*" 624 Messrs. G. K. Glide and B. B. Woodward on 



tlie zygomata less boldly thrown out, especially anteriorly. 

 Upper outline less stroiioly bowed. Muzzle long-er, the 

 nasals longer and more parallel-sided, less contracted in 

 front and behind, Inlerorbital region with its edges more 

 openly concave, the strong back-to-back concavities of 

 the orbital ( dges far less abruptly contrasted. Brain-case 

 narrower. Choanse deeply and sharply V-shaped, instead of 

 beii'g more or less irregularly rounded. Bullae as in 

 hoUoiensis. 



Incisors rather less strongly bevelled off laterally, this 

 lesulting in a different curvature of the cutting-edge. 



Dimensions of the type (those of the animal recorded by 

 the collector on the label of the skull) : — 



Head and body 232 mm. ; hind foot 36 ; ear 21. 

 Skull : median uj)per length 53'3 ; condylo-incisive length 

 49; zygomatic bieadth 3r2 ; nasals 18'3x7"3 ; interoibital 

 breadth 12; breadtli ofbriiin-case 20'7 ; palatilar length 23'5 ; 

 length of bulla 12o ; upper molar series (crowns) 11' 7. 



Hab. Lowlands of S.E. Bolivia. Type from San Antonio, 

 Parapiti, Bolivia. Alt, 600 m. 



Ti/pe. Adult skull (female). B.M. no. 21. 11. 6. 20. 

 Original number 64. Collected 18th January, 1921, and 

 presented by the Mmquis de Wavrin. A younger skull also 

 examined. 



IV^ieving it to be a common and well-known animal, the 

 Marquis did not send a skin of this cavy, but its skull shows, 

 as might be expected, sutficient differences from that of the 

 true Galea boliviensis of the high Bolivian plateau (altitude 

 3000 to 4000 m.) to indicate that the lowland form is different 

 subspecifically. The skull-differences are very similar in 

 type to those which I found in the genus Gaviella to charac- 

 terize the different subspecies of C. ausfraHs. 



LXIV. — Some Emendations to their Recent Paper " On 

 Helicella, FSrussac." By G. K. GuDE, F.Z.S., and 

 B. B. WOODWAED, F.L.S. 



It has been pointed out to us that some regrettable oversights 

 occur in our paper " On Helicella, Ferussac " (ProG. Malac. 

 Sor. xiv., Oct. 1921, pp. 174-190), which it is desirable to 

 rectify without loss of time. 



In the multitude of changes and rearrangements entailed 

 in preparing the paper it was not observed that under the 



