CELLErORFD^ : LEPRALIA. 305 



grejish-white, roiigbish, composed of cells large enough to be readily 

 distinguished by the naked eye : the cells are horizontal, cylindrical, 

 arranged in rather irregular series, sometimes semialternate, and 

 sometimes opposite and parallel, the walls smooth, thick, dull and 

 opaque ; the aperture wide, marginated, subcircular, with a small 

 sinus above, and a large open tubercle or kuob on each side looking 

 forwards. Ovarian operculum smooth, situated below the aperture, 

 where it mimics the swollen lobe of the flower of a Calceolaria. 



The species is related to the Australasian Cellepora allata of La- 

 mouroux; (Expos. Method. 2, tab. 64, fig. 10, 11.) but, in my opi- 

 nion, has no affinity to the Cellepora hiimtcronata of that author. 

 For this reason I have changed the name to one which may serve to 

 commemorate the researches of a natui'alist who has done much to 

 extend our knowledge of this interesting genus. 



5. L. SIMPLEX, cells ovate, ventricose, smooth, the aperture 

 circular, raised, with an even somewhat thickened rim. G. C. 

 Hjndman. 



Plate LIV. Fig. 4. 



Hob. — On various bivalve shells, dredged at Sana Island, July 

 1841, by G. C. Hyndman. Apparently not rare. 



Spots irregular, dull greyish- white, formed of a congeries of cells, 

 which are very distinctly defined and isolated, contiguous and ar- 

 ranged in the usual quincunxial fashion, although some of them are 

 oftener out of their ranks than in any other species. Cells ovate, 

 narrowed in front, ventricose, raised or semi-erect, the parietes rather 

 thick and even, neither punctured nor warted ; the aperture a plain 

 circular opening, whose rim is a little thickened and frequently 

 everted. There is an obtuse knob behind the margin of the upper 

 lip. In the space between the cells there are, in some specimens, a 

 few irregular punctures. 



6. L. VENTRicosA, cclls distiuct, ovato-glohose, narroimd in 

 front, roughish ; aperture suhquadr angular ivith a mucro on 

 the proximal margin, and four obtuse spines on the sides. 

 A. H. Hassall. 



Plate LIV. Fig. 5. 



Lepralia ventricosa, Hassall iu Ann. and Mag. N. Hist. vii. 412. 



Hah. — " Collected in the bay of Dublin : it is likewise found on 

 the English coast at Burnham, Norfolk," A. II. Hassall. Coast of 



X 



