310 POLYZOA LNFUNDIBULATA. 



13. L. LANDSBOROVII, cells horizontal, coalescent, ovate, with 

 thin granulous walls, the aperture large, circular, with a deep 

 sinus on the upper margin. Rev. David Landsborough. 



PLATE LIV. FIG. 9. 



Hah. On Pecten opercularis from the coast of Ayrshire, Rev. D. 

 Landsborough. 



Polypidom forming a thin, white, and closely adherent circular 

 crust, of the size of a wafer : the cells rather large, horizontal, conti- 

 guous, ovate, semi-alternate, with the walls thin, glassy, and hyaline, 

 thickly dotted with small perforated granules ; the aperture some- 

 what prominent, oblique, patulous, unarmed, circular, sinuated on 

 the proximal side, and in the centre of this sinus there is usually a 

 small mucro. 



I have dedicated this very rare species to my friend the Rev. 

 David Landsborough, for many years minister of the parish of Ste- 

 venston, but now the pastor of those of his former flock who are mem- 

 bers of the Free Church of Scotland. He published in 1828, 

 " Arran : a Poem, in six cantos." Edin. 1828, a very pleasing work, 

 in which the biographer might find easily a correct portraiture of the 

 author's mind and tastes. He is the author of one or more other 

 volumes, and of numerous essays in our religious and Natural History 

 periodicals : and in Natural History has made many interesting dis- 

 coveries, of which this Lepralia is the least. White, of Selborne, 

 has never had a worthier, or more intelligent and more amiable 

 disciple. 



14. L. AURICULATA, cells coalescent, short, rhomboidal, bound- 

 ed ly a fine and very distinct line ; the aperture small, circu- 

 lar, plain, with an arched sinus on the proximal side. A. H. 

 Hassall. 



PLATE LIV. FIG. 8. 



Lepralia auriculata, Hassall in Ann. and Mag. N. Hist. ix. 412. 



Hob. On shells. Trawled up off Bray. Found on oyster-shells 

 from Burnham, Norfolk, A. H. Hassall. On a valve of Pecten max- 

 imus, dredged off Scilly by Mr. MacAndrew. 



Crust white, closely adherent, spreading circularly, with an un- 

 finished lined margin : cells semi-alternate, conjunct, horizontal, 

 swollen a little in the middle, short and quadrangular, or rather 

 rhomboid, well defined by the septa, which form a distinct boundary ; 



