AMPULLARIA efFiisa, 

 Ribboji Apple Snail. — Middkjigum. 



Generic Characteu. — See Pi, 103. 



Specific Character. 

 A. testa globosd, lcevi,fasciis picrpureo-fuscis cinctd; spird depressi, 



apice prominente ; aperturd a/igustd ; umbilico magno, profunda ; 



columella ohsoletd. 

 Shell globose, smooth, with purple brown bands ; spire depressed, 



the tip prominent; aperture narrow; umbilicus large, deep; 



pillar obsolete. 



Helix glauca. Linn. Dillw. 918. Helix ampullucea, {var. y) Gmelin, 

 3626. Bulimus effusus. Brug. p. 296. No. 1 . 



Lister, 129. 29. Seba, tab. 38. /. 39. tab. 40. /. 3. 4. 5. (optime.) 

 Martini, 9. tab. 129. f. 1144-5. Knorr, 4. tab. 5./. 3. 



I CONCUR with Mr. Dillvvyn in believing that this shell is 

 the Helix glauca of Linnaeus ; but, as it is now removed to 

 another genus, I think no real advantage would result from, 

 continuing its original specific name ; particularly as the 

 identity may be questioned by others, without a chance of 

 the question ever being settled : the adoption of the specific 

 names given to species slightly or incorrectly described by 

 the older naturalists, inevitably tends to increase the original 

 obscurity, in all cases where the point cannot be cleared up. 

 A. effusa may be distinguished from all others by the colu- 

 mella being nearly obsolete ; this part existing only in the 

 two terminal whorls of the spire. This species therefore 

 forms a transition to the Planorhes: there is a variety, with 

 narrower stripes, double the size of that here figured. 



AMPULLARIA luteostoma. 

 Yellow-mouthed Apple Snail. 



A. testd globosd, striatd, olivaced, lineis remotis fuscis fasciatd ; spird 

 levatd, apice acuto ; aperturd effusd intus marginatd ; umbilico 

 magno. 



Shell globose, striated, olive, with remote transverse brown lines, 

 spire elevated, the tip acute ; aperture wide, within margined ; 

 umbilicus large. 



The umbihcus of this shell is not so deep as the last, but 

 is larger than in any other known species ; the columella is 

 likewise perfect, and the aperture is wider and more oblique 

 than in A. effusa. 

 PI. 157. 



