THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 99 



Nude civripedes, with the peduncle long, capitulum generally striped 

 or maculate, with two to five small vestigeal widely separated plates; 

 scutum at base of the orifice, two or three lobed, with the umbo near 

 the middle on the occludent border; carina narrow arched, with the 

 two ends nearly alike, umbo near the middle; sometimes it is wanting; 

 terga small or, in adults, sometimes wanting. Lateral filaments 

 numerous; mandibles with five finel}'^ pectinated teeth; maxillae with 

 distinct steps. Caudal appendages none. Cirri with the spines 

 arranged comb-like. 



Type. — C. virgatum. 



These pelagic forms live on whales' " bonnets," turtles, the bottoms 

 of ships, buoys, etc. The two species are nearly or quite world-wide 

 in distribution. C. virgatum is a handsomely striped form, with the 

 plates rather well developed, though small. C. auritum is readily 

 known by the two large "ears" rising behind the positions of the 

 terga. The terga and carina are very small, sometimes absent in 

 adults. 



CONCHODERMA VIRGATUM (Spengler). 

 Plate IX, tig. 1. 



1790. Lepas virgata Spengler, Skrifter Naturh. Selskabet, I, pi. vi, fig. 9. 



1851 . Conchoderma virgata Darwin, Monograph on the Cirri pedia, Lepadidre, p. 146. 



1883. Conchoderma virgatum Hoek, Challenger Eep., Cirripedia, p. 55. 



Localities. — Swansea, Wales, Jefi:'reys collection. No. 1623, Woods 

 Hole, Massachusetts, U. S. Fish Commission. No. 12905, Woods Hole, 

 Massachusetts, on bottom of ship from Swan Island, Caribbean Sea. 

 Twelve miles southeast of Block Island, Rhode Island. Ofl: Gay Head, 

 Marthas Vineyard, on Mola rotunda., U. S. Fish Commission. No. 

 12013, Albatross Station 2713, between Nantucket and Cape Charles, 

 on JVeptunus sayi. No. 14139, Gloucester, Massachusetts, on bottom 

 of ship from Mediterranean. No. 4272, San Francisco, California. 



CONCHODERMA AURITUM (Linnaeus). 

 Plate IX, tig. 2. 



1851. C aurita Linnaeus, Darwin, Monograph on the Cirripedia, Lepadidte, p. 141. 

 1872. Otion stimpsoni Dall, Proc. Cal. Acad. Sci., IV, p. 301. 



Localities. — Atlantic: Swansea, Wales, Jeffreys collection. Woods 

 Hole, Massachusetts, on bottom of a bark from Swan Island, Carib- 

 bean Sea. Cape Hatteras, from an iron buoy. 



Bering Sea: Plover Bay, Siberia, on Coronula diadmna from the 

 throat of a humpback whale. W. H. Dall, 1865. 



The specimens from Plover Bay, eastern Siberia, are those Doctor 

 Dall referred to" as blotched with rose pink. They were taken from 

 a humpback whale (Jlegaptera versahilis Cope) captured by Captain 

 Redfield. I have seen no specimens from the coast of California. 



"Proc. Cal. Acad. Sci., IV, 1872, p. :W1. 



