i <ii!iiiiiiiiin.«iiii,-i iii i,it iiiiiii:ii»tiiiuii<i<iiii|t||i!i ii!;ii!ii.'i;iii>iiiiiiiitiHii!iiii<' 
COLLECTIONS 
Thin Sections showing their Internal Structure. 
| These sets are carefully selected with a view to giving the student an 
§ Idea of the subject. Prior to 1875 the interesting and very important 
| study of Palaeozoic Bryozoa had been almost totally neglected, and it is 
only during the last ten years that they have received the attention due 
1 them from palaeontologists. In that time the use of thin sections has 
| enabled us to make great progress in the systematic arrangement of this 
| wonderfully prolific class of fossils. Indeed this progress has been so 
| rapid that it is not too much to assert that to-day the subject compares 
I more than favorably with any of the other branches of palaeontology. 
| Volume viii of the Illinois Geological Survey reports (now in press) will 
| contain a complete revision of the subject, illustrated by 50 lithographic 
| plates and numerous cuts. The collections here offered at the following 
| reasonable prices constitute a nearly indispensible adjunct to that work. 
COLLECTION NO. 1. 
ioo species (300 specimens) of the principal genera of fossil bryozoa 
and 100 glass slides, 1x3 in. containing nicely mounted thin sections of 
60 species represented in the collection. ..... $70.00. 
COLLECTION NO. 2. 
150 species (420 specimens) of palaeozoic, jurassic cretaceous and recent 
bryozoa and an illustrative set of 200 thin sections contained on 150 glass 
slips 1x3 in... $100.00. 
A copy of the “American Palseozoic Bryozoa,” a preliminary work on 
the subject, sent free with each collection. 
COLLEGE ORDERS ESPECIALLY SOLICITED. 
For further information, address, 
E. O, ULftlCH, 
3NTe*wport, 
1 Diii.iiiiiiiiiiitiiiiiiiiiitiiiiiiiniiii! Mi: i:!i:;iiii!iiiiiiiiiiiiiiiiiiiiiiii tiimiaiiEiii.'iiiitiiiiii igimiii i'HiU!iaiiiiiiiiiiiiiiiiiiiiiiiiniiiiiii!t|i 
