CELLEPORID.E : LEPRALIA. 315 



Polypidom in the form of a white, roughish calcareous crust hav- 

 ing a tendency to spread circularly, formed as usual of an aggrega- 

 tion of horizontal cells, arranged in quincunx, distinct and ventricose, 

 ovato -globose, slightly bulged at the middle, the walls either vitreous 

 or opaque, punctured round the sides and near the oral extremity, 

 leaving the central part smooth, where there is a very distinct lunate 

 hole with a raised margin : aperture of the cell subquadrangular, 

 straight and even on the upper margin, the lower rounded, either 

 smooth or with a spine on each side not longer than its own diame- 

 ter ; but these spines form no essential character, for specimens of 

 the polypidom occur in which not a single cell possesses them. I 

 have other specimens from Mr. Peach with three divergent spines on 

 the lower lip. Ovarian capsules globular, pearly-white, smooth. 



20. L. PEACHII, cells crowded, globose, distinct, perforated 

 with oblong punctures, principally around the base ; aperture 

 sub-quadrangular with a mucro on the proximal lip, and 

 several short denticles on the distal margin. 0. W. Peach. 



PLATE LV. FIG. 5, 6. 



Hdb. Not uncommon from deep water on stones and shells, C. 

 W. Peach. On Limse dredged off Sana Island by G. (7. Hyndman. 



Forms a calcareous spot without any definite outline, closely ad- 

 herent : cells crowded, rather small, distinct, but contiguous, globose, 

 the walls opaque, perforated with numerous oblong punctures ar- 

 ranged in a sort of circle round the base, smooth towards the aper- 

 ture. In the great majority of the cells the spines of the lower lip 

 are broken off, so that a series of punctures there is all that can be 

 seen, but in other cells the short spines are very apparent. They 

 appear to be five or six in number. In a specimen on the external 

 surface of a shell I find the lip perfectly smooth, the development of 

 the spines probably having been hindered by its exposed situation. 

 But it is to be remarked that the absence or presence of spines is 

 not absolutely specifical in this genus. 



21. L. PEDIOSTOMA, cells barrel-shaped, th 

 punctured all over; the aperture raised, gaping, oblique, cal- 

 ceoliform, with a plain rim. A. H. Hassall. 



PLATE LV. FIG. 7. 



Flustra hibernica, Hassall in Ann. and Mag. Nat. Hist. vi. 172. pi. 7. fig. 1 ; and 

 vii, 370. The figure quoted " represents a posterior view of the cells, the wall of 



