Mr. G. A. Boulenn:er on a new liutrachian. 521 



'fa 



Fig. 8. A specimen of n gloniernto Tiirbinarinn, fihowing three periods of 

 prowth. 



I'l.ATK XX. 



Fig. 1. A peoulinr moilifiojitioii of a youn).' cup e.\hibited by a specimen 

 iu the Xiitional CoHection, wliich appears to bo the first atage 

 in the method of j^Towth shown in the next fif.'ure. 



Fig, 2. A spt'cimeu rt-niarkahk' for the reguhirity and siymmetry of its 

 method of foKlin^'. For the letters see next lijrure. 



Fig. 2 a. Diafrramuuitic horizontal section, to explain the method of 

 folding. The letters mark the edges seen in the actual specimen. 

 c and d are secondary outgrowths somewhat obscuring the 

 original folding. 



Fig. '^. Three types of protuberant calicles, showing the principal 

 methods iu which the coeuenchyma is raised by them. 



Fig. 4. Diagram to illustrate the principles of clixssitiiation proposed as 

 regards tlie form of the calicle. a, the margin of the calicle ; 

 i, an imaginary half-radius circle ; i, four septa which do not 

 reach the half-radius circle ; ~, a single septum reaching the 

 half-radius circle ; 3^ septa crossing the half-radius circle. 

 Between the septa at 1 the iuterseptal loculi run over into the 

 fuiTOWs of the ccenenchyma ; at ~ and 3 they are sharply 

 bounded peripherally, and show diil'erent shapes of interseptal 

 loculi. 



LXI. — Description of a neio Botrachian (Oreophryne Quelcliii) 

 discovered hi/ Messrs. J. J. Quelch and F. J\lcConneU on the 

 Summit of Mount Eoraima. By G. A. Boulengeh, F.K.S. 



Oreophryne, gen. nov. {Engystomatid.) 



Pupil horizontal. Tongue elliptical, entire, and free behind. 

 Pahate smooth. No tympanum ; eustachian tubes extremely 

 minute. Fingers and toes short, blunt, without distinct web; 

 foot for grasping, the inner toe oppo.'^able and longer than 

 the second. Coracoids and prrecoracoids very strong, the 

 former forming an extensive suture with tlie latter in the 

 middle and enclosing on each side a rather small circular 

 foramen ; no omosternum ; sternum cartilaginous. Diapo- 

 physes of sacral vertebra strongly dilated. 



The genus Oreophryne is nearest allied to Atelopns^ U. & B., 

 from which it is, however, well distinguished by the stronger 

 praicoracoids and the curious conformation of the foot, which 

 recalls that of the llyloid genus PhyUomeduaa. 



Oreoj)hryne Qnelchii. 



Physiognomy of Bufo [Phryniscus) nigricans, Wgm., or 

 Atelopus Stelzneri, Wey. Snout short, rounded, not promi- 

 Ann. tO Mag. N. Hist. Ser. 6. Fo7. xv. 36 



