Crustacea of St. Andrews. . 261 



Genus Scalpellum, Leach. 



Scalpellum vulgar e, Leach; Darw. Mon. i. p. 222, pi. 5. f. 15. 



On Thuiaria thuja and Sertularia cupressina from deep 

 water. 



Fam. Balanidaj. 



Subfamily B alanine. 



Genus B alan us, 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 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 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 exuviee swarm in the rock-pools and on 

 the surface of the sea' in summer. 



Balanus ffameri, 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. 



Fam. Verrucidse. 



Genus Verkuca, Schumacher. 



Verruca Strdmii, O. F. Miiller; Darw. Mon. p. 518, pi. 21. f. 1. 



Abundant on rocks and stones between tide-marks in the 

 laminarian region, and on crabs in the coralline. 



Order Copepoda. 



Suborder GNATHOSTOMATA. 



Genus Notodelphys, Allman. 



Notodelphys ascidicola, Allman. 



Common in Ascidia intestinalis and others. 



