THE SESSILE BABNACLES. 



1 ^f^ 



collections made by Dall and otluns, on shore and in moderate depths, 

 and lliose of the Albatross in deeper water, show that it does not 

 extend to the Alaskan Penuisula, or even, so far as we know, to Sitka. 



Locality. 



Fort Tongass, Alaska 



Peut Strait 



Vancouver Island ' 



Juan de Fuca Strait 



Neah Bay, Wash 



Port Townsend Bay, Wash 



Point H udson , Port Townsend 



Bellinpham Bay, WTiatcom Coimty, Wash.. 



PuKPt Sotmd 



Station 3593, latitude 48° 11' 30" north; 

 longitude 122° 48' west (37 fathoms). 



Port Orford, Oreg 



Farraloue Islands, Cal 



Station 4496, Monterey Bay, Cal. (10 fathoms) 

 Santa Cruz, Cal 



Collector. 



Notes. 



F. M. King 



Com. L. A. Beardslee, U.S.N. 



U. S. exploring expedition. . . 



J. G. Swan 



do 



do 



Dr. Suckley, 1S5G 



J. (i . Swan 



Albatross 



Bottom temperature 4(1' 



F. W. Crosby 



C. n. Townsend ' Heiglit, 47 mm., diameter, .50 



mm. 



Albatross. 



Diameter, 50 mm. 



1 Specimens in British Museum and Academy of Natural Sciences of Philadelphia. 

 BALANUS FLOS Pilsbry. 

 Plate 32, figs. 1-1 /. 



1907. Balanus fios, Tilsbrv, Bull. Bureau of Fisheries, vol. 26, \>. 201, pi. 9, 

 tigs. 1-7 ; p. 202, fig. 3. 



Type.— Cat No. 32405, U.S.N.M., from Albatross Station 4558, 

 near Point Pinos Lighthouse, Monterey. 



Distribution. — Coast of California, surface to 338 fathoms. 



The general form is tubular, the base about as wide as long; walls 

 steep, sometimes flaring above; parietes faintly pink, sheath pink, 

 opercular valves white. Surface smoothish, without an epidermis. 

 Orifice large, very deeply toothed. 



The scutum is concave between apex and base; length over twice 

 the width; external sculpture of shallow, spaced grooves parted by 

 flat growth-ridges, of which alternate ones crenulate the occlndcnt 

 margin. Inside there is a very low articular ridge half the length 

 of the tergal margin, and hardly any articular furrow. The adduc- 

 tor ridge is low and inconspicuous^ near and parallel to the tergal 

 margin; very weak in the lower half, where it bounds the narrow 

 pit for the depressor muscle. 



The tergum has an acute apex, triangular in section, but is not 

 "beaked." Scutal border concave, thin, and acute throughout. 

 Articular ridge is rather strong, overhanging toward the carinal 

 border, crescentic, extending from apex to basiscutal angle. Articu- 

 lar furrow extremely broad and shallow. Crests for the depressor 

 muscles feebly developed. Externally it is flat, marked Avith growth- 

 lines, and faintly traced longitudinal striie near the carinal margin. 

 No furrow to the spur, which is wide at the base, tapering to the 

 narrow distal end, and remote from the basiscutal angle. 



