THE SESSILE BARNACLES. 47 



three pairs of spines on each. The caudal appendages are 2 mm. 

 long, much shorter than the protopod of cirrus vi, composed of 10 

 segments, and copiously hairy. The cirri and caudal appendages 

 are much like those of V. euglypta, but the latter are shorter in com- 

 parison to the size of the barnacle. 



A single entire specimen of this large Verruca was obtained, but 

 several valves were taken at a station at the other end of the archi- 

 pelago. It is chiefly notable for the flat top, absence of salient 

 unibones, and the generally inornate appearance, somewhat like 

 V. coraliopJiila, which belongs to the same group. It is one of the 

 largest Verrucas yet described, and the only one known from the 

 northern Pacific. It is a truly deep-sea species, which may prove 

 to have a wide distribution. V. capsula Hoek, 1913, from the Malay 

 Archipelago in 513-1,300 meters seems, from the figures and descrip- 

 tion, to differ very little from V. Tialofheca. I doubt whether it is 

 specifically distinct. Both of these species are closely related to 

 V. magna Gruvel, from the Gulf of Gascoyne. 



VERRUCA INTEXTA Pilsbry. 

 1912. Verruca intexta PILSBRY, Proc. U. S. Nat. Mus., vol. 42, p. 292. 



Type.C&t. No. 43468, U.S.N.M. 



Type locality. Albatross station 5259, off northwestern Panay, 

 312 fathoms. 



This species belongs to the group of V. nexa. 



VERRUCA ALBATROSSIANA Pilsbry. 

 1912. Verruca albatrossiana PILSBRY, Proc. U. S. Nat. Mus., vol. 42, p. 292. 



Type. Cat. No. 43472, U.S.N.M. 



Type locality. Albatross station 5447, east of Luzon, 310 fathoms. 

 This species and the preceding will be illustrated in a report on 

 the Cirripedia of the Albatross Philippine cruise. 



Suborder BALANOMORPHA. 

 1905. Operculata, tribe Symetrica GRUVEL, Monographie des CirrhipMea, p. 189. 



KEY TO FAMILIES AND SUBFAMILIES. 1 



a 1 . Rostrum having radii; labrum with an angular notch or cleft in the middle. 



Family BALANIDJJ, p. 48. 



6 1 . Opercular valves together as large as the orifice, the scutum and tergum articu- 

 lated together Subfamily BALANIN^E, p. 49. 



b 2 . Opercular valves together not nearly as large as the orifice; basis membranous. 



c 1 . Compartments six, but the rostrum is divided into three by fine sutures, visible 



within; wall porose, or if filled up, having radial lamellae at the base; the 



sheath forms the wall of the body chamber, reaching to the base, where it is 



deeply, irregularly notched; articular ridge of the scutum chitinous. 



Subfamily CHELONIBHN^E, p. 262. 



c 2 . Compartments six, the rostrum undivided ; scutum and tergum not articulated 

 together, sometimes absent Subfamily CORONULIN.E, p. 268. 



1 For convenience in identification, the arrangement of the key is artificial. 



