136 MARINE FAUNA OF ST. ANDREWS. 



Suborder THOKACICA. 

 Fam. Lepadida. 



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 Tkuiaria thuja and Sertularia cupressina from deep 

 water. 



Fam. Balanidae. 



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

 Not uncommon on Hi/as 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 sm-faces 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 exuvise 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. 



