On a Native Phosphate of Iron, Manganese and Lithia. 99 
it is rather wiger, owing to the smaller distance between the 
eyes. ‘The depression limiting on either side this medial region 
terminates anteriorly in the line of a fissure in the upper margin 
of the orbit between 10 and 20. 
It is interesting to trace these regions in other families of the 
Brachyura; but this we reserve for another occasion. Snffice it 
0 say, that in Atelecyclus, which is broader anteriorly than pos- 
teriorly, 3M is much elongated, 1P is as long as broad, and there 
are the normal teeth with others intermediate. In Calappa in 
which the posterior part of the carapax is broadest, the medial 
region is comparatively small, and does not reach back quite to 
the middle of the carapax. 1P i s oblong instead of transverse. 
7 In the Maiade, the medial region is usually large, while the 
3 antero-lateral is very narrow anteriorly. 1e prominent lateral 
Spine or tooth oe aeane and is usually far back of the 
feltioonts outward and backward in these men extends 
more forward following the outline of the medial region and then 
bending outward along the — between LL and 2L, 3L, 
or between 21, 3L, and 5L, 4. In the former case the region 
of the tooth E is anterior to the am or depression, and in the 
latter, the regions of both E and N. Traces of the depression 
separating the antero-lateral and postero-lateral regions are also 
often apparent in this group. 
Arr. XIUL—Chemical examination of a Phosphate of Tron, 
Manganese, and Lithia, from Norwich, Massachusetts ; by 
. J. Craw, of the Yale Analytical Laboratory. 
THis mineral from Norwich, afforded me the following blow- 7 
pipe Searaters. Fuses vg in the ahha “Disol¥ with intu- 
Be on EE ie 
1. 41:35 27:36 2470 trace 2:27 1-97 trace 207, —— 0-29=100°01. 
2. ote 26-02 23-30 trace 2:20 161 trace 207 030100714. 
1:21 0°46 
780 7-07 
