22 A. E. Verrill — Additions to the Fauna of the Bermudas. 



Orchestia agilis Smith. 

 Keport U. S. Fish Com. for 1871 and 1872, I, p. 555 [261], pi. iv, fig. 14, 1873. 



This abundant New England Amphipod occurs in equal abundance 

 at Bermuda, under deca} r ing sea-weeds at high-tide mark, on all the 



shores. 



CIRRIPEDIA. 



Balanus declivis Darwin, var. cuspidatus, nov. 



Balanus declivis Darwin, Mon. Cirripedia, ii, p. 275. pi. vii, figs. 4o-4d, 1854. 

 (West Indies.) 



Our specimens differ as a variety from the typical form described 

 by Darwin, in having the summit of the rostrum divided into 4 or 6 

 acute denticles ; it is very convex and considerably incurved. The 

 summit of the carina is bilobed by a narrow incision. The base is 

 membranous and very obliquely placed, owing to the downward pro- 

 longation of the rostrum, as in the type. 



Long Bird Island, on the flats, imbedded in a blackish, massive 

 keratose sponge (Spongia, sp.), which often lives half buried in 

 the calcareous sand at low tide, and which also harbors a small 

 Alpheus and several isopod crustaceans. 



This is a very singular barnacle, remarkable for the peculiar 

 oblique membranous base, and the pointed basal end of the rostrum, 

 which are characters developed to suit its mode of life, imbedded up 

 to its aperture in sponges. The type was from the West Indies, in 

 sponges. 



Tetraclita porosa (Gm.) Darwin. 



Darwin, Mon. Cirripedia, ii, p. 330, pi. x, figs. 1-lm, 1854. 



This is the common, small, sessile barnacle found on the rocks 

 between tides, with the general appearance of some species of 

 Balanus. It can easily be distinguished by the 4 -parted shell. 



Catophragmus imbricatus Sowerby. 



Sowerby, Genera of Recent and Fossil Shells, Plate. Darwin, Mo nog. Cirrip., 

 ii, p. 490, 1854. 



Plate VIII. Figures 8, 9. 



Several specimens of this interesting barnacle were found on 

 littoral rocks. They are all young (about ."> to 8 mm in diameter) and 

 agree well with the young one described by Darwin, from Antigua. 

 The eight primary mural plates are pointed and surrounded and 

 partially concealed by about three alternating whorls of smaller, 

 pointed plates, rapidly decreasing in size exteriorly. The opercular 



