CALYPTII/ED.E. 57 



Thin, flat, wide, round, finely striated, with the apex sharp 

 and turned backwards. C cornea^ Brod., f. 5, 36, and C. 

 varia, Brod., f. 6, cannot be definitely distinguished, and 

 from Mr. Broderip's own remarks in the Linngean Transac- 

 tions, it may be inferred that they are probably only varieties 

 a little irregular in growth. They take ' almost every shape 

 that a calyptra3a can assume.' The ends of the divided 

 cyathus are described as more pointed in the more normal 

 C. cepacea. But these are also subject to great variation. 



10. STELLA, f. 27, Reeve. — Orbicularis complanata, liris 

 radiantibus subdistantibus et interstitialibus minutis concen- 

 trice decussatis stellata; apice subcentrali depresso, appendice 

 parva. — Eound, flat, with distant radiating ridges and inter- 

 stitial decussated areas, giving a star-like appearance to the 

 surface. The appendage is very small in the specimen figured. 



11. POEOSA, f. 51, 52, Reeve. — Elevato-conica rotunda 

 tenuis, radiatim costata ; interstitiis foveolatis ; apice valde re- 

 trorso, acuto, appendice interna lanceolata. — Raised, radiately 

 and roughly ribbed, pitted between the ribs ; apex bent towards 

 the back margin. 



12. ALBA, f. 10-15, Martini. — Solidiuscula, tenuissime 

 striata, alta, varie corrugata et tortilis ; apice retrorso. — The 

 first figures, pi. 13, f. 117, 118 of Martini's Lepas alba 

 certainly represent forms of this crumpled species, which, 

 according to the particular character or degree of the tor- 

 tuosities exhibited, are divided into the species tortilis and 

 Martiniana, f. 10, 11, diaphana, f. 12, fibulata, f. 13, and 

 balanoides, f. 14, 15. 



13. PAPTRACEA, f. 16, 17, A. Ad., fid. Reeve. — ^/6cesimilis, 

 sed oblique elevatim elongata. — The shell figured by Reeve 

 differs less from C. alba than our f. 16, 17. Both may quite 

 possibly represent very elongated distortions of the previous 

 species. 



14. COREUGATA, f. 42, 43, 44, Broderip. — Orbicularis, de- 

 pressa, rudissime radiatim costata, costis nodosis et divaricatis ; 

 apice obtuso subretrorso ; facie interna concentrice et leviter 

 nodosa. — Orbicular, depi-essed, very roughly radiately ribbed ; 

 ribs nodose and divergent ; apex obtuse and drawn towards 

 the back; interior surface concentrically and smoothly 

 nodose. 



