254 oJ. L. Smith on the Lesleyite of Chester Co., Penn. 
side of the first joint is rather more prominent, but the row of 
teeth along the inside is similar, Caudal appendages stouter, 
tapering more rapidly. External male crgans slender, curved. 
outward, swollen at base. The largest female is not mature 
and the egg-pouch contains no eggs; it is small, slender, elon- 
gated, subcylindrical, beaked at the end. 
he largest male gives the following measurements: breadth 
between eyes 3°20"; length of basal joint of claspers 2°81; 
breadth -95; length of second joint 2°24; its breadth at base 
‘76; length of caudal appendages ‘86; width at base 24; 
leneth of sete “76. 
Greenland,—Dr. Chr. Lutken, (from the University Zodlogi- 
cal Museum, Copenhagen.) 
Of this species I have seen but four specimens, which were 
sent to Dr. A. 8. Packard by Dr. Lutken under the name of 
B, paludosus Miiller. The latter appears to be quite distinct, 
to judge from the figures; it is represented as having appenda- 
ges between the claspers, and very slender, linear, caudal ap- 
pendages. In the form of the egg-pouch, and the serration of 
the first joint of the claspers it is similar. 
is species is very closely allied to B. arcticus, and when @ 
larger series of specimens can be examined it may prove to be 
only a local variety, but the specimens studied show differences 
that seems to warrant their separation. 
Art. XXVII.—On the Lesleyite of Chester Oo., Penn., and its 
relations to the Ephesite of the Emery formation near Ephe- 
sus, Asia Minor; by J. LAWRENCE SMITH. 
n., was handed to me for examination by Dr. Isaac 
imen was too impure 
Its character and 
of Science, §. P. Sharples has given an analysis of it, that at 
once brought to my recollection my original opinion that 1 
_ I then obtained from Dr, Lea another specimen of his mineral 
and proceeded to analyze both it and the Ephesite for mutual 
: ting the pure 
