46 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



INDO-PAOIFIO SPECIES. 



VERRUCA HALOTHECA Pilsbry. 

 Plate 8, figs. 1, la. 



1907. Verruca halotheca PILSBRY, Bulletin of the Bureau of Fisheries, vol. 26, p. 



188, pi. 4, figs. 9, 10 (June 29). 

 1913. ? Verruca capsula HOEK, Siboga-Expedhie, Cirripedia, p. 130, pi. 12, figs. 



1-3; pi. 13, figs. 1-4. 



Type.C&t. No. 32423, U.S.N.M. 



Type-locality. -Albatross station 4060, off northeast coast of Hawaii, 

 on a volcanic pebble, in 913 fathoms, bottom temperature 36. 5 F. 

 Also taken off Kauai in 228-235 fathoms, a few detached valves. 



The barnacle is white, flattened above, with steep sides, almost 

 perpendicular to the base of attachment, which has a rounded con- 

 tour. Surface weakly corrugated with concentric growth ridges. 



Movable scutum small, flat, with an acute apex and three articular 

 ridges, the upper one minute, lower one barely indicated, not raised, 

 the middle one very wide. Movable tergum larger, quadrate, flat, 

 with three strong imbricating articular ridges. 



Fixed scutum roughly quadrate, divided by an oblique sulcus into 

 two nearly equal triangles. Fixed tergum of very irregular shape, 

 divided into three triangular areas; its umbo adjacent to that of the 

 movable tergum, but not quite marginal. 



The carina articulates with the rostrum by means of three large 

 and several smaller teeth, forming a zigzag suture; each tooth ter- 

 minates a low ridge. It articulates with the fixed tergum by a single 

 tooth projecting into the tergum near the base. 



The rostrum is irregularly cone-shaped, minus a segment, in shape 

 somewhat like the anterior valve of some chitons. It has several 

 radiating ridges on the carinal side. 



The basal margins of the wall are inflexed, forming a ledge 1.5 mm. 

 wide. The fixed scutum has a flat, tongue-shaped adductor ridge, 

 depending vertically. The other valves are plain inside. The carina 

 and rostrum articulate by an undulating suture. The lower surface 

 of the movable scutum has two rounded projections into the mov- 

 able tergum. There is a thin, yellowish, basal membrane. 



Greatest rostrocarinal length at base 14 mm., at umbones 12 mm., 

 breadth 12.5 mm. Height from base to apex of rostrum, fixed scu- 

 tum or carina 7.5 mm. 



Length of the straight rostrocarinal hinge of the opercular valves 

 10 mm. Length of scutum from this line to umbo 5.5 mm. Length 

 of tergum 6 mm. 



The first cirrus has equal rami 3 mm. long, of 14 and 12 segments. 

 Cirrus ii has the anterior ramus, of 9 segments, somewhat over half 

 as long as the posterior, of 22 segments. Cirrus iii with rami of 29 

 and 34 segments. Cirrus vi has rami of about 40 segments, with 



