188 BULLETIN OF THE BUREAU OF FISHERIES. 



VERRUCID£. 



Verruca halotheca, n. sp. 

 [PL iv. fig. 9, 10.] 



Shell white, flattened above, with steep sides, almost perpendicular to the base of attachment, 

 which has a rounded contour. Surface moderately corrugated with concentric growth ridges. Mov- 

 able scutum small, flat, with an acute apex ami three articular ridges, tin- middle one strongest. Mov- 

 able trrgum larger, quadrate, flat, with threestrong imbricating articular ridges. Fixed scutum roughly 

 q.uadrate 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 teeth terminates a 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. Greatest rostro-carinal length at base 14 mm., at umbones 12 mm., breadth 12.5 mm. 

 Height from base to apex of rostrum, fixed scutum or carina, 8 mm. 



Length of the straight rostro-carinal hinge of the opercular valves 10 mm. Length of scutum from 

 this line to umbo 5.5 mm. Length of tergum G mm. 



Type, no. 32423 U. S. National Museum, from station 40G0, northeast coast of Hawaii Island, in 

 913 fathoms, on a pebble of volcanic rock. 



A single specimen of this large Verruca was obtained. It is clearly distinct from any of those 

 described by Darwin, Hoek, or in Gruvel's recent monograph, though related to V. trisulcata, spengleri, 

 etc. It is chiefly notable for the flat top, absence of salient umbones, and the generally inornate appear- 

 ance. It is the largest Verruca yet described. A few detached valves of a small individual were taken 

 at station 3998, vicinity of Kauai Island, in 228 to 235 fathoms, with ( 'ulophraym us and Pacilasma. 



CHTHAMALID.-E. 



Genus CATOPHRAGMUS Sowerby. 



This genus has hitherto been known by two species: (', imbricatus Sowerby, from Antigua and 

 C. polymerus Darwin from New South Wales, both of which are described in Darwin's monograph on 

 the Balanidse. The lirst, C. imbricatus, is a very rare barnacle. Both of the species are littoral, associated 

 with or growing on Tetraclita and other shore forms. 



A third species of the genus, from still another part of the world, is represented by certain mutilated 

 individuals dredged by the Albatross near Kauai in about 230 fathoms. It is very distinct from the 

 others by its well developed caudal appendage — thai organ being absent in ( '. polymerus, very small in 

 C. imbricatus. Moreover, the valves show many points of difference, and the mandibles, maxillae, and 

 cirri are unlike in various details. 



Catophragmus darwini n. sp. 



[PL v.] 



( ieneral form of the animal uncertain, since it is known only by broken capitula, which are Balanus- 

 like, made up of valves of dense and porcelain-like texture; white. There are at least three whorls 

 of plates, the first whorl consisting of scuta and terga, the second of carina, latera, and rostrum, the third 

 of imbricating basal plates. 



The scutum (pi. v. fig. 7 outside, fig. 4 inside), is triangular, sculptured with rather widely spaced 

 riblets parallel to the basal margin. The occludent and basal margins are straight . The tergal margin is 

 somewhat convex, and on the apical half bears a pro j ecting wing or articular ridge with serrate edge 

 and closely grooved and costate surface. This wing projects into the articular groove of the tergum. 

 Inside the scutum shows a beveled, obliquely costate and thick occludent border, a slightly reflexed 



apical area, and a series of line sharp grooves running inward from the teeth at the ire Igeof the articular 



ridge or wing. The scar of the adductor muscle is not noticeable. The length of the scutum is 5.3 mm. 



