THEOBALPirS. 41 



tlie species from being eoiifomicled with any allied form, such as 

 C. oiinuhitKm and C. stcnostoma, which possess a similar operculum. 

 The impressed spiral stritc are coniined to the inner slope of the 

 whorl, towards the suture, and are only visible under a lens." 

 {Benson.') 



This description Benson subsequently amplified* as follows : — 

 " Peristomate vortieali, integro, expansiusculo, subreflexo, su- 

 perne duplicato, lamella exteriore ibidem subangulato. 



" Diam, major 13, minor 10, axis 5^ mill." 



61. Theobaldius ravidxis, Benson. 



Cyclvstotna raviditm, Benson, A. M. N. H. ser. 2, viii, 1851, p. 190; 



Pfeifter, Coneh.-Cab., Cvclostomaceen, 1854, p. 385, pi. 50, figs. 



14-16. 



Cyclophorus ravidus, Pfeiffer, Zeits. Malak. viii, 1851, p. 144 ; id., 



Cat. Phaneropn. Brit. Mus. 1852, p. 70; id., Mon. Pueum. 



1852, p. 99; Benson, A. M. N. H. ser. 2, xiv, 1854, p. 415; 



Adams, Gen. Rec. Moll, ii, 1855, p. 280 ; Reeve, Conch. Icon. 



xiii, 1861, Cyclophorus, pi. 20, ti^. 102 ; W. T. & H. F. Blanford, 



J. A. S. B. xxx, 1861, p. 364; Blanford, J. A. S. B. xxxviii. 1869, 



p. 143; Hanley & Theobald, Conch. Ind. 1875, p. 42, pi. 105, 



tigs. 5, 6. 



Myxostoma ravidu^n, Theobald, Cat. Shells Brit. India, 1876, p. 37. 



Cyclophorus {Theobaldius) ravidus, Ne\ill, Hand I^ist, i. 1878, 



p. 276 ( +var. anamuUayensis and var. tcynaadensis). 

 Theobaldius i-avidufi, Kobelt & Mollendoriff, Nachr. Deuts. Malak. 

 Ges. xxix, 1897, p. 105; id., Cat. Pneum. 1899, p. 17 ; Kobelt, Das 

 Tierreich,Lief. 16, 1902, p. 95; id., Conch. -Cab., Cyclophoridae, 

 i, 1907, p. 568. 

 Original description : — "Testa aperte umbilicata, subdiscoidea, 

 nitidiuscula, coufertim scabre tenuiter radiato-sf riata, olivaceo- 

 lutea, sub epidermide alba; spira vix elevata, apice planato, 

 obtuso, sutura impressa ; anfractibus 4 convexiuscnlis, lente ac- 

 crescentibus, ultimo cylindraceo, antice vix descendente, superue 

 prope suturam sub lente obsolete spiraliter striato ; apertura 

 obliqua, circular!, peristomate teinii, recto, marginibiis callo tenui 

 junctis ; umbilico lato, perspectivo ; operculo tenui, corneo, 

 multispirato, extus concaviusculo. 



" Diam. major 1"), minor 13, axis 7 mill." 

 IJab. India : Nilgiris (Jerdon, Blanford) ; Kolamullay {Blan- 

 ford) ; Anamullay Hills, Wynaad, Hattingh, Battenpathi; Sheva- 

 roy Hills {Beddome). 



" The species differs from C. anmdatum, Troschel, which has a 

 similar operculum, in Ihe more closely-wound wliorls, in the 

 narrower umbilicus, more delicate sculpture, and absence of any 

 pattern on tiie upper side."' {Benson.) 



Blanford states f that the species attains a considerably larger 

 size in the Anamullay Hills and the "Wynaad than the type, 

 shells from the former locality measuring 27 mm. by 22 mm., and 



* A. AI. N. H. ser. 2, x, 1852, p. 271. 

 t J. A. S. E. XXX. 1861, p. 143. 



