204 BULLETIN OF THE BUREAU OF FISHERIES. 



The penis is extremely long, 30 mm., tapering, flesh colored, and extremely finely and closely 

 annulate. 



The mandible (tig. 4, c) has four principal teeth, decreasing in size from the upper to the lower one. 

 The inferior extremity is rounded, and like the lower margin is densely hairy. The maxilla (fig. -1, a) is 

 remarkable' for its square, even edge, densely beset with large and small spines. 



The first cirrus stands well apart from the others. It has a greatly enlarged basal joint and short , equal 

 rami composed of about 16 joints. The second cirrus (fig. 4, b) is longer, but still is shorter than the 

 following cirri. The joints protrude and are densely bristly on the forward side. The diameters of the 

 rami decrease regularly and slowly from the second to the last pair, but the length is about the same in 

 pairs iii to vi. The third pair of cirri has rami of about 32 joints, and 22 mm. long. The last pair of 

 rami has about four pairs of spines on each joint. 



Type, no. 11840 U. S. National Museum, from Albatross station 4239, junction of Clarence Strait 

 and Behm Canal, Alaska, in 206 to 248 fathoms, coarse sand and rocky bottom, July 9, 1903. Cotypes, 

 no. 32404 TJ. S. National Museum, from same station. Taken also at station 4253, Stephens Passage, 

 Alaska, in 131 to 1SS fathoms, July 14, 1903. 



This is one of the finest species of Balanus yet described, remarkable for its great size, the uncontented 

 sutures, and the gaping orifice of the outer shell. The weakness of the ridges and crests of the inner 

 faces of the valves is also notable. Until nearly adult the plates of the wall may be readily separated 

 without breaking them; and even the full-grown barnacle has only a membranous attachment between 

 the valves and the base. 



The species is closely related to B. hameri (Ascanius) of the North Atlantic, as defined by Darwin, 

 but differs in numerous details. The spur of the terguni is much narrower, only about half as wide as 

 the space between it and the basi-scutal angle. The scutal and carinal margins of the tergum are more 

 nearly straight. The articular ridge is weaker in both scutum and tergum. The maxilla? have no ''deep 

 notch under the two upper great spines," having an even edge. The inferior angle of the mandible is 

 not spinose. The segments of the second pair of cirri scarcely protrude in front in either B. evermanni 

 or B. hameri. The opercular valves show traces of radial (longitudinal) striae only near the apices. They 

 exceed in size the large fossil valves of B. hameri figured by Darwin in the Monograph on the Fossil 

 Balanidse (pi. 1, fig. 7c, 7d). 



B. evermanni grows in clusters, one mounted upon another. The structural weakness consequent, 

 upon the lack of sutural cement is evidently a modification correlated with a deep water habitat. No 

 littoral barnacle of such feeble structure could exist. 



Balanus (Conopea) galeatus Linnaeus. 



[PI. vn, fig. 5-6, and pi. ix, fig. 8-11.] 



Several dead specimens were brought, up at Albatross station 4432. Brockway Point, Santa Rosa 

 Island, in 272 fathoms gray mud, attached as usual to gorgonians. The cups were empty or filled with 

 sand, but from the debris I obtained two scuta and a tergum. As no species of this section of Balarvus has 

 been reported from the west coast of America hitherto, and B. galeatus has been known heretofore as an 

 exclusively warm-water form of the Antillean region, some details regarding the Pacific specimens may 

 . be useful. 



The cups are rather short, only one (fig. 5) showing the tendency to lengthen the carina into a point, 

 as is so characteristic of B. galeatus. The base is somewhat porous, but less so than the Atlantic speci- 

 mens of galealus compared. The parietes are solid, and normally grooved inside. The scutum (pi. ix, 

 fig. 10, 11) is triangular, less widely truncate apieally than in typical galeatus as figured by Darwin. The 

 articular ridge is very thick and prominent. The tergum I pi. ix, fig. 8, 9) resembles that of B. galeatus 

 as figured by Darwin, its apex having a squarely truncated appearance, due to the projection of the 

 articular ridge. 



