40 PROCEEDINGS OF THE ACADEMY OF [1819. 



same structure, in equal definiteness and perfection, as Hie larger 

 castes. Allusion was also made to the ravages of these destructive 

 insects, and some of the modes for exterminating them were ex 

 plained. 



February 18. 



The President, Dr. Ruschenberger, in the chair. 



Thirty persons present. 



A paper entitled " On the Structure of the Chimpanzee," by H. 

 C. Chapman, M. D., was presented for publication. 



On Bothriocephalus lotus. Prof. Leidy exhibited specimens 

 of a tape worm, which had been submitted to him for determina- 

 tion b}' Dr. John T. Walker. The specimens consist of about a 

 dozen portions of what appear to have been four or five individu- 

 als, all of them unfortunately without the head. They were dis- 

 charged by a man, aged 28 years, formerly a farmer, a native of 

 Sweden, who came to this country about three months since. At 

 irregular intervals during the last five years the patient passed 

 fragments, of a few inches, of the worm. According to Dr. 

 Walker, the collective measurements of the specimens presented 

 he had estimated to be upwards of 100 feet. In their contracted 

 condition, as preserved in alcohol, none of the mature segments 

 measured over 4 mm. in length by 10 mm. in breadth. These are 

 quite characteristic of Bothriocephalus lotus. The egg pouches 

 of the uterus centrally situated are rendered distinct from the 

 ripe eggs which give to them a chocolate-brown appearance. The 

 genital apertures are in the median line, nearer the anterior bor- 

 der of the segments. Jn Taenia, the genital apertures are at the 

 lateral margin of the segments. 



The specimens were regarded as of special interest from the cir- 

 cumstance that they were the first of the Bothriocephalus lotus, 

 that Prof. L. had had the opportunity of seeing from a person 

 living in our country. 



February 25. 

 The President, Dr. Ruschenberger, in the chair. 

 Twenty-seven persons present. 



Asphalt urn and Amber from Vincenttown, N. J. Mr. E. Gold- 

 smith remarked that he had received from Col. T. M. Bryan a 

 specimen of asphaltum, a mass of which, weighing about a hun- 

 dred pounds, had been found in the ash marl, a layer above the 

 green sand proper, about 16 feet from the surface, in the neigh- 



