THE SESSILE BARNACLES. 21 



a 2 . Movable platea not steeply sloping, the top more or less flattened ; suture or area 



between parietes of fixed scutum and tergurn linear or narrow. 

 ft 1 . Base of walls inflexed to form a broad ledge; a depending inyophore in the 

 fixed scutum; sculpture weak; apex of rostrum marginal. 



V. coraliophila, p. 21. 



b' 2 . Base of walls simple or rarely inflexed; sculpture strong. 

 c 1 . Apex of rostrum not marginal; base of the walls inflexed in the adult stage. 



V. nexa, p. 29. 

 c 2 . Apex of rostrum marginal or nearly so; base of the walls not iuflexed, but 



sometimes thickened. 



rf 1 . Rostrum and carina having short riba above their upper articulating ribs, 

 and curving to the bases of the movable plates; scutum convex having 3, 



tergum 4 articular ribs V. alba and subspecies, pp. 25, 28. 



d 2 . Rostrum having short ribs curving to base of movable scutum, and above 



the upper articulating rib; carina without such ribs. 

 c 1 . Movable plates each with 4 articular ribs. 

 f l . Interlocking teeth and ribs of carina and rostrum subcqual. 



V. calothcca Jlavidida, p. 34. 



/-. Upper teeth and ribs of carina and rostrum larger.. V. calotheca, p. 33. 

 e 2 . Movable plates each with 3 articular riba. 

 f 1 . Yellowish; walls subvertical, rather thin-edged; adductor pit shallow, 



without ridge or inyophore V. c. heteropoma, p. 35. 



f 2 . Yellow; walls subvertical, blunt-edged; fixed scutum having a pit and 

 adductor ridge, fixed tergum not calloused within. 



V. xanthia, p. 36. 



f 3 . White; walla spreading, thin and sharp-edged; fixed scutum having a 

 high adductor ridge or myophore; fixed tergum calloused within. 



V. floridana, p. 31. 



d 3 . No short ribs above the upper articulating ribs of rostrum and carina, which 

 have marginal apices; basal edge of walls obtuse; movable plates having 

 each 4 articular ribs V. entobapla, p. 38. 



Section A: METAVERRtTCA. 



The basal borders of the wall plates are inflexed, forming a wide 

 basal ledge; the fixed scutum bears a depending tongue-shaped 

 adductor ridge or myophore; the apex of the rostrum is marginal; 

 top flattened ; sculpture weak. 



Type. V. coraliophila, 



VERRUCA CORALIOPHILA, new species. 

 Plate 1, figs. 1-5. 



Type. Cat. No. 43469, U.S.N.M. 



Type-locality Albatross station 2662-3, 2669, 2671-2, between 

 the Bahamas and Cape Fear. 1 



The barnacle is cream-white, seated upon a branch of white coral. 

 The carinorostral wall slopes somewhat, the scuto tergal wall usually 

 being vertical. The movable scutum and tergum lie parallel to or at 

 a small angle with the plane of the base, each having three articular 

 ribs. The plates of the wall are only weakly sculptured, usually almost 



1 For footnote see p. 22. 

 4729 Bull. 9316 3 



