36 Cen eA SULA 
Natural History in New York (Cat. No. 4257). Although very 
similar to C. striatus Ag., it probably belongs to a distinct species. 
C. monroet, sp. nov. (Fig. 3) —The type of this species is a 
small, imperfectly preserved tooth found by Mr. C. E. Monroe 
in the Hamilton of Milwaukee. The drawing reproduced here- 
with is made up from both halves of the counterpart containing 
the specimen. Traces of striae appear in places, but are nearly 
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Fic. 2. Cladodus monroei sp.nov. Hamil- Fic. 3. Supposed cone-scale from Kinder- 
ton limestone; Milwaukee, Wisconsin. hook fish-bed at Burlington, lowa. X 2. 
x7: 
obliterated by decay of the enamel and dentine, and portions of 
the crown and base are broken away. The crown is robust, 
being very thick at the base, and the external denticles are pro- 
portionately stout. Three cusps of small size intervene on each 
side between the principal cone and external denticles. The 
total height may be estimated at about 1.3, and the width of 
base at 2aS irae 
Other Corniferous forms occurring in the same horizon at 
Milwaukee are teeth and plates of Onychodus, spines of Machaer- 
acanthus, and Chimaeroid remains. Macropetalichthys and Aster- 
osteus, however (which on account of their cranial osteology and 
lack of dentition we must now exclude from Arthrodira and 
place with the Ostracoderms as degenerate Elasmobranch off- 
shoots), are conspicuously absent. 
