564 MR. G. A. BOULENGER ON REPTILES AND [Nov. 15, 



coloured, the inner colourless and provided with the nuptial excres- 

 cences. This tortion, together with the extreme similarity of the four 

 fingers, renders it difficult to decide, at a first glance, which of the 

 digits are the pre-axial and which the post-axial. The colour of 

 the upper parts is a uniform olive-brown, that of the lower a carneous 

 white. The pupil, in a strong light, is vertically oval ; the iris is 

 much obscured by black pigment, except a narrow golden ring round 

 the pupil. The web between the toes is transparent, with the veins 

 forming beautiful arborescent purplish lines. 



Mr. Boulenger intended to hand over the specimen to Prof. 

 Howes, who, he hoped, would investigate the circulatory, muciferous, 

 and urogenital systems. It was most desirable that such an exam- 

 ination should be made, as nothing was known of the soft anatomy 

 of the DacUjlethridce. 



Prof. Flower exhibited and made remarks on a photograph of 

 a specimen of Rudolphi's Whale {BaltBnoptera borealis), taken in 

 the Thames near Tilbury, on the 18th October last. The sex had 

 been ascertained to be male. 



A letter was read addressed to the Secretary by Dr. Emin Pasha, 

 C.M.Z.S., dated Wadelai, April 15, 1887, referring to some col- 

 lections sent to the British Museum, aud offering some account of 

 his observations on Natural History to the Society. 



The following papers were read : — 



1. A List of tlie Reptiles and Batrachiaus collected by 

 Mr. H. H. Johnston on the Rio del Rey, Cameroons 

 District, W. Africa. By Gr. A. Boulenger. 



[Eeceived June 30, 1887.] 



1. Rhampholeon spectrum, Buchh. 



2. Urobelus gabonicus, a. Dum. 



3. DiPSADOBOA UNICOLOR, Gthr. 



4. CORNUFER JOHNSTONI, Sp. n. 



Tongue with a conical papilla in the anterior part of the median 

 line. Vomerine teeth in two slightly oblique series behind the line 

 of the choanae. Snout rounded, shorter than the diameter of the 

 orbit ; canthus rostralis obtuse ; loreal region concave ; nostril nearer 

 the tip of the snout than the eye ; interorbital space nearly as broad 

 as the upper eyelid ; tympanum half the diameter of the orbit. 

 Digits terminating in triangular expansions, the diameter of which 



