THE SESSILE BARNACLES. 39 



in the fixed scutum; by the rounded callous rim near the beveled 

 basal edge within, and which is best seen in detached valves; and by 

 the upper border of the rostrum. Its upper articular rib stands 

 close to the scutum, from which it is separated by a naiTow depres- 

 sion in which a minute thread runs parallel to the margin or curves 

 a little at the end. In V. calotheca there is a far wider area bearing 

 cui'ved riblets. The color of the interior also is different in the three 

 specimens by which V. entohapta is known. 



V. imhricata Gruvel, from near the Canary Islands, seems to be 

 closely related to V. entol)apta, but it differs by being more depressed 

 and of a pure white color; the fixed tergum projects nmch farther 

 above the fixed scutum, and both of the movable plates have one 

 more articular rib. The interior of V. imhricata has not been 

 described. 



This species occurs witli V. xantliia, from which it differs con- 

 spicuously in sculpture. 



Section C: CAMERA VERRUCA. 



The basal borders of the wall-plates are thin and simple; tlie apical 

 cavities of fixed tergum and rostrum are partitioned ofi^, forming recesses 

 of the general cavity. The fixed scutum has a vertical, partition-Uke 

 myophore. The parietes of fixed scutum and tergum are separated 

 by a broad ala and a radius. The movable plates slope steeply. 

 Cirri with nearly equal rami; terminal appendages extremely short. 



Type.— Verruca englypta. 



VERRUCA EUGLYPTA Pilsbry. 

 Plate 3, figs. 2, 2a. 

 1908. Verruca euglypta Pilsbry, U. S. Nat. Mub. Bull., 60, p. 108, pi. 10, figa. 1 , 2, 3. 



Type.— Csit. No. 32906, U.S.N.M. 



Type-locality. — Albatross station 2415, off Femandina, Florida, 

 north latitude 30° 44'; west longitude 79° 26', in 440 fathoms, bot- 

 tom temperature 45°.6 F.; on the coral Anisopsammia profunda 

 Pourtales. 



The plates of this barnacle are thin. The basal edge of the wall is 

 thin and simple. The movable scutum is smooth inside, with a shal- 

 low, oblong pit for the adductor nmscle, and a narrow, well-raised 

 rim along the occludent side and apex. 



The rostrum and carina unite in a sutui"e conspicuously zigzag 

 inside as well as out. The cavity of the apex of rostrum is inclosed 

 by a partition (pi. 3, fig. 2). The carina has a very much narrower 

 partition. 



The fixed scutum has a vertically depending plate, which from its 

 position jnust be regarded as an enlarged adductor ridge or myo- 

 phore; behind it is a deep, narrow cavity. The cavity of the fixed 



