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. Balanidas. 



Subfamily Balanin^. 



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, Braguifere; Darw. Mon. ii. p. 261, pi. 6. f. 6. 

 Not uncommon on Hyas araneus, Lithodes maia, and on 

 rocks in the laminarian region. 



Balanus balanoides, 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, jjosts, &c. Elongated varieties are 

 not uncommon. The exuviae swarm in the rock-pools and on 

 the sm-face 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. 



