314 POLYZOA INFUNDIBULATA. 



ringens, acumine medio supra infraque prominet, et denticulis duo 

 longioribus inferis erectiusculis instructum, hinc quasi quadriden- 

 tatum." 



18. L. FiGULARTs, cells distiuct, the back crossed ivitli 4< or 5 

 lines of punctures, and encircled with a series of marc/inal 

 stomata ; aperture suhquadrangular^ unarmed. C. W. Peach. 



Plate LVI. Fig. 2. 



Hah. — On a muchi decayed bivalved shell, sent from Cornwall by 

 C. W. Peach. 



Crust irregularly defined, rather thick, dull and opaque, chalky- 

 white, composed of rows of semi-alternating horizontal cells distin- 

 guishable by the naked eye : cells a little separated from each other, 

 barrel-shaped, horizontal, flattened on the upper side, which is 

 crossed with five or six impressed and slightly curved series of mi- 

 nute punctures, while a row of large mammillated punctures are set 

 round the sides. There are about twelve of these, which may be 

 compared to the spiracles of insects, or the stommata of the leaves of 

 plants ; and I have not observed them in any other species. Down 

 the centre of the back of the cell there is usually a more or less evi- 

 dent keel. Aperture subquadrangular, with a smooth slightly 

 thickened margin, and partially closed with a membranous tongue- 

 let ; the remains of the polype's operculum. Ovarian capsules large, 

 shaped like the inferior lobe of the Calceolaria, and marked with a 

 lunate impressed spot on each side in front. 



Allied to Lep. annulata, but the cells are larger, and the pattern 

 on which they are moulded is much more beautiful. 



19. L. BiFOKis, cells sub-globular., distinct, punctured on the 

 sides and forwards, with a lunate hole in the back ; aperture 

 subquadrangidar or lunate, the upper Up straight and trans- 

 verse, the lower rounded. W. Thompson. 



Plate LV. Fig. 4. 



Cellepora Macry, W. Thompson in Ann. and Mag. N. Hist. x. 20. 



Hah. Parasitical on the tunic of an Ascidia from Strangford 

 Lough, 1839 ; and on old bivalved shells from Portaferry, W. 

 Thom-pson. On Pecten maximus, dredged between Larne and 

 Glenarm, co. Antrim, R. Patterson. It is not a rare species. I 

 have specimens on sea- weed, and a beautiful specimen on the bark of 

 a tree sent me from Ayrshire by the Rev. D. LmuUhorough, 



