164 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



NALICORA RAPAX Moore. 



Nalicorarapax Mooke, Bull. U. S. Fish Commission, XX, Pt. 2, 1902, pp. 169-170, 

 pi. IX, figs. 11-22. 



Localities. — Mayaguez Harbor, Porto Rico; Gulf of Mexico; lati- 

 tude 29° 11' 30" north, longitude 85° 29' west; latitude 28° 46' north, 

 longitude 84° 49' west; latitude 29° 16' 30" north, longitude 85° 32' 

 west; between delta of the Mississippi and Cedar Keys, Florida, 

 Dfpth.—lh-nh fathoms. 



"" Body convex, about 2.3 times as long as broad, first thoracic seg- 

 ment longest, next live about two-thirds as long and subequal, last 

 shorter; posterior four thoracic segments with a row of setfe across* 

 middle and another on posterior margin, hairiness increasing posteri- 

 orly, occasionally a few setw on second and third. Fifth segment 

 broadest. 



"Pleon and tclson about two-tifths as long as rest of body. Pleon 



of four visible segments, first short and nar- 

 rower than second and third and hidden at 

 side by seventh thoracic; second somewhat 

 produced at posterior lateral angle; third 

 segment strong!}" produced, angle reaching 

 to beyond base of uropods. 



" Epimera of all the thoracic segments 

 except the tirst distinct, of second and 

 third not produced posteriorly^ the follow- 

 ing ones successively more produced, the 

 last two terminating in strong angles. 



" First antennae about as long as pedun- 

 cle of second antenna?; peduncle of two 

 equal joints, tiagellum slightly longer than peduncle, about eight or 

 nine jointed; distal ends of segments furnished with a few short hairs; 

 second antenna^ reaching to end of second thoracic segment; peduncle 

 five- jointed, fifth joint longest, slightly exceeding the fourth, which is 

 as long as first tliree joints together. 



'■'Mandil)le weak, with bifid cutting edge and three-jointed palp. 

 First maxilhi large, rolnist; plate of first joint expanded at distal end 

 into a some\\ hat tjuadrate curved face closely beset with papilhv and 

 looking like a triturating plate; third joint very stout, strongly curved 

 with a ver}' strong terminal spine continuous in contour with the rest 

 of the joint; at base of curved portion, on inner side, a stout knob- 

 like protuberance. The first maxilla is the largest and most conspicu- 

 ous of the mouth parts, overlapping and hiding the mandible, and in 

 the male I'eaching to the base of the antenntv. In the female the ter- 

 minal spine is straighter, not so continuous with the rest of the plate, 

 and ])oints inward and somewhat l)ackward. Second maxilla four- 



FiG. 146.— Nalicoka RAPAX. a, Sec- 

 ond MAXILLA. X 51f. h. Outer 



LOBE OF FIRST MAXILLA. X 51|. 



