46 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



HYPOCONCHA SPINOSISSIMA Rathbun 



Figure 14; Plate 10, Figures 1, 2 



Hypoconcha spinosissima Rathbtjn, Proc. Biol. Soc. Washington, vol. 46, p. 185, 

 1933 (type locality, off Cape Hatteras, N. C, 49 fathoms; holotype, ovi- 

 gerous female, U.S.N. M. no. 55957). 



Diagnosis. — One tubercle on either side of ventral surface of 

 carapace. Many spines on carapace, chelipeds, and other appendages. 



Description. — Carapace broader than long, short pubescent above, 

 hairy all over below, especially in the old; front subtruncate between 

 antennae; a short wide median fissure is followed by a shallow furrow; 

 anterolateral margin sinuous. Ventral surface granulate, granules 

 sparser on the carapace than on the appendages. Spines are dis- 



FiGUEE 14. — Hypoconcha spinosissima, female holotype (55957): Ventral view, enlarged. 



tributed as follows: Five or six at the angle of the margin of the 

 deflexed front; a longer spine where the epistome joins the front; a 

 strong, curved spine above and below the middle of the orbit; one or 

 two slender spines on a protuberance of the caropace in horizontal 

 line with buccal angle; three spines on carpus of cheliped; 9 or 10 

 spines on outer surface of manus, irregularly disposed in three rows; 

 a possible spine on outer surface at base of dactyl; a spine on coxa 

 and ischium of cheliped and first ambulatory. A row of short spines 

 and tubercles on border of epistome; a row of six or seven very 

 slender curved spines at outer angle of merus of maxilliped; an 

 elongate swelling lies just inside and parallel to the distal margin of 

 merus. 



Color. — Generally pinkish buflF, darker parts salmon color, fringing 

 hairs primrose yellow. 



