isn 



]\Ir. M. A. C. Hiuton on 



Allied to P. s/ah)<jitiojyt(ra, Stal, liut with the opercula 

 larger, distinctly narrowed, and obtusely angularly pro- 

 duced at their apices, and there broadly black ; pronotuni 

 niucli narrower between the apices of the lateral angulate 

 margins. 



Synonymical Note. 

 Dalsira crassa, Dist. Ann. & Mag. Nat. Hist. (7) ii. p. 303 (1898). 



Schouteden (Rev. Zool. Afr. ii. p. 107 (1912), in 

 enumerating this species from the Transvaal, writes " cette 

 espece a et6 decrite conime Meiouymia {Dahira ol.) par 

 Di.«^tant." 



I described it as Dalsira (snjira) in 18iJ8, and, as the genus 

 Metonynda was only proposed by Kirkaldy in 1909,1 cannot 

 well be charged with an impos.sibility. 



XVI. — On some liemains of liodenfs from the lied Crag of 

 fiiiffolk and from the Norfolk Fortst-Btd. By Maktin 

 A,. C. HiNTON. 



[Plate VIII.] 



In the present paper some impoitant fossils from the Red- 

 Crag and the Forest-J3ed series of Norfolk are described. 

 These materials appertain to the genera Castor, Troyon- 

 iheriuvi, and Sciurus. 1 have to return my best thanks to 

 Major Moore, of Felixstowe, Mr. A. (J. Savin, of Cromer, 

 and Mr. Gilbert White for the loan or gift of tlie specimens 

 described. 



1. Castor. 

 (a) Castor veterior, Lankester. 



A fragmentary right ramus in the collection of ]\lajor Moore, 

 from the Red Crag ol' Woodbridge, ►SulTolk, is referred to this 

 species. In this specimen (I'l.VlIl. tig. I),"r4, fT^n^ ^i"*' I)''irtof 

 ^1772 are in place. The crown of ,,. j is i'ully developed, while 

 ,„ 1 has well-devcl' ped fangs(fig. 1, ''« "). Each tooth has one 

 outer and three inner folds and, as in C.Jiber^ the enamel is 

 uncriniped. 'JMie outer fold is persistent, as usual in Castor; 

 the anterior and middleinner foldsof ,,. 4 are also long persistent 

 as in C. fiber. The posterior iujier fold of ,,..1 and all three 



