Molluscoida of St. Andrews. 309 



Lepralia Malusii, Aud. ; Busk, Catal. p. 83, pi. 103. f. 1-4. 

 Not uncommon on shells and stones from deep water. 



Lepralia granifera, Johnst. ; Busk, Catal. p. 83, pi. 77. f. 2, 

 pi. 95. f. 6 & 7. 



Abundant on the under surface of stones near low-water 

 mark in considerable patches. The aspects of the old and 

 new cells differ much. The new cells glisten like those of 

 L. hyaUnaj have a number of opaque white granules, a D- 

 shaped aperture, and a distinct mucro ; the transverse wrinkles 

 of the cells are also apparent ; and in some very new ones the 

 granules are also glistening and hyaline, and show the per- 

 forations. In the old cells the walls are opaque, whitish, or 

 yellowish, the granules still more opaque, perhaps larger, but 

 less defined and beautiful. 



L&pralia hyalina^ L. ; Busk, Catal. p. 84, pi. 82. f. 1-3, 

 pi. 95. f.3-5,pl. 101.f.l&2. 



Common on laminarian roots and stems, on Dehsseria and 

 other algae, and on stones near and beyond low-water mark. 



Family Celleporidae. 



Genus Cellepora, Fab. 



Section A. Incrusting, adnate. 



Cellepora pumicosa, L. ; Busk, Catal. p. 86, pi. 110. f. 4r-6. 



Very abundant on stones, shells, zoophytes, and seaweeds — 

 generally from deep water. 



Cellepora avicularis^ Hincks ; Catal. Zooph. Devon, 

 Ann. & Mag. Nat. Hist. 3rd ser. ix. p. 304. 



Occasionally on zoophytes. 



Section B. Erect, branching. 

 Cellepora ramulosa, L. ; Busk, Catal. p. 87, pi. 109. f. 1-3. 



Attached to the stems of zoophytes &c. in deep water ; 

 common. 



Cellepora dichotoma, Hincks, Catal. Zooph., loc.cit. p. 305. 



On zoophytes ; abundant and fine. 

 Ann. & Mag. N. Hist. Ser. 4. Fo^.xiii. 22 



