Crustacea of St. Andrews. 261 



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. Balanidje. 



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^ Brugui^re; Darw. Mon. ii. p. 261, pi. 6. f. 6. 

 I^ot uncommon on Ilya^ 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 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. 



Fam. VerrucidsB. 

 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, Alhnan. 



Notodelphys ascidicola, AUman. 



Common in Ascidia intestinalis and others. 



