(hi (I ntw Species o/'Paludestrina. 191 



apecies, except that there is a marked notch at the coutre of 

 the inner basal ein;^uhim of the U|)pcr canines, visible in the 

 buccal aspect of the teeth. The very considerable dilFercnce 

 in the actual size of the teeth is shown in the following 

 table :— 



P. lierotis, P. TmmhulU, 



mm. nun. 



Uppor incisors, coinbineil bri'adth at base . . 3'8 3"3 



I'ppor canino, li>n<jfth fmiu c'in;,'iihnn ante- 

 riorly '>•;{ 4-0 



I'ppor ranine, preatest diameter at base, 



horizontally 3-9 2*8 



I.arj.'-e premolar and first two molars, com- 



biniHl lenjrtii S-o 6*8 



Lower canine, heipht from cingnlum ex- 

 ternally •")-4 4-0 



Fir-st lower jiremolar, transverse diameter. . 2*2 1'6 



First lower molar, transverse diameter .... 2'i) 1*9 



Specimens of P. perotis from Bolivia [Bridges) and Lagoa 

 Santa [Reinhardt) have teeth agreeing closely in size with 

 tho.se of the example measured, which came from Cordova 

 [White). 



Forearm of the type (the epiphyses not yet fully united) 

 73 millim. 



Hah. Para. 



Type. Skin. B.M. no. 99. 11. 2. 1. Collected 7th June, 

 1898, and pre.'^ented by J. Trumbull, Esq. 



XXIII. — Xotice of a Species o/'Paludcstrina new to the British 

 Fauna. By Edgar A. Smith. 



In October last year Mr. Lionel P. Adams sent for my 

 inspection a number of specimens of a very small species of 

 Palndesirina which had been obtained in the canal at 

 Dukinfield, Cheshire. 



Three weeks later other specimens were forwarded to me 

 by Mr. F. Taylor, of Oldham, who informed me that he was 

 the first to discover the j)resence of this siiell at the above 

 locality. 



It is certaiidy quite distinct from the other British species 

 and at present has not been identified with any foreign form. 

 It has been suggested by Mr. Adams and otlu'rs that possibly 

 it may be an introduction from North America, having been 



14* 



