Miscellaneous. fS85 



perhaps the two forms may be included under the latter name in 

 Europe. In one the mouth is deeply trilobed, and the animal is 

 usually green with chlorophyl-globules. In the other the mouth is 

 crenulate, usually with six shallow crenulations, and the animal is 

 devoid of ehlorophyl. The former is usually the smaller, and may 

 be distinguished by the name of D. lobostoma ; the latter may be 

 named I), crenulata. 



In an old brick-pond, on the grounds of Swarthmore College, 

 Delaware County, among Diffiugia pyriformis, D. spiralis, D. corona, 

 D. acuminata, and others not yet determined, there occurs an abund- 

 ance of a large species, apparently uudescribed. It is sometimes 

 the fourth of a line in length, and is compressed pyriform ; but is 

 quite variable in its relation of length to breadth and in the shape 

 of the fundus of the shell. This is often trilobate ; but, from the 

 non-production of one or more or all the lobes, differs in appearance 

 in different individuals. The animal is filled with chlorophyl-grains, 

 from which it might be named D. entochloris. 



Another large Diffiagia, allied to D. lageniformis, is not unfrequent 

 about Philadelphia. The shell is beautifully vase-like in shape ; it 

 has an oval or subspherical body, with a constricted neck and a re- 

 curved lip to the mouth ; the body of the shell opposite the mouth 

 is acute and often acuminate. The animal contains no ehlorophyl. 

 One shell measured ^ of a line long by |- of a Hue broad ; another 

 measured \ of a line long by \ of a line broad. The species may 

 be named D. amphora. 



A Difflugian, found in a spring on Darby Creek, is interesting from 

 its transparency, which allows the structure of the animal to be seen 

 in all its details. The investment is membranous and apparently 

 structureless ; the soft granular contents occupy about one half of 

 the investment, and are connected with this by long threads ; the 

 pseudopods are protruded iu finger-like processes. The form of the 

 animal is compressed ovoid, with the narrow pole truncate and 

 forming the transversely oval mouth. It is probably the species 

 Di^fflugia ligata, described by Mr. Tatem, of England. Its length 

 is about ^ig- of a line. The character of the investment is so different 

 from that of ordinary Difiiugiaus that the species may be regarded 

 as pertaining to another genus, for which the name of Uatharia 

 would be appropriate. — Proc. Acad. Sci. Philad. 1874, p. 77. 



On the Skull of the Leopard (Leopardus pardus). 

 By Dr. J. E. Gray, F.E.S. &c. 



The skulls of the leopard in the British Museum, from different 

 localities, vary very much in size, and I think w^ill probably, if they 

 are carefully studied, prove to belong to more than one species 

 when specimens, obtained from well-ascertained localities, are 

 accompanied by the skins of the animals from which they are 

 obtained. 



The skulls received from Southern xVfrica are much the largest. 

 The specimens from Continental India are of intermediate size ; and 

 a scries of skulls which were formerly cojitaiucd in M. Lidth de 



