68 



HBLICID.'E. 



Corilla rivolii, Frauenfeld, Verb. K. K. zool.-bot. Ges. xix, 1869, 



p. 87(3; TiTon, Struct. Concli. iii, 1884, p. 33, pi. 94, fio-. 24; 



Pilsbry, Man. Couch, ser. 2, ix, 1894, p. 148, pi. 41, figs. 20-22 ; 



Glide, Science Gossip, n. s. iii, 1890, p. 91, figs. 8, 9 (shell and 



armature). 

 Helix (Atopa) rivolii, Tryon, Man. Conch, ser. 2, iii, 1887, p. 156, 



pi. 33, figs. 11, 12. 



Original description : — " H. testa alba, vitrea, utroque latere 

 concavo-planulata, ellip.soidea ; spira irregular], superne striata, 

 inferue Isevigata ; anl'ractibus gjratis, ultimo majore, ad a|oerturam 

 depressis ; apertura dilatata, tuba3formi obliqua, rotundato-semi- 

 lunari, intus quinquedentata; dente coUumellari alteris longiore." 



Major diam. 23-25, minor 16-5-17, alt. 6-25-7 mm. 



Hab. Ceylon {Templeton) ; Kandy (NevilJ, Preston). 



"When describing Helix rivolii in 1830 Desbayes was probably 

 unaware of tbe fact tbat the shell figured by Ferussac as Hellv 

 carabinata Mas identical with his o^^•n. In 1838, however, when 

 editing the second edition of Lamarck's ' Animaux sans Yertebres,' 

 he ackno\\ledges Ferussac's name and relegates rivolii to the 

 synonymy, reversing the process when editing Ferussac's Hist. 

 Nat. Moll. (vol. i, p. 7, 1839), where he states that doubtless 

 Ferussac had provisionally so-named the species, and that he has 

 searched the dictionaries in vain for the meaning of the word 

 carabinata. For this reason he thought it advisable to retain for 

 the species the name he liad himself proposed for it in 1830. 

 While a fe\\- of the older authors adopted Ferussac's name, every 

 one dealing with the species since 1850 lias recognized Desbayes' 

 designation. Although Ferussac did not give a description and 

 livx-aison x, containing plate 51 B (numbered 101 in some copies) 

 on Avhich the species is figured, had no text with it, two sheets 

 of ' Explication des Planches ' were issued \\\\\\ livraison xvi in 

 1822 *, on page iii of which the name H. carabinata duly occurs. 



Under these circumstances Ferussac's name must be adopted. 



Fig. 25. — Corilla carahlnata. 



b ,1 \m 



Fig. 26. — Corilla carahinaia imm&tnre. 



In fig. 25 a the parietal and palatal barriers are exposed from 

 behind, while fig. 25 & shoA\s the median parietal fold joining the 

 callus at the aperture and the anterior terminations of the upper 



* A copy of this is in my possession. 



