CELLEPORIDJE : LEPEALIA. 317 



Cornwall, C, W. Peach, who says that it is found near low-water 

 mark, and also in deep water. 



The crust of L. verrucosa resembles that of L. pediostoma in thick- 

 ness and colour, and the cells in both are also nearly equal in size : 

 but those of L. verrucosa are more raised in front, their walls are of 

 a thinner texture, and consequently more friable, and, instead of 

 being punctured, the anterior and upper part is smooth, while the 

 base is very prettily areolated. In some specimens the cells are rib- 

 bed longitudinally, the ribs diverging from the summit, but these 

 are easily recognised. The main distinction between L. pediostoma 

 and verrucosa, however, is found in the different shapes and character 

 of the apertures, as given in their respective specific characters. 



Notwithstanding his qviotation of Esper's figure, Lamarck's Disco- 

 pora verrucosa has no relationship to this production. 



23. L. RETICULATA, cbUs ovttl, Iiorizontal, punctured in the 

 septa., the aperture plain, rounded, with a sinus on the proximal 

 side, and a triangular hole behind it. J. Macgillivray. 



Plate LY. Fig. 10. 



Lepralia reticulata, J. Macgillivray in Ann. and Mag. Nat. Hist. ix. 467. 



Hah. On bivalve shells from deep water, rare. 



Crust chalk-white, undefined, punctured, obscurely lineated ; cells 

 horizontal, arranged as usual, ovate, depressed, the walls opaque, 

 roughish, the interspaces coarsely punctured. On a few of the cells 

 there are traces of three spines on the margin of the aperture. 

 Nearly allied to Lep. variolosa, but differs in the more defined limits 

 and shape of the cells, and in the character of their aperture. 



24. L. VARIOLOSA, cells oblong, depressed, roughish, punc- 

 tured in the interstices ; the aperture semi-oval or roundish, 

 with a plain margin. 



Plate LV. Fig. 8, 9. 



Var. a. Lip sinuated on the proximal margin. Fig. 8. 



Var. /3. Lip with a denticle on the proximal margin. Fig. 9. 



Lepralia variolosa, Johns. Brit. Zooph. 278. pi. 34. fig. 4. Hassall in Ann. and Mag. 



Nat. Hist, vii, 367. Couch Zooph. Cornw. 50. Corn Faun. iii. 116. plate 22. fig. G. 



W. Thompson in Ann. Nat. Hist. v. 253. 



Uah. On stones and bivalved shells, common. 

 Crust spreading, closely adherent, even, often roughened in the 

 centre, yellowish or dull greyish white, the space between the cells 



