8 A MONOGRAPH OF 



7. — Helix ( ) qu^stiosa — Cox. 



Legrand, Col. for Mon., sp. 54. 



Shell with a large open umbilicus ; thin, depressed, dull above, 

 shining below, yellow-brown above, gradually shading off to yellow 

 below ; whorls 4|^ to 5, convex, rapidly increasing in size, the last 

 dilated outwardly, not descending in front ; apex scarcely raised ; 

 aperture elongately ovately-lunar : margins simple, approached, 

 columellar margin slightly dilated. 



Diameter, greatest 0*55, least 0*40; height 0*22 of an inch. 



Habitat. — Oatlands. 



I have not seen the typical specimens. It may be but an extreme 

 variation of H. ruga. , 



8. — Helix ( ) Wynyahdensis. N. Sp. 



Shell with a narrow but deep umbilicus, convexly depressed, rather 

 thick, reddish-brown above and yellowish-white beneath, dull, covered 

 with a thin epidermis ; striated with prominent rounded riblets above 

 and below, the interstices with much finer striae and decussate ; spire 

 small, only very slightly elevated ; whorls 5|-, moderately convex, suture 

 impressed, last large and inflated ; aperture luuately-ovate ; peristome 

 thin, margins approximating, right somewhat depressed ; columellar 

 margin a little expanded. 



Diameter, greatest 11, least 9 ; height, 4 mil. 



Habitat. — Table Cape and Circular Head. 



A shell with much the general appearance of H. Stephensi and H. 

 Ila/miltoni, but the prominent close-set riblets and the distinct difference 

 in the colouration of the upper and lower surface at once separate it 

 from either of its allies. In the latter respect it resembles H. lanipra^ 

 but the likeness goes no further as far as that shell is concerned. I col- 

 lected it in the dense scrub under decaying timber. I regret that I am 

 under the necessity of describing the present shell from dead specimens. 

 When living the bi-coloured character is much more definitely shown 

 than in the specimens before me. I am much adverse to the formation of 

 new species on trifling differences, but in the present instance the varia- 

 tion from the ordinary colouration of H. Stephensi, H. Hamiltoni, and 

 JI. plexus is so constant, and the regular I'ounded riblets form such a 

 decided and conspicuous difference, that I think I am justified in 

 describing the shell as a new and unrecorded species, more particularly 

 as the characters given are invariably constant, without the least 

 deviation from the type. 



