FISHERY BULLETIN: VOL. 75, NO. 2 



Roberts and Pequegnat 1970:31, fig. 3-1D. 

 Pequegnat and Roberts 1971:8. Crosnier and 

 Forest 1973:253, fig. 85e-f, 87c, 88b, 89c. 



Material 



UNITED STATES— Florida: 5 6 3 9, RMNH-UMML, 

 SW of Marquesas Keys, 1,373-1,428 m, 1 December 1964, Gerda 

 stn 449. 2 d , USNM, SW of Marquesas Keys, 948-969 m, 

 29 August 1967, Gerda stn 858. 2 6 , TAMU, NW of Dry Tortu- 

 gas, 3,256 m, 29-30 July 1968, Alaminos stn 68A7-4E. 1 6, 

 TAMU, SW of Cape San Bias, 1,097 m, 1 August 1968, Alaminos 

 stn68A7-7B. Alabama: 1 6, USNM, off Mobile Bay, 2,160 m, 

 3 March 1885, Albatross stn 2383. Texas: 1 9, TAMU, off 

 Padre I, 1,399 m, 7 August 1969, Alaminos stn 69A11-7. 



MEXICO— Tamaulipas: 1 9, USNM, off Boca de San 

 Rafael, 1,668 m, 24 January 1970, Oregonll stn 10881. Vera- 

 cruz: 1 6 3 9, TAMU, NE of Tuxpan, 1,326 m, 24 August 1969, 

 Alaminos stn 69A11-83. 1 6, TAMU, Bahia de Campeche, 

 2,122 m, 16 August 1969, Alaminos stn 69A11-44. 



BAHAMA ISLANDS— 1 6 paratype, YPM 4557, Tongue 

 of the Ocean, "Wire 7000 feet" [2,134 m], 2 March 1927,Pou;nee 

 stn 11. 6 holotype 1 9 paratype, YPM 4556, Turks I Passage, 

 1,646-1,728 m, 12 March 1927, Pawnee stn 54. 



JAMAICA— 1 9, USNM, W of South Negril Point, 1,591- 

 1,829 m, 8 July 1970, Pillsbury stn 1238. 



EASTERN CARIBBEAN— 1 6 6 9, USNM, S of I Aves, 

 1,249 m, 27 January 1884, Albatross stn 2117. 



COLOMBIA— 10 d69, USNM, NW of Peninsula de la 

 Guajira, 1,500 m, 27 July 1966, Pillsbury stn 454. 3 9, USNM, 

 off Peninsula de la Guajira, 2,500 m, 27 July 1966, Pillsbury 

 stn 455. 



Description. -Rostrum (Figure 10) slightly to 

 rather strongly upturned, reaching as far as distal 

 margin of second antennular article, its length 

 about 0.45 that of carapace, and with both margins 

 almost straight. Rostral plus epigastric teeth 7-8, 

 sharp; epigastric tooth located at about 0.4 cl from 

 orbital margin, first tooth (largest of all) at about 

 0.25, and second with apex at level of orbital 

 margin; ventral teeth absent. Adrostral carina 

 low and sharp, extending from orbital margin 

 almost to apex of rostrum; orbital margin project- 

 ing anteroventrally in narrow shelf. Postrostral 

 carina strong to just caudal to cervical sulcus, 

 from there weak or indistinct porteriorly, and fol- 

 lowed by minute tubercle located close to margin 

 of carapace. Spines on lateral surface of carapace 

 slender and sharp: postorbital spine situated 

 directly posterior to antennal, and branchio- 

 stegal, largest of all, continuous with short, sharp 

 carina; pterygostomian spine absent. Cervical 

 sulcus deep, extending to, but not crossing, post- 

 rostral carina, its dorsal extremity placed at about 

 0.54 cl (or slightly farther anteriorly) from orbital 

 margin; hepatic sulcus biconvex ventrally, run- 

 ning from base of hepatic spine to ventral end of 



branchiocardiac sulcus; weak posthepatic carina 

 extending posteriorly from junction of latter sulci. 

 Branchiocardiac sulcus long, accompanying ca- 

 rina strong. Submarginal carina slender. 



Eye (Figure AC) with basal article produced 

 mesially into small scale. Cornea comparatively 

 narrow, its greatest diameter approximately 1.5 

 times that of base of ocular peduncle (1.25-1.75, 

 x 1.55; N = 20), and proportion of diameter to 

 carapace length varying between 10.0 and 12.5, 

 x 11.1. Cornea hemispherical, with proximal 

 margin subperpendicular to longitudinal axis of 

 elongate ocular peduncle; an imaginary line 

 drawn parallel to base of ocular peduncle at level 

 of its mesial tubercle intersects lateral border far 

 proximal to cornea. 



Antennular peduncle length equivalent to 

 about 0.5 that of carapace; prosartema short, ex- 

 tending only as far as distomesial margin of cor- 

 nea, falling short of distal margin of first anten- 

 nular article, but with long distal setae reaching 

 base of second antennular article; stylocerite 

 moderately long, extending 0.60-0.65 of distance 

 between its proximal extremity and mesial base of 

 distolateral spine; latter rather long, slender, and 

 sharp. Antennular flagella long and unequal in 

 length, ventral one 2.25 times as long as carapace 

 in shrimp 17.5 mm cl; dorsal flagellum longer 

 than ventral, unfortunately incomplete in all 

 specimens examined. Scaphocerite length approx- 

 imately 3.65 times maximum width, overreaching 

 antennular peduncle by as much as 0.3 of its own 

 length; lateral rib ending in slender spine extend- 

 ing to, or slightly surpassing, distal margin of 

 lamella. Antennal flagellum long, at least 6.8 

 times total length of shrimp: male with total 

 length of 45 mm bearing incomplete flagellum 

 300 mm long. Mandibular palp, maxillae and first 

 two maxillipeds similar to those inH. debilis (see 

 Figure 5). Third maxilliped overreaching anten- 

 nular peduncle by length of dactyl and propodus 

 or by their lengths plus 0.1 that of carpus; length 

 of dactyl about 0.7 that of propodus. 



First pereopod, stoutest of five, reaching about 

 distal end of carpocerite. Second pereopod over- 

 reaching antennular peduncle by, at least, tip of 

 dactyl, or by as much as length of propodus. Third 

 pereopod exceeding antennular peduncle by 

 length of propodus and, at most, 0.4 that of carpus. 

 Fourth pereopod overreaching antennular pedun- 

 cle by length of distal three podomeres. Fifth 

 pereopod exceeding antennular peduncle by 

 length of distal three podomeres, or by length of 



276 



