186 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



between tbe bases of the peduucles of the aDteDute, where it is closed 

 iu below by the inaudibiilar palpi, and separates either side of the lab rum 

 into the passages from the branchial chambers. 



Solenocera siphonocera Miers. 



FeiKvus memhranaceus M. -Edwards, Hist. Nat. Crust., ii, p. 417, 18:17 (uon 



Risso ?). 

 Peneits siphonoceros Pbilippi, Archiv Naturgesch., vi, p. 190, pi. 4, tig. 3, 1840. 

 Penmis siphonocervs Heller, Crnst. siidlichen Europa, p. -29.'), ])1. 10, fig. 12, 



1863. 

 Solenocera siplionoar a Miors, Proc. Zool. Soc. Loudon, 1878, p. 301, 1878. 

 Solenocera memhranacca Bate, Ann. Mag. Nat. Hist., V, viii, p. Id4, 18dl. 



Albatross collection, Gulf of Paria, station 2121, February 3, 1S84, 

 north latitude 10° 37' 40", west longitude 01° 42' 40", 31 fatlioms, mud, 

 temperature 67°. Three females. 



I can find no characters by which to distinguish these American speci- 

 mens from the Mediterranean species as described and figured by Phil- 

 ippi andHeller, although a direct comparison might show them to be of 

 a distinct species. 



The entire surface of the earapax and pleon is naked and glabrous. 

 The earapax is slighi^y compressed laterally, and a little narrowed in 

 front. There is a broad and shallow hepatic sulcus, and the cervical 

 sulcus is very deep, reaches to the middle of the dor.vum, where it slightly 

 notches the dorsal carina, and is bordered posteriorly by a sharp and 

 slightly carinated margin. There is a distinct supraorbital tootli, the 

 antennal spine is stout and dentiform, the inferior angle ends in an acute 

 spine about as large as the hepatic, and back of the orbit and above the 

 antennal spine there is a large, prominent, and acute spine. Back of 

 the cervical sulcus the dorsal carina is prominent and sharp nearly to 

 the posterior margin, and in front it rises rapidly iu a liigh crest termi- 

 nating iu the nearly straight rostrum, which is rather high, stronglv 

 compressed at base, and regularly tapered to an acute tip, and which 

 is armed above nearly to the tip with four to six teeth, besides two to 

 four upon the dorsal crest back of the orbit. 



The eyes are black, large, swollen, approximately hemispherical, and 

 very slightly flattened above. 



The tube formed by the flagella of the antennulne is a little longer 

 Ihan the earapax including the rostrum, and its diameter about th»t of 

 the penultimate segment of the antennular peduncle. The antennal 

 scale is approximately half as long as the earapax including the rostrum, 

 and more than a third as broad as long^. The antennal flagellum is 

 slender, subcylindrical, and at least twice as long as the rest of the 

 animal. 



The proportions of the perreopods are sufficiently indicated in the 

 accompanying table of measurements. 



The third, fourth, fifth, and sixth somites of the i)leon are dorsally 

 carinated, the carina is sharp and high on the last three somites, and 



