Zoological Society. 477 



Ptilodictya [Stictopora) fucoides (M'Coy), but the casts of the 

 cells are polygonal instead of oval, and far more minute in the 

 present coral. The extreme minuteness of the parts of this spe- 

 cies distinguishes it easily from the P. subtubulata, to which alone 

 it has any affinity. 



Very common in the fine Caradoc sandstone of Mulock, Dal- 

 quorhan, Ayrshire. 



{Col. University of Cambridge.) 



Retepora Hisingeri (M'Coy). 



Sp. Char. Corallum forming irregular fan-shaped expansions, in- 

 terstices about one-third of a hue wide ; dissepiments narrower 

 than the interstices, fenestrules ovate, slightly angulated, about 

 two- thirds of a line long and half a line wide (five interstices in 

 the space of 2 lines) ; cells very small, from four to seven rows 

 on the interstices, generally about three on the dissepiments 

 (internally forming short ovate cells), about a third longer 

 than wide, obverse, very minutely granular. 



As it is scarcely possible even to determine Hisinger's Retepora 

 reticulata with certainty, as he gives no information relative to 

 the pores, there could be no objection to apply that name to the 

 present species, which agrees with his figure as far as it goes, 

 were it not that Mr. Lonsdale has already applied it to a very 

 similar coral, which he however places in the genus Fenestella, 

 and figures with only the two rows of pores usual in that genus. 



Very abundant in the slates of Cefn Coedog; Cirn y brain, 

 W. of Wrexham ; Blaiu y Cwm, W, of Nantyre, Glyn Ceiriog ; 

 slates of Mynydd Fron Frys, five miles W. of Chirk ; Coniston 

 limestone of Coniston Water Head, Lancashire. 



{Col. University of Cambridge.) 



PROCEEDINGS OF LEARNED SOCIETIES. 



ZOOLOGICAL SOCIETY, 



November 27, 1849.— R. H. Solly, Esq., in the Chair. 



On the evidences of affinity afforded by the Skull in 

 THE Ungulate Mammalia. By H. N. Turner, Jun. 



I had occasion in the introductory part of my communication on 

 the arrangement of the Carnivora *, to make allusion to certain details 

 of structure in the crania of the Pachydermatous and Ruminant Mam- 

 malia ; and I there pointed out a few peculiarities, which clearly di- 

 stinguished the Perissodactyla of Professor Owen, both from the Ru- 

 minant and Non-mrainant Artiodactyla, and also the two latter divi- 



* Ann. Nat. Hist. S. 2. vol. iii, p. 397. 



