1.^2 THE AMERICAN MONTHLY [Apr 



elong-ate and become sharply pointed. They fuse in two 

 groups and form the bipolar spindle in the same manner 

 as that observed by Osterhout in Equisetum, The mature 

 spindle is characterized by the great length and crossing 

 of the mantle-fibres. The spindle-formation of the second 

 division is identical with that of the first division. No 

 bodies that could be identified as centrosomes were found 

 in any stage of the process.— Gz/. Acad. Set, 



DIATOMS. 



Slides. — Strewn-slides of Diatoms can be obtained from 

 P. Klavsen, Denmark, containing- diatoms from 174 locali- 

 ties as follows : Numbers 1-44 are fossil, Nos. 51-174, re- 

 cent. A collection of 100 of these slides can be had for $14.00. 



1 Cement-stone i, Fur, Denmark, 2 Cement-stone ii, Fur, 

 3 Moler, Mors, Denmark, 4 Szt, Peter, Hung-ary, 5 Kekko, 

 Hung-ary, 6 Szakal, Hung-ary, 7 Felso-Eszterg-aly, Hun- 

 g-ary, 8 Simbirsk, Russia, 9 Ananino, Russia, 10 Kusnetzk, 

 Russia, 11 Hainspach, Bohemia, 12 Chatovin, Bohemia, 13 

 St. Flora, Italia, 14 Moron, Spain, 15 St. Monica i, Cal. 16 

 St Monica ii, 17 Redondo Beach i, Cal, 18 Redondo Beach ii, 

 19 St Maria, Cal, 20 San Pedro, Cal, 21 San Pablo, Cal, 22, 

 Lompoc, Cal, 23 Los Ang-ele;?, Cal, 24 Richmond i, Va, 25 

 Richmond ii, 26 Petersburg-, Va, 27 Notting-ham, Md, 28 

 Popes Creek, Md, 29 Atlantic City i, N. J., 30 Atlantic City 

 ii, 31 Beach Haven, N. J., 32 Hatfield swamp, N. J., 33 New- 

 ark, N. J., 34 Bedding-ton, Me, 35 Hopkmton, N. H., 36 

 Mejillones i, Chile, 37 Mejillones ii, 38 Barbados, 39 Ce- 

 ment-stone i, Sendai, Japan, 40 Cement-stone ii, Sendai, 41 

 Abashiri, Japan, 42 Oamaru i. New Zealand, 43 Oamaru ii, 

 44 Wernamo, Sweden. 



Marine. 51 Frederiksvaerk, Denmark,52 Frederikssund, 

 Denm, 53 Thisted, Denm, 54 Vejle, Denm, 55Strib, Denm, 

 56 Fano, North Sea, 57 Sylt i. North Sea, 58 Syltii, 59 Hu- 

 sum. North Sea. 60 Cuxhaven i. North Sea. 61 Cuxhavenii, 

 62 Marstrand i, Sweden, 63 Marstrand ii, 64 Corsica, 65 

 Cette, France, 66 West Falmouth, Mass, 67 Mobile Bay, 

 Ala, 68 Appalachicola Bay, 69 Morris Creek, Conn., 70 New 



