220 BALANID.E. 



11. Balanus oaleatus. PL 3, fig. 4 a — 4 c. 



Lepas galeata (?) Linnaus. Mantissa altera Holmia?, 1771. 

 Conopea elongata. Say.* Journal of Acad. Nat. Sci. Philadelphia, 

 vol. ii, part 2, p. 323, 1822. 



Parietes not porose ; basis porose. Tergum, with the apex 

 square, caused by the great development of the articular ridge. 



Hab. — Charlestown, South Carolina ; Florida; West Indies ; Central America ; 

 attached to Gorgonise ; Mus. Brit., Agassiz, Cuming, Stutchbury. 



General Appearance. — This and the two following species come so 

 close in general appearance to the last, that it will be quite superfluous 

 to do more than describe the few points of difference. The shell and 

 basis are generally quite as much elongated as in the last species, and 

 sometimes much more so, owing to the carinal end (fig. 4 a), with the 

 corresponding portion of the basal cup, being produced like the rostral 

 end, into a flattened, sharp point : I have seen a specimen in this state 

 *9 of an inch in length, and only # 25 in breadth in the broadest part. 

 In many specimens, however, the shape is exactly as in B. calceolus ; 

 but the rostrum seems less usually furrowed from clasping the stem of 

 the Gorgonia. The colour is paler, pinker, and more distinctly striped 

 longitudinally than in B. calceolus ; I have, however, seen some not- 

 striped, purple specimens (and one transversely freckled with white) 

 from the West Indies. The parietes are strongly-ribbed internally, and 

 are not permeated by pores. The radii have their sutural edges crenated. 

 The basal cup is permeated by pores. 



The Scutum differs from that in the last species, only in the pit for 

 the lateral depressor muscle, being much shallower, and less defined, 

 and in the apex being truncated. The Tergum is remarkable from its 

 broad, square, truncated summit, which underlies the whole broad apex 

 of the scutum: the square summit of the tergum is formed by a great 

 and peculiar development of the uppermost part of the articular ridge. 

 The spur is a little narrower than in B. calceolus. 



Mouth : on the crest of the labrum there are two teeth on each side 

 of the central notch. The mandibles have five teeth, of which the two 

 lower are very small. The maxillae show a trace of a notch under the 

 upper large pair of spines ; near the inferior angle there are two long 

 spines. Cirri : in the first pair, one ramus is nearly twice as long as 

 the other : the segments are not very protuberant. There is a sharp 

 point at the dorsal basis of the penis. The branchiae are of moderate 

 size, and plicated on one side. 



* If I have assigned the specific title of galeatus to the wrong species, yet 

 Say's name of elongatas ought not strictly to be admitted; as the Lepas 

 elongata of Gmelin is a Balanus, — probably a variety of Balanus crenatus. I 

 may add, that as the Lepas galeata of Schroter ('Einleitung in die Concb.'&c), 

 was attached to a Gorgonia from the East Indies, it cannot be our present species, 

 but probably is one of the three other allied species, which all occur in India. 



