NATURAL SCIENCES OF PHILADELPHIA. 159 



internal digit. Fourth digit longer than second. Hinder extremity elongate, 

 no tarsal fold ; the digital web extensive, very repand : sole smooth. Two 

 large flat oval metatarsal tubercles, the internal marginal. Skin of under 

 surfaces granular, spiunlose on the thorax. Extremities with acute tubercles 

 above. Dorsal region with obtuse tubercles. Numerous elongate conic warts 

 on the sides, largest on a fold from the paratoid gland to the groin ; such are 

 also found beneath it anteriorly, and upon the angle of the jaws. The para- 

 toid gland is lateral and very small, not more than half the extent of the 

 upper eyelid and is studded with conic warts. Above and behindjt is a deep 

 depression. Length of head and body three inches; breadth acros9 gular re- 

 gion 1 in. 1 line. Length of posterior extremity (along anterior face,) 4 inches. 



Above brownish gray with a few large dark-brown spots, which do not in- 

 terrupt a median line. Extremities dark spotted : a light band between the 

 eyes, and one from the eye to the angle of the mouth. 



Habitat. Turbo region, New Granada. Mus. Smithsonian, (No. 4335.) Dis- 

 covered by Mr. Arthur Schott, of Lieut. Michler's Expedition. 



This species is allied to various others of the section of the genus character- 

 ized by the presence of an occipital process to the supraorbital ridge; which 

 embraces in America, Bufones lentiginosus, ocellatus, nebulifer, 

 dorbignyi, veraguensis, and perhaps sternosignatus. It nearly 

 approaches the veraguensis Schmidt, but differs, first, in the distinctness 

 of the tympanum and large ostia pharyngea ; second, in the very small para- 

 toid gland ; third, in the absence of ridge from lower margin of eye towards 

 paratoid ; fourth, in the less freedom of the tongue. In nebulifer the front 

 is more declive, the canthus rostrales less concave, the paratoids larger, the 

 conical warts absent, the soles and palms tuberculous. 



April 1st, 1862. 

 Mr. Lea, President, in the Chair. 



Thirty-three members present. 



A paper was presented for publication entitled 



Synopsis of the North American Forms of Colymbidae, and Podo- 

 cipidae, by Elliott Coues, which was referred to a Committee. 



Mr. Warner made some remarks on the resemblance existing be- 

 tween organic forms and certain figures produced by optical, acoustic 

 and electrical experiments; also, on the relations existing between 

 these forms and figures and certain mathematical lines mentioned in a 

 pamphlet on organic marphology, published by him. 



April 8th, 1862. 



Vice-President Bridges in the Chair. 



Twenty-three members present. 

 A paper was presented for publication entitled 

 Descriptions of certain species of diurnal Lepidoptera, etc., by Wm. 

 H. Edwards, which was referred to a Committee. 



Dr. Slack called the attention of the members to a colored cast of the head of 

 a gorilla, which he characterized as a new species under the name of Gorilla 



1862.] 



