136 
MARINE FAUNA OF ST. ANDREWS. 
Suborder THORACICA. 
Fam. Lepadidae. 
Genus Lepas, L. 
Lepas anatifera , L. ; Darwin, Mon. i. p. 73, pi. 1. f. 1. 
On the bottoms of ships, and thrown ashore after storms 
attached to timber. 
Genus Scalpellum, Leach. 
Scalpellum vulgare , Leach; Darw. Mon. i. p. 222,pi. 5.f. 15. 
On Thuiaria thuja and Sertularia cupressina from deep 
water. 
Fam. Balanids. 
Subfamily B alanine. 
Genus Balanus, Lister. 
Balanus porcatus , E. da Costa ; Darw. Mon. ii. p. 256, 
pi. 6. f. 4. 
Abundant on stones, Ascidia sordida , crabs, &c. in deep 
water, and occasionally between tide-marks. 
Balanus crenatus, Bruguiere; Darw. Mon. ii. p. 261, pi. 6. f. 6. 
Not uncommon on Hyas araneus , Lithodes maia , and on 
rocks in the laminarian region. 
Balanus halanoides , L.; Darw. Mon. ii. p. 267, pi. 7. f. 2. 
Very abundant; coating extensive surfaces of the rocks 
between tide-marks and in the laminarian region, and ad¬ 
hering to mussels, sticks, posts, &c. Elongated varieties are 
not uncommon. The exuviae swarm in the rock-pools and on 
the surface of the sea in summer. 
Balanus Hameri , Ascanius ; Darw. Mon. ii. p. 277, pi. 7. f. 5. 
Occasionally in deep water ; a small thorn-tree (still fresh) 
was covered with fine examples. 
