554 NATURAL HISTORY MISCELLANY. 
species. A much smaller species is the atten punctulata Olivier 
(Fig. 7), which is dark bronze, and spotted on the elytra with white 
dots, in place of the more usual white dots ae curved lines or lu- 
nules 
GEOLOGY. 
Tur CrinomaL BANKS OF CRAWFORDSVILLE, INDIANA.—Montgomery 
County, of which Crawfordsville is the county seat, belongs to the Sub- 
carboniferous formation, being just north of the northern out-crop of 
the Indiana and Illinois coal-fields. A large part of the country is COV- 
ered with heavy drift. Rocks in as pe er, crop out abundantly 
along Rock (Sugar Creek on some maps) River and its tributaries. 
These rocks are rich in fossils nice Memmi ot the Sub-carboniferous 
strata: varieties of Productus, Spirifer, Terebratula, Conularia, etc. 
But the fossils which have excited the most interest, and which 
have rendered aie locality specially noted, are the beautiful Crinoi- 
dea. Along the banks of this river are strata of limestone, made up 
almost entirely of the broken stems and arms of Crinoids, cemented 
by carbonate of lime, and occasionally ait heads finely pre- 
rved. 
But the geological horizon in which the heads of Crinoids are mostly 
found, is a calcareous shale or sandstone, of quite limited vertical ex- 
tent, not much exceeding two feet in thickness, and often but six or 
eight inches. In this the Crinoids are siriehant: and in great perfec- 
tion, the arms and basal plates being well preserved, with stems at- 
tached, and not unfrequently even the finest tentacula. They are 
mostly of the following types: Actinocrinus, Cyathocrinus, Agarico- _ 
crinus, Platycrinus, Forbesiocrinus, Scapiocrinus, Zeacrinus, and Pen- 
tremites. These Crinoid beds have been rougit by some of the citi- 
Corey. He 
furnished beautiful specimens to the Smithsonian Institution, 
Harvard University, Yale College, Michigan University, Wabash Col-- 
lege, and also to many private cabinets. These beds have been ex- 
plored also by the students and professors of Wabash College, who 
have enriched her cabinet with choice specimens e College sê- 
, by purchase of Mr. Corey, several hund ‘eile of perfect gt 
. finely wrought out, fit for the cabinet. The bank nearest to 
fordsville is the most productive, but the same strata are found chy? 
ping out at Island Ford, on Offil’s Creek, on bigot sa on Blac 
Creek, as as well as at several other points on Rock Riv 
The most ive excavations have been ‘iin b Mr. Charles 
