220 Mr. L. Reeve on the genus Scarab us. 



does certainly not exhibit his usual accuracy in determining the spe- 

 cific identity of the Scarabi ; both this species and the Scarabus cas- 

 taneus are given as synonyms of Lamarck's Auricula scarabceus (Sca- 

 rabus imbrium). (Fig. 4.) 



5. Scarabus Lessoni, De Blainville, Diet. Sci. Nat., pi. 48. f. 32; 



Lesson,Voyage de laCoquille, Zoologie, vol. ii. p. 334. pi. 10. f.4. 

 Auricula Petiveriana, var. Deshayes. 



Deshayes appears to have quoted this species as synonymous with 

 the former, an error which he might easily have avoided by com- 

 paring Lesson's figure of it with the old Cochlea Bengalensis of 

 Petiver. It approaches rather to the Scarabus imbrium, the type of the 

 genus, and no doubt was confounded with that species before it was 

 distinguished under the above title by De Blainville. (Fig. 5. and 8.) 



6. Scarabus lekithostoma, Nobis, n. s. 



Besides its general peculiarity of form, this shell is further distin- 

 guished by the colour of the mouth, which is a bright yelk-yellow. 

 (Fig. 6.) 



7. Scarabus Petiverianus, De Ferussac, Prodrome, p. 101 ; Petiver, 



Gazophylacia Naturae, pi. 4. f. 10. 

 Cochlea Bengalensis, Petiver. 

 Auricula Petiveriana, Deshayes. 



A species distinguished from the rest of the genus by the rotun- 

 dity of the aperture, and I believe the most rare of the series. I only 

 know of one specimen at present. (Fig. 7.) 



8. Scarabus striatus, Nobis, n. s. 



Auricula scarabceus, Quoy, Voyage de l'Astrolabe, Zoologie, vol. ii. 

 p. 162. pi. 13. f. 24. 



We can hardly be surprised at the little attention given to the 

 Scarabi by M. Quoy, for this is the only species found by him during 

 his Voyage in the Astrolabe. Not having sufficient to make the ge- 

 nus of interest, he must have adopted the old Linnsean specific with- 

 out comparison. In all the specimens I have seen of this shell, the 

 longitudinal striae so perfectly delineated in his figure are highly cha- 

 racteristic. (Fig. 9.) 



9. Scarabus castaneus, Lesson, Voyage de la Coquille, Zoologie, 



p. 336. pi. 10. f. 7. 

 This is the only species I have not succeeded in identifying : the 

 figure given by Lesson, here copied, represents a clear chestnut- colour- 

 ed oblong shell, approaching nearest in form to the Scarabus pyrami- 

 dalus, but perfectly distinct as far as I am enabled to judge. (Fig. 10.) 



10. Scarabus imbrium, De Montford, Conch. Syst., vol. i. ; De 

 Ferussac, Prodrome, p. 101 ; Chemnitz, Conch., vol. ix. pi. 136. 

 f. 1249 and 1250. 



Helix scarabceus, Linnaeus. 

 Helix pythia, Muller. 

 Bulimus scarabceus, Bruguiere. 

 Auricula scarabceus, Lamarck. 



This is as it were the normal species of the group, and may be re- 

 cognised by its large size and slight pyramidal form. (Fig. 11.) 



