THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 103 



Heteralepas quadrata (Aiirivillius), from Lower California, on Lepm^ 

 is the only species of this genus hitherto reported from the west coast 

 of North America. It was described as an Alejxis, and is known to me 

 by the original account only. 



HETERALEPAS (PARALEPAS) PERCARINATA (Pilsbry). 



1907. Alepas percarinata Pilsbry, Bulletin of the Bureau of Fisheries, XXVI, 

 p. 185, pi. IV, fig. 8. 



Localities. — This Hawaiian species is represented by specimens from 

 Alhatross stations 4081, 4082, 4083, 4084, all off the north coast of Maui 

 in 202 to 267 fathoms; Station 3835, south coast of Molokai, 169 to 182 

 fathoms, and Station 3912, north coast of Molokai, 334 fathoms. The 

 bottom temperature ranges from 43° to 55° F. These stations are 

 additional to those mentioned in the original description. 



Genus ALEPAS Rang. 



1829. Alepas Sander Rang, Manuel de I'histoirenaturelle des Mollusques, p. 364, 



for A. parasita Rang (May, 1829). Not Alepas of subsequent authors. 

 1894. Gymnolepas Aurivillius, Kongliga Svenska Vetenskaps-Akademiens Hand- 



lingar, XXVI, No. 7, p. 33, type, G. pellucida. Not Gymnolepas Blainville, 



1824. 

 1897. Eremolepas Weltxer, Archiv fiir Naturgeschichte, Jahrg., 1897, I, p. 239, 



substitute for Gymnolepas Aurivillius. 



Nude pedunculate barnacles with the integument of the capitulum 

 very thin, without an internal muscular layer, and typically having a 

 pair of very small, irregularl}^ lobed, imperfectly calcilied scuta; cirri 

 nearly straight, very short, and weak, the rami with 6 to 12 segments, 

 each segment armed with a continuous or interrupted circle of spines. 

 Caudal appendages wanting or of one short joint. Penis hairy. 

 Pelagic, attached to medusa. 



Type. — A. univalvis Quoy and Gaimard. 



The type of this genus, Alepas univalvis., is known solel}'^ b}^ the 

 insufficient description of Quoy and Gaimard, ^ published more than 



«1827. Anatif a univalvis Quoy and Gaimard, Annales des Sciences Naturelles, X, 



Zoologie, p. 234, pi. vii, figs. 8, 8a. Strait of Gibraltar. 

 1829. Alepas parasita Rang, Manuel de I'Hist. Nat. des Moll., p. 364, pi. viii, fig. 



5, based on the same specimens. 

 1834. Anatif a parasita Quoy and Gaimard, Voyage de 1' Astrolabe, Zoologie, III, 



p. 641, pi. xciii, figs. 1-3. 

 . {1) Triton {Alepas) fasciculatus Lesson, Voyage autour du Monde de La 



Coquille, Zoologie, II, Pt. 1, p. 442, pi. xvi, fig. 6. 

 1851. Alepas parasita Rang, Darwin, Monograph on the subclass Cirripedia, 



Lepadidee, p. 163. 

 Lesson's figure is very poor, and does not agree with the description. If the cirri 

 are correctly figured, a species different from A. univalvis is indicated. 



