132 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



tudinal row of setiferous granules at lower third; above this the sur- 

 face is granulate and setose, below it the surface is smooth and bare 

 down to a row of tubercles on lower edge; fingers slender, closing 

 together, outer margins granulate and setose, prehensile margins very 

 finely denticulate. 



First and second legs narrow, with 

 straight dactyli and not very un- 

 equal; third and fourth legs of 

 stouter build, dactyli short, very 

 stout, short-pointed; merus of third 

 with anterior border convex and pu- 

 bescent, posterior border tubercalate ; 

 fourth leg very small, reaching to 

 end of merus of third. 



Between second and third seg- 

 ments of abdomen there is a row of 

 hairs which lie flat on the second 

 segment ; some of third to sixth seg- 

 ments usually partly fused; end of 

 abdomen from middle of sixth seg- 

 ment suddenly enlarged, end seg- 

 ment semicircular. 



Sexual variation. — Female larger, 

 carapace more swollen, frontal region more inclined, dorsal and 

 antero-lateral ridges weaker, posterior margin wider, fingers longer, 

 appendages more setose. 



Color. — Violet; abdomen of male ash-colored, of female golden- 

 yellow (Milne Edwards and Lucas). 



Fig. 74. — Pixnixa transversalis, 

 outer maxilliped of femalb 

 (4044G), X 16J. 



-pinnixa tnansvbr.salis. o, abdomen 

 e, enlarged ; 6, uigut chelil'ed, en- 

 ( After Faxon.) 



Fig. 7G. — Pi.nxixa transversalis, 

 abdomen and sternum of male, 

 enlarged. (after milne ed- 

 WARDS AND Lucas.) 



Measurements.— M2A.Q (20625), length of carapace 4.7, width of 

 same 9.7 mm. Female (40446), length of carapace 8, width of same 

 1G.5 mm. 



Habitat. — In tube of annelid resembling Chaetopterus (Coker). 



