(SECT. F), BALANUS AMARYLLIS. 279 



sometimes be very easily confounded with B. eburneus, and I have re- 

 ceived the two species under this one name from Massachusetts: 

 generally B. Hameri may be distinguished from B. eburneus by the 

 smoothness of the summits of its radii, and by the so-called epidermis 

 being of a darker yellow. 



With respect to the fossil specimens from the glacial deposits, I have 

 little to add ; I have seen one from Uddevalla, as already remarked, 

 four inches in height, and a lateral compartment broader by one fourth 

 than the same compartment in any recent specimen. As Sir C. Lyell 

 remarks (Phil. Transact.), the compartments are always found sepa- 

 rated, which is accounted for by their weak union in a recent state. 

 This species, when fossil, is usually associated with its deep-water 

 congeners B. porcatus and crenatus, as at the present day. 



I must here mention that I have examined a considerable number of 

 separated compartments, without opercular valves, brought from Bar- 

 badoes, in the West Indies, showing the existence there of a closely 

 allied or possibly identical species. The only difference which I can 

 point out in these compartments is, that the parietes are rather thicker, 

 and the radii rather narrower, with more oblique summits : some of 

 the compartments are two inches in length. It seems very improbable 

 that the true B. Hameri should extend to the West Indies, but after 

 what has been seen in the case of B. crenatus, this is possible. 



33. Balanus AMARYLLIS. PI. 7, fig. 6 a — 6 c. 



Shell striped or clouded with pinkish-purple, or quite 

 white; radii narrow, ivith their oblique summits smooth or 

 arched : basis porose. Scutum plainly striated longitudi- 

 nally : tergum with the spur narrow* 



Var. (a):* bright rosy pink, not distinctly banded longitudinally. 



Hab. North-east coast of Australia. 

 Var. (b): snoiv white, glossy; orifice deeply toothed. 



Hab. — Mouth of the Indus ; East Indian Archipelago ; Philippine Archi- 

 pelago ; Moreton Bay, and the north-east coast of Australia. Attached fre- 

 quently on ships' bottoms, associated with B. tintinnabulwm and amphitrite. 

 Sometimes attached to Gorgonice with B^calceolus. 



General Appearance. — Shell steeply conical, with the orifice sub- 

 rhomboidal, moderately large, very slightly, or deeply notched : surface 

 very smooth : white, longitudinally banded with pinkish or leaden 

 purple, with sometimes a purplish, sometimes a yellowish tint, the 



* This variety perhaps is the B. roseus of Lamarck, as figured in Chenu, 

 "Ulust. Conch." Tab. 2, fig. 9 ; but as Lamarck does not even notice such con- 

 spicuous external characters as the longitudinal striae on the scuta, and the 

 smooth rounded edges of the radii, it is impossible to identify his species. 



