ANIMALS. 21 1 



Genus Macrocheilus, Phillips. 



This is a provisional genus typified with the so-called Buccinum breve of Sowerby. 



The following shell is placed in the genus, because it appears to have some resem- 

 blance to certain species stationed in it by Professor Phillips ; though it must be 

 confessed, that there is just as much reason for placing it in Phasianella. 



Macrocheilus symmetricus, King. Plate XVI, figs. 32, 33. 



Mackocueilus symmetricus, King. De Verneuil, Bull. Soc. Geol. de France, 2"" serie, 



vol. i, p. 35, 1844. 



— — ,, Geol. Russ., vol. i, p. 225, 1845. 



— — „ Tennant, Strat. List, p. 89, 1847. 



— — „ King, Catalogue, pp. 12, 13, 1848. 



EuLiMA SYMMETRICA „ Howse, Trans. T. N.F. C, vol. i,^p. 241, 1848. 



Diagnosis. — " Fusiform : smooth. Whorls slightly .rounded. Mouth oval, more 

 rounded in front than behind, and a httle more than a third of the shell in length."^ 

 (King.) 



This species resembles some of the shells identified with the Buccinum acutum of 

 J. Sow^erby. A specimen, figured by Professor Phillips in the ' Geology of Yorkshire' 

 (vol. ii, pi. xvi, fig. 11), has a close similarity to it: in the Permian fossil, however, 

 the spire is a little more produced. My largest specimen measures three quarters of 

 an inch in length. 



It is of rare occurrence in the Shell-limestone at Tunstall Hill, and Humbleton 

 Quarry. 



Genus Euomphalus., J. Sowerby. 



Diagnosis. — " An involute compressed univalve ; spire depressed on the upper 

 part; beneath concave, or largely umbilicated. Aperture mostly angular."" (J. 

 Sowerby.) 



Euomphalus Permianus, King. Plate XVII, figs. 10, 11, 12. 



Diagnosis. — Minute: twice as wide as it is high: smooth: flatly convex on the 

 upper side. Umbilicus rather large. Aperture suborbicular ; slightly pressed in by 

 the body whorl. 



Euomphalus Permianus is a very minute species : my largest specimen does not 

 exceed one sixteenth of an inch in width. At first I took it for the young of a 

 Pleurotomaria ; but was soon convinced of its belonging to a distinct genus, as none 



1 Catalogue, p. 12. 



^ Mineral Conchology, vol. i, p. 97. 



