CELLEPORIDJ5 : LEPRALIA. 309 



11. L. 4-DE\TATA, ''cells immersed, arranged alternately , 

 apertures quadrangular, and furnished with four short teeth 

 placed near each angle." A. H. Hassall. 



Lepralia 4-dentata, Hassall in Ann. and Mag. Nat. Hist. vi. 171. pi- 6. fig. 5. Mac- 

 yillirray in Ibid. ix. 467. 



Hob. It is enumerated as an Irish species by A. H. Hassall, and 

 has been found on a dead valve of Cyprina islandica, near Aberdeen, 

 by Mr. J. Macgillivray. 



I have seen no authentic specimen of this species. The figure of 

 it, given by Mr. Hassall, would induce us to place it in the genus 

 Membranipora. 



-* -"- "\y a ii o f t^g ce n s granulous. 



12. L. GRANIFEEA, cells ovate, granulous, with an obtuse process 

 or knob in front ; the aperture entire, semi-lunar, with the up- 

 per Up transverse and even. G. J. 



PLATE LIV. FIG. 7. 



Hob. On rocks between tide-marks, rather rare. On slaty rocks 

 in front of the coves of Holy-Island, and in Berwick Bay, G. J. Isle 

 of Man, on old bivalved shells, E. Forbes. Coast of Ayrshire, Rev. 

 D. Landsborough. Coast of Cornwall, C. W. Peach. 



The crustaceous spots formed by this pretty and well-marked 

 species so much resemble those of Lep. tennis that they can only be 

 distinguished by the different character of the cells. These are ar- 

 ranged in a quincunxial fashion, semi-alternate, horizontal, ovate, 

 narrowest at the distal end, the walls of the exterior or newest series 

 glassy, dotted with numerous small perforated granules, and marked 

 with two or three irregular transverse folds ; and there is an obtuse 

 hollow knob above the aperture, a little behind its superior edge. 

 The aperture is encircled by a very narrow rim, entire, constricted, 

 semicircular, the upper side even and straight. 



In the old and central cells the walls become thicker and opaque, 

 and the granules are not so easily to be distinguished. There often 

 appears also, on each side of the aperture, a small projecting loop, of 

 the same character as those which occur in Lep. ansata ; and, in 

 a specimen from the Isle of Man, there are two spines on the inferior 

 oral angles. In this specimen the process above the rim of the cells is 

 perforated or open. The ovaria are globose, opaque, pearly white, 

 and smooth, with a large opening on one side. 



