ANIMALS. 21] 
Genus Macrocheilus, Phillips. 
This is a provisional genus typified with the so-called Luccinum 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. 
MacrocueEILus syMMEtRicus, King. De Verneuil, Bull. Soc. Géol. de France, 2™ série, 
vol. 1, p. 35, 1844. 
= — » Geol. Russ., vol. i, p. 225, 1845. 
ss = », 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 little more than a third of the shell in length.” 
(iing.) 
This species resembles some of the shells identified with the Buccinum acutum of 
J. Sowerby. A specimen, figured by Professor Phillips in the ‘Geology of Yorkshire’ 
(vol. ii, pl. 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 Luwomphalus, J. Sowerby. 
Diagnosis. —“ An involute compressed univalve; spire depressed on the upper 
part; beneath concave, or largely umbilicated. Aperture mostly angular.” (J. 
Sowerby.) 
KuoMPHALUS PERMIANUS, A7ng. Plate XVII, figs. 10, 11, 12. 
Diagnosis.—Minute: twice as wide as it is high: smooth: flatly convex on the 
upper side. Umbilcus rather large. Aperture suborbicular; slightly pressed in by 
the body whorl. 
Luomphalus Permianus 1s 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. 
