AfiT. 12 CLASSIFICATION OF COKODONTS ULRICH AND BASSLER 5 



of the surface are reproduced perfectly and can be viewed under the 

 microscope without exhibiting any crystalline structure of the am- 

 monium chloride. The white sublimate can be removed by simply 

 blowing the breath upon the object so coated. The hydrochloric 

 acid and ammonia used should be of great strength to secure the best 

 results. Small quantities only should be employed so that the bottle 



Fig. 1. — Apparatus for preparation of Ammonium Chloride Sublimate 



can be emptied and dried frequently, as the reagents not only absorb 

 moisture but lose their strength in a day of use. 



CLASSIFICATION 



Our classification of the conodonts is summarized in the follow- 

 ing table. Descriptions of the new families and new genera with text 

 figures illustrating their characteristics are contained in the follow- 

 ing systematic descriptions. 



Class PISCES 



TYPICAL CONODONTS (teeth of primitive fishes) 



Family DISTACODIDAE, new family 



DhtacodvH Hindc, 1879 [Macliaiiodus Pander, 1856, preoccupied; 

 Machairodla Smith, 1V)()7) ; Acodu.s Pander, 1856; Acontiodus Pander, 



