DESCRIPTION OF PLATES, 5 — 7. 643 



Fig. 1 d, Balanus perforatus — var. fistulosus. 

 2 a, ,, amphitrite, — var. venustus. 

 2 b, „ ,, var. cirratus. 



2 c, ,, „ ,, pallidus. 



2 c?, ,, „ „ Stutchburi. 



2 e, ,, ,, ,, communis. 



2/, „ „ „ niveus. 



2g, „ ,, ,, obscurus. 



2 h, ,, ,, scutum, var. communis. 



2 i, ,, „ „ ,, Stutchburi. 



2 £, ,, ,, tergum ,, pallidus. 



2 l t ,, ,, ,, „ communis. 



2 «?, 2 w, and 2 o, ,, ,, var. Stutchburi. 



3 a, Balanus pcecilus, scutum, internal view; 3 b, tergum, external. 



4 a, Balanus eburneus, scutum, external view ; 4 b, tergum, 



external ; 4 c, scutum, internal ; 4 d, tergum (var.), internal. 



PLATE 6. 



Genus — Balanus. 



Fig. 1 a, Balanus improvisus ; 1 b, scutum, internal ; ] c, tergum, ex- 

 ternal view. 



2 a, Balanus nubilus, scutum, internal view ; 2 b, tergum, ditto ; 



2 c, tergum, external view. 



3 a, 3 b, Balanus corrugatus, scutum and tergum, internal view. 



4 a, Balanus porcatus ; 4 b and 4 c, scutum and tergum, internal 



views ; 4 d, tergum external ; 4 e, basal edge of the parietes 

 of wall of shell. 



5 «, Balanus patellaris; 5 b, scutum, internal; 5 c, tergum, external. 



6 a, Balanus crenatus. 



6 b, 



6 c, 



6 d and 6 e, 



6 /and 6g, 



smooth var. 

 elongated var. 



scutum and tergum, external views. 

 ,, ,, internal views. 



PLATE 7. 

 Genus — Balanus. 



Fig. 1 a, Balanus glandula, scutum, internal ; 1 b, tergum, external. 



2 a, Balanus balanoides ; 2 b, portion of basal edge of parietes of 



a compartment ; 2 c, tergum ; 2 d, tergum, var. 



3 a, Balanus cariosus ; 3 b, portion of basal edge of parietes of a 



compartment; 3c, scutum, internal view of; 3d, tergum, 

 internal ; 3 e, tergum, external view. 



4 a, Balanus declivis, lateral view, with basal membrane removed ; 



4 b, rostrum (to left hand), two lateral compartments, and 

 carina ; 4 c and 4 d, scutum and tergum, external views. 



5 a, Balanus Hameri ; 5 b, scutum, internal view ; 5 c, tergum, 



external view. 



