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Mr. R. T. Lowe on new Species of Cyclostoma. 115 
2. C. Neritoides. 
T. avato-conoidea nitida solidiuscula distinete angulato-carindta 
subimperforata s. rima angustissima strictissima v. fere clausa, 
griseo-fulva vel chalybeo-ccerulescens ; spira conica subabbreviata, 
anfr. convexo-planatis spiraliter obsoletissime et transverse exilis- 
sime creberrimeque striolatis, ultimo majore subventricose ; sutura 
distincta haud impressa; apert. spiram subzequante. 
Long. 5-54, diam. 43-5 mill.; apert. 23, spira 3 longa; anfr. 43. 
Hab. in Maderze sylvaticis humidis ad alt. 2000 fere ped. loco 
** Lombo da Vaca”’ dicto ad S. Vicente orze Septentr. Mader. 
Possibly merely an extreme form of C. lucidum 8, but pecu- 
liar in idloneing and habit, as well as shape and contour. I 
possess only three examples, found by myself in July 1850. 
Smaller than C. lucidum 8. Spire more conical, with straight 
sides and flattened volutions. Colour very peculiar, dark fulvous- 
grey or purplish liver-brown approaching to black, with a metallic 
steely lustre, and suffused, or blotched and marbled, with pale 
straw-colour. Opercle bright sienna-red or reddish chestnut. 
There is something in the colour, shape, and habit of this 
pretty little shell, reminding one of Littorina Neritoides (L.). 
3. C. flavescens. 
T. pyramidato-conoidea sericeo-nitens tenuis distincte angulato-cari- 
nata subimperforata s. rima angustissima strictissima y. fere 
clausa, pallide stramineo-flavescens v. virescens unicolor; spira 
subpyramidata subproducta, anfr. planiusculis spiraliter distincti- 
uscule tenuissimeque et transverse exilissitne creberrimeque strio- 
latis y. subtilissime reticulatim decussatis, ultimo vix majore sub- 
ventricoso; sutura distincta hand impressa ; apert. spira distincte 
breviore. 
Long. 53-6, diam. 4—5 mill.; apert. 23, spira 3} longa; anfr. 5. 
Hab. in Madere sylvaticis dumosisve humidis ad alt. 3000 fere 
ped. convallium Rib. Frio et Rib. da Metade, cum C. lucido a et 
f commixta. 
Possibly a mere elongated form of C. Neritoides; but, besides 
the more produced spire and pyramidal shape, it also differs in 
its thinner, lighter shell, of a uniform pale brown or straw- 
colour, with sometimes a greenish tinge. The opercle is bright 
sienna-red or reddish chestnut. 
About two dozen examples of this shell occurred in a bag 
containing many hundred specimens of C. lucidum (principally 
var. 8), collected by me in August and September 1849, along 
the Levada in the above-named ravines. I had considered it to 
be the male of C. ducidum, on account of its more pyramidal or 
slender form; and, notwithstanding the obvious discrepancies 
expressed above in the diagnosis, I am by no means clear that it 
may not eventually prove to be so. 
8* 
