to middle of last article of antennal peduncle; 

 dactylus suboval. Terminal joints of fourth and fifth pairs of thoracic 

 legs lanceolate; fifth pair extend to end of first third of antennal scale. 



The andricum increases in width distally, is much thickened at the 

 middle, very thin in terminal third where it forms three lobes on each 

 side, the distal one round, the next half as wide, the proximal one fili- 

 form . 



Relationships. — M. goodei (Smith) of the West Indian region and M. 

 pubescens (Stimpson) from St. Thomas, which may be identical, both 

 have a longer rostrum than our species, a spine at antero-inferior angle 

 of carapace and the abdominal carina begins on the second segment. 



Family XANTHID^. 

 Panopeus boekei sp. nov. 



Type. — Male, from Tumble-Down-Dick Bay, St. Eustatius, 15 fathoms, 

 stony bottom; September 17. 



Measurements. — Male, length 8.6 mm., width 13 mm., fronto-orbital 

 width 9.4 mm., front 4.4 mm. 



Description. — Carapace deeply areolated in anterior two-thirds, areoles 

 crossed by granulated rugae; surface finely granulated and covered with 

 scattered hairs of uneven length ; carapace convex in a longitudinal as 

 well as in a transverse direction, save for the four antero-lateral teeth 

 which are thickened and upturned ; teeth well separated ; first tooth short 

 and broad, convex; second tooth more prominent and equally wide, 

 posterior margin convex, anterior straight or slightly concave, tip blunt; 

 third tooth similar in shape, but longer, narrower and thicker; fourth 

 tooth narrow, triangular, acute, situated at widest part of carapace. 

 Front with a deep, narrow, median emargination, forming a rounded 

 lobe on each side, at the outer end of which there is a very small rounded 

 lobe. Across the front runs a transverse raised line fringed with long 

 hair. Preorbital angle prominent, blunt; lobe between the two upper 

 fissures of the orbit nearly transverse, slightly convex; lower margin 

 with a blunt inner tooth ; a V-shaped notch below outer angle. 



Larger cheliped much more massive than smaller. Merus short and 

 high, with a groove subparallel to distal margin and behind it a flattened 

 tooth on upper margin ; carpus rugose, with a distal furrow and a small 

 inner tooth ; manus granulate, granules reticulating, upper surface with 

 a shallow groove; fingers with rows of punctse, a groove on outside and 

 inside of immovable finger, and a groove near upper edge of outer surface 

 of dactylus; prehensile edges irregularly toothed, one of the larger teeth 

 at base of dactyl of larger chela ; fingers in this chela gaping moderately; 



