304 



a number of teeth of the Fossil Horse ; the spot of marshy 

 ground where they were found had, by trenching, been converted 

 into a fine soil for garden crops. Mr. McChesney has been so 

 fortunate as to find two incisors, slender in form ; of the lower 

 jaw, both the first molars, and three out of the next four molars 

 on each side, viz : second, third, fourth, and fifth ; of the upper 

 jaw, the left first molar, and three on each side of the next four 

 molars, — embracing of this animal's teeth seventeen. Of all the 

 Fossil Horse teeth we have seen, there is decayed out of them 

 all the fangs and bony parts, some of the dentine, and in this 

 instance more or less of the ends of the plates of enamel. The 

 length of the enamel of the first upper molar still remaining is 

 1.9 in., ditto the first lower molar is 2.33 in. ; length of longest 

 upper molar is 2.9 in., ditto longest lower molar is 3 in., ditto of 

 incisors, 2 in. 



Dr. Dekay, at the time of the publishing of " The New York 

 State Natural History," had not learned of the discovery of any 

 fossil horse remains in this State. 



Some four or five years since, a lower first molar, in a fine 

 state of preservation, was picked up by the writer's son, George 

 S. Skilton, on the margin of one of the rivers near Troy. 



Dr. J. C. White read a paper on the development of 

 Tapeworms, as follows : — 



GENERATION OF THE HELMINTHES. 



I thought it might not be uninteresting, after the interest 

 evinced by the Society at the last meeting on the subject of the 

 Helminthes of the human body, to give, in a few words, the ideas 

 now prevalent in Germany in respect to their development. 



Let us take the joint or proglottis of a Tcenia solium, and 

 watch it through its phases. We know that it is a perfect indi- 

 vidual by itself, capable of reproducing, and that when mature 

 and filled with eggs it becomes congested, sepai'ates itself volun- 

 tarily from its next younger joint above, and is discharged. We 

 will suppose now that by some means to be presently considered, 

 the eggs regain entrance within the intestinal canal after their 

 wanderings. Each ripe egg or embryo consists of a body armed 



