78 
BULLETIN OE THE BUREAU OE FISHERIES. 
by nearly its own width. A smooth depressed band runs to it. The area on the scutal side of this 
band is marked with widely spaced, strongly arched, linear riblets. The wide area on the other side 
has very oblique linear riblets, and an interstitial sculpture of very weak, fine, longitudinal striae. 
There are some minute hairs on the cuticular riblets, along the scutal border, but none on the outer 
surface of the plate. Internally the upper or beak portion of the plate is transversely striated. The 
articular ridge is high and massive, arcuate; the articular furrow wide but not very deep. The crests 
for the depressor muscle are short and sharp. 
This species is related to B. corollijormis Hoek and B. hirsutus Hoek, the former from southeast of 
Kerguelen Island, 150 fathoms, the latter from the Faroe Channel, in 516 fathoms. Both have a more 
or less hairy cuticle, while B. hoekianus has no noticeable cuticle on the walls. B. corollijormis has some 
resemblance in shape of the walls to hoekianus, but the sheath is shorter, only one-third the length 
of the plates, and the tergum is of quite different shape. In B. hirsutus the articular ridge of the tergum 
projects conspicuously beyond the scutal margin, in external view, being much larger than in B. hoeki- 
anus, and the spur is scarcely removed from the baso-scutal angle of the plate, whereas in B. hoekianus 
the baso-scutal angle is conspicuously produced, and the spur is separated from it by at least the basal 
width of the spur. The mandible of B. hoekianus has a smaller tuft of hairs on the upper margin, and 
the lower teeth are conspicuously obtuse, not acute as in B. hirsutus. This bluntness of the teeth is not 
the result of wear, since the unexposed teeth of the next moult, visible through the mandible, are equally 
obtuse. The maxillae are also somewhat different in the two species. The number of spines on the 
segments of the posterior three pairs of cirri is smaller than usual. 
B. hoekianus, named in honor of Dr. P. P. C. Hoek, is therefore quite distinct from its two antipodal 
relatives. 
Balanus cailistoderma, new species. [PI. xii, fig. 5, pi. xv, fig. 3-7.] 
Type no. 38690 U. S. National Museum. 
Type locality: Albatross station 5068, Suruga Gulf, Japan, in 77 fathoms. 
A species of Hoek’s Section G. Base in large part membranous; parietes solid; no radii. The 
shell is in form a broadly truncated cone, the orifice rather large, ovate, with deeply toothed border. 
Parietes lemon yellow, fading to whitish near the orifice; alse whitish. Under a lens the exterior is 
