Mr. R. T. Lowe on new Species of Cyclostoma. 115 



2. C. Neritoides. 



T. ovato-conoidea nitida solidiuscula distincte 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 subventricos© ; sutura 

 distincta haud impressa ; apert. spiram subsequante. 



Long. b-o\, diam. 4^-5 mill. ; apert. 2f, spira 3 longa ; anfr. 4£. 

 Hab. in Maderse sylvaticis humidis ad alt. 2000 fere ped. loco 



" Lombo da Vaca" dicto ad S. Vicente orse Septentr. Maderse. 



Possibly merely an extreme form of C. lucidum ft but pecu- 

 liar in colouring and habit, as well as shape and contour. I 

 possess only three examples, found by myself in July 1850. 



Smaller than C. lucidum ft 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 v. fere 

 clausa, pallide stramineo-flavescens v. virescens unicolor ; spira 

 subpyramidata subproducta, anfr. planiusculis spiraliter distincti- 

 uscule tenuissimeque et transverse exilissime creberrimeque strio- 

 latis v. subtilissime reticulatim decussatis, ultimo vix majore sub- 

 ventricoso ; sutura distincta haud impressa ; apert. spira distipcte 

 breviore. 



Long. 5^-6, diam. 4-5 mill. ; apert. 2j, spira 3J longa ; anfr. 5. 

 Hab. in Maderse sylvaticis dumosisve humidis ad alt. 3000 fere 



ped. convallium Rib. Frio et Rib. da Metade, cum C. lucido a et 



/3 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. ft), 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. lucidum, 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* 



