THE BAKNACLES IN THE U. S. NATIONAL MUSEUM. 79 



Subfamily OXYIST^^SPIDIJ^^E. 



Genus OXYNASPIS Dar\?vin. 



OXYNASPIS PATENS Aurivillius. 



1894. Ox}/naspis patens Aurivillius, Kongliga Svenska Vetenskaps-Akademien.^ 

 Handlingar, XXVI, No. 7, p. 38, pi. iii, figs. 1, 2. Near Anguilla Island. 



Locality.— C^it. No. 11533, U.S.N.M. Alhatross Station 2651, 

 Bahamas, north latitude 24° 02', west longitude 77° 12' 45", in 97 

 fathoms. 



Subfamily I^EP^^DIIN"^^:. 



Genus LEPAS Linnaeus. 



1758. Lepas Linn^us (part) Syst. Nat., 10th ed., p. 067." 

 1851. Darwin, Monograph on the Oirripedia, Lepadidse, p. 67. 



Valves 5, approximate; carina extending up between the terga, 

 terminating below in an embedded fork or external disk; scuta subtri- 

 angular, umbones at the rostral angle; caudal appendages uniarticu- 

 late (Darwin). 



Type. — Lepas anatifera Linnteus. 



Common in all seas on floating objects. The following ke}^ is slightly 

 modified from Hoek. 



KEY TO AMERICAN SPECIES. 



a. Carina terminating below in a flat oblong external disk, umbo angularly project- 

 ing; valves thin, papery L. fascicular is. 



aa. Carina terminating below in a fork, umbo basal; valves well calciiied. 

 h. Valves radially furrowed or strongly striate. 



c. Occludent margin of the scutum arched, protuberant L. ansenfera. 



cc. Occludent margin close to the ridge from the umbo to the apex. .i. p)ectinata. 

 bb. Valves smooth or very minutely striate radially, 

 c. Valves smooth or delicately striate; an internal umbonal tooth on the right- 

 hand scutum L. anatifera. 



cc. Valves not striate radially; no internal umbonal teeth on the scuta, .i. hiUii. 



LEPAS ANATIFERA Linnaeus. 



Plate IX, figs. 3, 4, 5. 



1758. Lepas anatifcraLisNJEVs, Syst. Nat., 10th ed., p. 668. 

 1851. Darwin, Monograph on the Cirripedia, I.epadidse, p. 73. 



This is our most abundant goose-barnacle on driftwood, etc. It 

 resembles L. hilln, but may be distinguished by the finely, faintly 

 striated valves, the presence of an umbonal tooth in the right scutum, 

 none in the left, and the proximity of the base of the carina to the 



« The genus Lepas was proposed by Linnjeus in 1758 to include both sessile and 

 stalked barnacles. Da Costa, in 177B, excellently defined the genus Balanus, thereby 

 removing the sessile forms from I/inna?us's group, and leaving it for the goose- 

 barnacles, for which the name Lepas has almost universally been reserved. 



