THE SESSILE BAENACLES. 205 



BALANUS HAMERI (Ascanius). 

 Plate 53. 



1765. Lcpas halamis vddcwaUensis Linnaeus, Reisen dui-fli "Wostsotlihmd, 



Erkliirunff die Figuren, pi. 5, fif?. 1, lb. 

 17G7. Lcpas hamcri Ascanius, Icones rernm natiirallum, vol. 1, p. 8, pi. 10.* 

 177G. Leims tvUpa O. F. jMullek, Zoologire Danica Prodromus, p. 251, 



No. 3026. 

 1790. Lcpas foUacca Spengler, Skrivter af Naturhist. Selskabet, vol. 1, 



p. 173. 

 179S. Lepas rosata Bolten, Museum Boltenianum, p. 197. 

 1827. Balanns scoticus Brown, Illustr. Conch. Great Britain and Ireland, 



pi. 6, figs. 9-12. 

 1835. Balamis ttilipa Miiller, T.yetx, Philos. Trans., p. 37, pi. 2, figs. 34-39 



(Uddevalla, west coast of Sweden). 

 1835. Balanus vddcvaUcnsis auct., Lyell, Philos. Trans., p. 37. 

 1844. Balanus Candidas Brown, 111, Rec. Conch. Gt. Brit., ed. 2, p. 121, pi. 



54, figs. 9-12. 

 1854. Balanus hamcri A.scanius, Darwin, Monograph on the subclass Cir- 

 ripedia, Balanidae, p. 277, pi. 7, figs. 5«-c; Monograph of the 



fossil Balanidte and Verrucidfe of Great Britain, p. 24, pi. 1, 



figs, la-d; pi. 2, figs, la, &. 

 1866. Balamis hamcri Ascanius, Leidy, Proc. Acad. Nat. Sci. Phila., 1S66, 



p. 237 (Bangor, Maine, Led a clay). 

 1872. Balanus hamcri Ascanius, Dawson, Canadian Naturalist, vol. 6, 



p. 402. 

 1889. Balanns hamcri Ascanius, Dawson, Canadian Record of Science, 



vol 3, p. 287 (distribution in the Pleistocene of Canada). 

 1900. Balanus hamcri Ascanius, Weltner, Fauna Arctica, vol. 1, p. 303, 



pi. 8, figs. 14, 1.5. (Distribution). 

 1913. Balanns hamcri Ascanius, Stei>hensen, Medelelser om Groenland, vol. 



51, p. 71 (North Stroemfjord, Greenland). 



Type-locality. — Finmark. 



Distrihutlon. — Northern Europe, south to the English Channel; 

 Nova Scotia to off the month of Chesapeake Bay, IG to 107 fathoms; 

 southward only in deep water. 



The barnacle is large, cylindrical, or somewhat tapering, some- 

 times enlarging upward; the walls white, under a yellow cuticle 

 which covers parietes and radii ; compartments smooth, 'very weahly 

 cemented togetJier and to the strong calcareous basis. Orifice large, 

 deeply toothed, radii very broad, covered with epidermis, with 

 smooth, strongly oblique, straight summits and smooth sutural 

 edges. Aire broader with arched summits, the edge with a narrow 

 longitudinal groove in some indi\'iduals, obsolete in others. Sutures 

 not in the least septate or denticulate. Sheath smooth, its lower 

 edge overhanging, leaving very narrow cavities. The parietes below 

 the sheath are longitud'mally finely and sharply rihhcd throughout, 



1 I Lave been unable to consult the original edition of tlie first part of the Icones of 

 Ascanius, and quote the reference from the reprint of 1772. 



