136 MARINE FAUNA OF ST. ANDREWS. 



Suborder THORACICA. 

 Fam. Lepadidae. 



Genus Lepas, L. 

 Lepas anatifera, L. ; Darwin, Mon. i. p. 73, pi. l.f. 1. 



On the bottoms of ships, and thrown ashore after storms 

 attached to timber. 



Genus Scalpellum, Leach. 



ScalpeUum vulgare ) Leach ; Darw. Mon. i. p. 222, pi. 5. f. L5. 



On Thuiaria thuja and Sertularia cupressina from deep 

 water. 



Fam. Balanida?. 



Subfamily Balajtixs:. 



Genus Balanus, Lister. 



Balanus porcatas, E. da Costa ; Darw. Mon. ii. p. 256, 

 pi. 6. f. 4. 



Ahundant on stones, Asci<ti<t 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 Ilyas araneus, Lith<><!is main, and on 

 rucks in the laminarian region. 



i;<dtimis balanoides, L. ; Darw. Mon. ii. p. 267, pi. 7. f. 2. 



Very abundant ; coating extensive surfaces of the rocks 

 between tide-marks ami in the laminarian region, and ad- 

 hering to mussels, sticks, posts, &c. Elongated varieties are 

 nut uncommon. The exu vise swarm in the rock-pools and on 

 the surface of the sea in summer. 



Balanus Hameri, Aseanius ; Darw. Mon. ii. p. 277, pi. 7. f. 5. 



Occasionally in deep water; a small thorn-tree (still fresh) 

 was covered with tine examples. 



