File:Bulletin - United States National Museum (1916) (20505911265).jpg

Title: Bulletin - United States National Museum
Identifier: bulletinunitedst931916unit (find matches)
Year: 1877 (1870s)
Authors: United States National Museum; Smithsonian Institution; United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc. ); for sale by the Supt. of Docs. , U. S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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THE SESS1LR BARNACLES. 121 rather wide and doep iiotcli. Oci'liideiit margin inflexcd, a rather deep crease under it for the adductor muscle. No pits or scars for depressor muscles are visible. Length 4.5 mm. (pi. 75, iig. Ic; also fig. 94). The tergum is extremely thiclc, narrow, with a rather shallow articular furrow. There is a sort of short spur united Avith the basi- scutal angle and projecting below it. The carinal lobe of the valve appears pushed upward. Crests for the depressor muscle are rather strong and irregular. The numerous specimens of this species have been in the collection many years, and the body was entirely destroyed in those opened. The uniform violet black color of the interior is unusual and char- acteristic. Chthaniahis iniertcxtus Darwin, a Philippine species, is purple Avithin, but other known species are lighter colored or clouded with some dark shade on a lighter ground. CIITHAMALUS CIRRATUS Darwin. 18r>4. CfithaiiKilus cin-alus Dakwin, Rlonojiraph, p. -IGl, pi. 18, figs, -ia, 4b. 1909. Chthamalus cirratus Darwin, Pilsbry, I'roc. U. S. Nut. Mus., vol. 37, p. 71, fig. 2. Distribution.—Pescadores Islands, Peru, to the northern Chonos Islands. The barnacle is either depressed-conic, 10 to 13 mm. in diameter, corroded above, ribbed and crenate at the base, when not croAvded,
Text Appearing After Image:
Fig. 95.—Chthamalus ciueatus. San Loiiknzo I.sland, Peru, inside views of teugum and scutum enlarged, and guoul' ou tukee entire animals, natural size. or when croAvded the Avails become vertical, and the orifice and the opercular valves are large. There is also a smooth form. Accord- ing to DarAvin, large specimens from Coquimbo and Valparaiso have a height of 1 inch with a basal diameter of half as much. All of those I have seen from Peru are depressed. The interior is usually dull purplish (fig. 95). The opercular valves are corroded. The scutum has a 7o7if/, straiKjlij projcctiiKj articular rib., Avhich has a long, nearly straight or some- times convex slope to the deep articular furroAv, unlike any form pf C. stellatns. The adductor muscle pit is deep. The lateral de-

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