CELLEPORID^ : LEPRALIA. 303 



angustato tenninali limbura quasi radiatum faciunt ; infimis dimi- 

 diatis tantum paginam inferiorem strati formantibus. Oscula sim- 

 plicia, sine dentibus, vixque marginata." 



The Cellepora hyalina of Cavolini is undoubtedly a different spe- 

 cies. Hence it has become impossible to quote with any advantage 

 the works of subsequent systematists, for they have almost invariably 

 copied the character given by Linnaeus of the species, and referred us 

 to the figure of Cavolini as its representation ! The Cellepora 

 hyalina, of Delle Chiaie is likewise a distinct species, nearly allied to 

 our Lep. granifera. 



I think it likely that Delle Chiaie's Cellepora personata (Anim. 

 s. vert. Nap. iii, 39, tav. 34, fig. 17, 18) is founded entirely on the 

 ovarian capsules of C. hyalina. 



The Lep. hyalina, Lieut. Thomas writes me, is common in Ork- 

 ney, where he meets with two varieties viz. 1. with the tubes or cells 

 touching, and 2. with the cells separate, and the intermediate space 

 largely punctured. Mr. Peach has sent me specimens of both varie- 

 ties from Fowey harbour. 



2. L. TENTHS, cells ovate, smooth, with an entire constricted 

 circular aperture, separate or wide apart, and surrounded with 

 a series of large punctures placed in the interspaces. A. H. 

 Hassall. 



PLATE LIV. FIG. 2. 



Lepralia tenuis, Hassall in Ann. and Mag. N. Hist. yii. 412. L. vinca, Couch Corn. 

 Faun. iii. 116. pi. 22. fig. 7. L. catenata, Peach MSS. 



Hob. On rocks and shells. Dublin Bay, on Laminaria digitata, 

 A. H. Hassall. Not uncommon on the coast of Cornwall, from 

 deep water, C. W. Peach. On shells of Lima fragilis and Pecten 

 opercularis dredged off Sana Island by Mr. Hyndman, W. Thompson. 



Polypidom in small thin patches, with an uneven or sinuated 

 outline, closely adherent, and usually of a silvery white colour : cells 

 radiating from the centre, not distinctly rowed, horizontal, small, 

 neat and ovate, separate or apart, the walls of young cells very 

 thin, membranous, pellucid and smooth, the aperture round or with 

 a straight margin on the proximal side : the subcalcareous basis or 

 space between the cells perforated with numerous round or oval 

 holes, forming a sort of chain around each cell. Ovaries rather 

 small, smooth, and glossy, conoidal, projected in front of the cell, 

 and perforated on the apex. 



