THE SESSILE BAENACLES. 21 



or. Mo\able platea not steeply sloping, the top more or less flattened ; suture or area 

 between parietea of fixed scutum and tergum linear or narrow. 

 &'. Base of walls inflexod to form a broad ledge; a depending myopliore in the 

 fixed scutum; sculpture weak; apex of rostrum marginal. 



V. coraliophila, p. 21. 

 6^. Base of walls simjile or rarely inflexed; sculpture strong. 

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



V. nexa, p. 29. 



C-. Apex of rostrum marginal or nearly so; base of the walls not inflexed, but 



sometimes thickened. 



rf'. Rostrum and carina having short ribs 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-. Ptostrum having short ribs curving to base of movable scutum, and above 

 the upper articulating rib; carina without such ribs. 

 eK Movable plates each with 4 articular ribs. 

 /'. Interlocking teeth and ribs ol carina and rostrum subcqual. 



V. calotheca Jlavidala, p. 34. 

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

 c\ Movable plates each with 3 articular ribs. 

 /'. Yellowish; walls sub vertical, rather thin-edged; adductor pit shallow, 



without ridge or myophore V. c. hetcropoma, p. 35. 



p. Yellow; walls subvertical, blimt-edged; fixed scutum having a pit and 

 adductor ridge, fixed tergum not calloused within. 



V. xanthia, p. 30. 

 p. WTiite; walls spreading, thin and sharp-edged; fixed scutum having a 

 high adductor ridge or myophore; fixed tergum calloused within. 



V. floridana, p. 31. 



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



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



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



Section A: METAVERRFCA. 



The basal borders of the wall plates are inflexed, fomiing 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. coraliopJiila. 



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.^ 



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 



' For footnote see p. 22. 

 4720°— Bull. 93—16 3 



