G24 Messrs. G. K. Gude and B. B. Woodward on 



the zygomata less boldly thrown out, especially anteriorly. 

 Upper outline less strongly bowed. Muzzle longer, the 

 nnsals longer and n)ore parallel-sided, less contracted in 

 front and behind. Interorbital region with its edges more 

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

 the orbital edges far less abruptly contrasted. Brain-case 

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

 being more or less irregularly rounded. Bulla3 as in 

 holiviensts. 



Incisors rather less strongly bevelled off laterally, this 

 )esulting in a different curvature of the cutting-edge. 



Dimensions of the ty))e (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 31*2; nasals ]8'3x7*3 ; interorbital 

 breadth 12; breadth of brain-case 20'7 ; palatilar length 23'5 ; 

 length of bulla 12'5 ; upper molar series (crowns) 11' 7. 



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

 Parapiti, Bolivia. Alt. 600 m. 



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

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

 presented by the Maiqiiis de Wavrin. A younger skull also 

 examined. 



l^elieving 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, sufficient differences from that of tlie 

 true Galea boUviensis of the high Bolivian plateau (altitude 

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

 subspecifically. The skull-differences are very similar in 

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

 terize the different subspecies of C. australis. 



LXIV. — Some Emendations to their Recent Paper " On 

 Hehcella, FSrussac:' By G. K. GuDE, F.Z.S., and 

 B. B. Woodward, F.L.S. 



It has been pointed out lo us that some regrettable oversights 

 occur in our paper "On Helicella^ Ferussac " (Proc. Malac. 

 Sur. xiv., Oct. 1921, p}). 174-190), which it is desirable to 

 rectify without loss of time. 



In the multitude of changes and rearrangements entailed 

 in preparing the pa|)er it was not observed that under the 



