NO. 1700. ON THE BARNACLES OF PERU—PILSBRY. 73 



The capitiilum has two or more rows of valves under the rostrum. 

 Valves and scales of the peduncle are reddish orange, the latter sym- 

 metrically arranged in close whorls. 



Family LEPADID^ Darwin. 



Genus LEPAS Linnaeus. 



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

 terga, terminating below in an embedded fork or external disk ; scuta 

 subtriangular, umbones at the rostral angle; caudal appendages uni- 

 articulate; peduncle long and nude. 



Common barnacles in all seas, on floating objects such as buoys, 

 driftwood, or ships' bottoms. Most of the species are almost world- 

 wide in distribution. The following key includes those likely to be 

 found on the Peruvian coast, though up to this time only two species 

 have actually been recorded. 



KEY TO SPECIES. 



fl\ Carina terminating below in a flat oblong external disk, umbo angularly pro- 

 jecting; valves thin, papery L. fascicularis. 



a'. Carina terminating below in a fork, umbo basal; valves well calcified. 

 &\ Valves radially furrowed or strongly striate. 



c\ Occludent margin of the scutum arched, protuberant L. anserifera. 



cc". Occludent margin close to the ridge from the umbo to the apex, 



L. pectinata. 

 b". Valves smooth or very minutely striate radially, 

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



right-hand scutum L. atiatifera. 



&. Valves not striate radially ; no internal umbonal teeth on the scuta, 



LEPAS ANATIFERA Linnaeus. 



19{yr. Lepas atiatifera LinniBus, Pilsbry, Cirripedia of the U. S. National 

 Museum, Bull. U. S. Nat. Mus. No. 60, p. 79, pi. 9, figs. 3-5. 



Locality. — Chincha Islands, abundant on bottoms of " lanchas " 

 (lighters) used in embarking guano (R. E. Coker). 



LEPAS PECTINATA Spengler. 



1907. Lepas pectinata Spengler, Pilsbry, Cirripedia of the U. S. National 

 Museum, Bull. U. S. Nat. Mus. No. 60, p. 81, pi. 8, figs. 4-8. 



Locality. — Peru, without special locality (Weltner). 



Genus CONCHODERMA Olfers. 



Nude cirripedes, with the peduncle long, capitulum generally 

 striped or maculate, with two to five small vestigeal widely sepa- 

 rated plates; scutum at base of the orifice, two or three lobed, with 

 the umbo near the middle on the occludent border; carina narrow 



