324 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



and cylindrical, with the walls very thin and the sutures often obliterated; 

 as the opercular membrane is very narrow, the opercular valves are much 

 influenced both in their outline and in their crests and articulations by the 

 varying form of the shell. I have even seen specimens with the scutum and 

 tergum on one side twice as large as on the other side. 



HAWAIIAN SPECIES. 

 CHTHAMALUS INTERTEXTUS Darwin. 



1854. Chthamalus intcrteftus DARWIN, Monograph, p. 467, pi. 19, tigs, la, 1& 



(Philippine Archipelago, Cuming). 

 1913. fChthamalus intertcxtus Darwin, HOEK, <S'?&of/rc-Expeditie, Cirripedia, 



p. 269 (Bay of Kankamaraan, south coast of Kangeang). 



Diamond Head, Oahu, near the lighthouse, on a reef of volcanic 

 rock covered at high water ; abundant. II. A. Pilsbry, 1913. These 

 specimens have the scuta and terga calcified together, the basal edges 

 of the compartments inflected, and the interior of a beautiful violet 

 color (petunia violet or anthracene violet of Kidgway). The sutures 

 are interfolded when unworn. Though far from the original lo- 

 cality, they seem to be quite typical. 



CHTHAMALUS HEMBEJ.I (Conrad). 



Plate 76. 



1S37. Eurai>lii<i linnbcU CONRAD, Journal of the Academy of Natural Sci- 

 ences, vol. 7, p. 261, pi. 20, fig. 13. 



1854. CJitliamalus liembeli Conrad, DARWIN, Monograph, p. 465, pi. 18, figs. 

 5-5e. 



1S97. ClitlifriiHiliis hrinbcli (Conrad) WELTNER, Verzeichnis, p. 272. 



1905. Chtliu-mtil-ns licmltclll Conrad, GRUVEL, Monographic des Cirrhipedes, 

 p. 205. 



Distribution. Hawaiian Islands. 



The barnacle is large, conic, with a large quadrangular orifice ; very 

 solid and strong; parietes pale grayish vinaceous, the ala3 and sheath 

 seal brown (or grayish if worn) ; exterior somewhat folded or but 

 very slightly so. Sutures, when not obliterated by corrosion, formed 

 of interlocking teeth. Radii narrow. Alse very wide. The sheath 

 is long. The lateral angles of the orifice are somewhat hollowed out 

 for the basitergal corners of the scuta. The interior below the 

 sheath is smooth, pale buff. " Basis membranous, but surrounded 

 by a ledge formed by the inflected basal edges of the parietes," or in 

 old individuals the inflected edges of the compartments cover the 

 whole base with a strong, whitish calcareous layer. The false basis 

 does not, of course, show radial furrows or lines, but is quite smooth. 



The scuta and terga are firmly cemented, but not calcified, together, 

 and may be separated by boiling in potash. The articulating faces 

 are very thick. Scutum with a deeply bisinuate tergal margin, the 



