102 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
coral, sana, station 6074; off Vieques, 12 to 16 fathoms, coral, stations 6001, 6092, 6093; off Huma^acr, 
9J to 121 fathoms, stations 6097, 6098, 6099. Previously collected at Orange Bluff, Clearwater Harbor, 
Florida, 1 to 2 fathoms (H. Hemphill, coll.); Marco, Fla. (H. Hemphill and U. S. Fish Commission); 
St. Thomas (Albatross) ; Gulf of Paria, 31 fathoms (Smith, type locality). 
Parapenaeus megalops Smith. 
Parapenivus megalops Smith, Prop. IJ. S. Nat. Mus., vn, 172, 1885. 
Surface of carapace and pleon naked and smooth. Median carina extending only half-way back 
on carapace; gastric spine remote from rostral teeth. Rostrum elevated, arched, terminal half very 
slender; armed with from twelve to fifteen dorsal spiniform teeth crowded posteriorly, but becoming 
more and more remote and smaller near tip; rostrum reaching to tips of antennal scales in females, 
shorter in males. Antennal, hepatic, and branchiostegal spines well developed. No antennal suture. 
Eyes extremely large, extending laterally beyond carapace. Antennal peduncles extending not so far 
beyond eyes as length of eyes; terminal segment longer than penultimate. Median carina of fourth to 
sixth segments of pleon thin and sharp; telson with a lateral as well as two dorsal car i me. 
Dimensions of female: Length from tip of rostrum to tip of telson, 140 mm.; length of carapace, 
including rostrum, 54 mm.; length of rostrum, 25 mm. 
Taken in Mayaguez Harbor in 220 to 225 fathoms on rocky bottom, station 6070. Off South 
Carolina, 159 fathoms, station 2314 (Albatross) ; off Habana, 213 fathoms, station 2350 (Albatross); Gulf 
of Mexico, 196 fathoms, station 2399 (Albatross) ; off St. Kitts, 208 and 250 fathoms, Wale stations 147 
and 148 (Faxon); off Grenada, 159 fathoms, Blake station 258 (Faxon); off Barbados, 218 to 288 fathoms, 
Wale stations 275, 281, and 283 (Faxon); south of Curacao, 208 fathoms, . ilbnlross station 2125 (Smith); 
Gulf of Darien, 155 fathoms, Albatross station 2143 (Smith). 
Parapenaeus americanus, sp. nov. Plate 2. 
The carapace shows the fissures characteristic of P. fmurns (Bate) 1 and P. invest) gat oris, 
Anderson, 2 namely, a linear longitudinal fissure on either side running from the orbit to the posterior 
margin, and a short transverse fissure crossing branchial margin just above the second pair of feet. 
Our species is so closely allied to P. inrestigatoris that it may prove to be a subspecies of it. It differs 
as follows: Branchiostegal spine on anterior margin instead of behind it. The rostrum reaches just to 
end of first joint of antennulary peduncle and in small specimens falls short of it. The rostrum slopes 
upward at a greater angle than in P. investigatoris for its proximal two-thirds; distal third horizontal, 
not deflexed. Sixth abdominal segment only a little more than twice the fifth in length. Inner 
branch of antennulary flagellum only three-fourths the length of carapace, exclusive of rostrum. 
This species is in some respects intermediate between P. investigatoris and P. Jissnrus; as in the 
length and breadth of the sixth abdominal segment and in the length of the antennulary flagella. The 
position of the branchiostegal spine is as in P. fissurus. 
Dimensions of female: Length, 68.5 mm.; length of carapace, including rostrum, 22 mm. 
The type specimens, a female and 3 smaller imperfect females, were taken in the trawl in Maya- 
guez Harbor, 220 to 225 fathoms, rocky, station 6070 (Cat. No. 23783). 
Genus XIPHOPENEUS Smith. 
Xiphopeneus Smith, Trans. Conn. Acad. Soi., n, 27, 1869. 
Fourth and fifth pereiopods very long, the propodi multiarticulate and flagelliform. Mandibular 
palpus two-jointed, the distal segment much larger than proximal. Endognath of first maxilla short 
ami unsegmented. Fourteenth somite without branch i;e. Antennular flagella longer than carapace. 
Xiphopeneus kroyeri (Heller). 
Penieus kroyeri Heller, Site. Ber. Acad. Wiss. Wien, xi.v, 1 Abth., 425, pi. n. f. 51, 1862. 
Xiphopeneus harttii Smith, Trans. Conn. Acad. Sci., ii, 28, pi. i, i. 1. 1869. 
Xiphopeneus kroyeri. Smith, Proc. IT. S. Nat. Mus., vin, 188, 1885. 
Cervical and branchio-cardiac sulci very distinct, together forming a nearly straight groove from 
near base of antennae almost to posterior border. Rostrum very long and slender, equaling or exceeding 
1 Challenger Rept., Zool., XXIV, 263, pi. xxxvi, f. 1, 1888. 
2 Ann. Mag. Nat. Hist. (7), in, 279, 1899; 1 1 1 u . Zool. Investigator, Crustacea, part VII, pi. xi.r, figs. 1, la, 16. 
