172 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Solenocera, but the length given would indicate a very much larger spe- 

 cies than the Solenocera. It is perhaps best to drop the name membra- 

 naceus entirely, or at least until it can be shown with some degree of cer- 

 tainty to what species it really applies. 



Parapenaeus politus. 



Penceus politus Smith, Proc. National Mus., iii, p. 444, 1881. 



Several specimens, agreeing well with the single one originally de- 

 scribed, were taken in 1881 by the Fish Hawk, off Martha's Vineyard, 

 in 79 to 128 fathoms, and in February, 1884, a large number were taken 

 by the Albatross, in 31 to 34 fathoms, in the Gulf of Paria. 



The species is closely allied to P. longirostris, and some of the speci- 

 mens from the Gulf of Paria have the rostrum much longer than any 

 of the northern specimens and approach the Mediterranean species so 

 closely that it is quite possible that a large series of specimens might 

 show that the politus is only a variety of P. longirostris. All the spec- 

 imens seen, however, are easily distinguished from the longirostris by 

 the shorter rostrum, which falls much short of the tips of the antennal 

 scales, and by the somewhat smaller eyes. 



Parapenaeus megalops, sp. nov. 



This species is closely allied to P. longirostris and politus, but is at 

 once distinguished from them by the broader carapax, the more numer- 

 ous teeth upon the rostrum, the very much larger eyes, and by the 

 branchiostegial spine being on, instead of a little way back from, the 

 anterior margin of the carapax. 



The surface of the carapax and pleon fs naked and smooth. The car 

 apax is about as broad as high and very little compressed anteriorly. 

 The antennal, hepatic, and branchiostegial spines are well developed, 

 the latter forming the antero inferior angle of the carapax. From the 

 hepatic spine a sharp elevation extends backward aiid upward, marking 

 the posterior margin of the cervical suture, but fades out before reach- 

 ing the dorsum, which is evenly rounded posteriorly but rises in front 

 in a carina armed with a single spine in the middle of the gastric re- 

 gion far back from the crowded teeth of the rostrum proper, only one 

 or two of the most posterior of which are back of the orbit. The 

 rostrum is a little shorter than the carapax proper, reaches to the tips 

 of the antennal scales in all of the females seen, but falls short of them 

 in the males, is nearly horizontal or considerably arched upward in the 

 middle, is rapidly narrowed vertically from the base to about the middle 

 of the eyes, beyond which it is slender and gradually tapered to an 

 acute tip, and the dorsal edge is armed with twelve to fifteen spiniform 

 teeth which are crowded posteriorly but become gradually more and 

 more remote and smaller toward the tip, to which they very nearly reach. 



The eyes are black, reuiforin, flattened above, and very large, ap- 

 parently slightly larger in the males than in the females 5 the greatest 



