312 Dr. A. Giintlier on Batracliians from Perak, 



On the dorsal surface of the auricles there is a pit about 

 0*03 millim. deep, and 0°025 millim. in length and breadth, 

 diminishing downwards, which is cut off from its surround- 

 ings bj a sharp and fine contour. At the bottom of the pit 

 numerous nervous fibres enter from the subcutaneous nervous 

 plexus, and these run to a reniform body which occupies the 

 middle third of the depression. This body is of fibrous struc- 

 iure, and the fibres composing it are apparently confusedly 

 ntermixed. With picrocarmine it stains yellowish red, and 

 much more intensely than the dotted substance which other- 

 wise resembles it in appearance. From the free surface of 

 this body arise a number of setse, about 0*025 millim. in 

 length and 0*002 millim. in thickness, which project beyond 

 the cilia of the surrounding epithelial cells. At their free 

 extremities these filaments are furnished with small knobs. 

 The inferior third of the pit is only partially filled by the en- 

 tering nerve-fibres ; the rest is occupied by a large cell about 

 0'008 millim. in diameter, possessing a distinct nucleus which 

 only stains faintly. As to the function pertaining to this 

 organ I am quite in the dark ; it is perhaps a tactile organ. 



Hitherto I have been unable to find any other terminal 

 apparatus of the nerves either in Triclades or in Rhabdocoela, 

 with the exception of the tactile apparatus at the anterior ex- 

 tremity of the body in GroffiUa muricicola^ ah'cady described 

 by me in detail ; nevertheless I have often been able to trace 

 the nerves as far as the epithelium. The only other things 

 that I might mention are the small pale pencils which I have 

 found among the epithelial cells of the auricular processes in 

 Planaria gonocephala^ and which are perhaps connected with 

 nerve-fibres. 



XLI. — Notes on Batracliians from Perak. 

 By Dr. i^.GiJNTHEii, F.R.S. 



[Plate XVI.] 



Mr. L. Wkay, Jun., of the Perak Museum has again for- 

 warded to the British Museum a small collection of Batra- 

 cliians which supplies some additional information for our 

 knowledge of the Reptilian fauna of the interior of the Malayan 

 Peninsula. I beg to offer the following notes on some of the 

 species sent. 



