27 



anfractibus quinque, laevigatis, subplanulatis, spiraliter tenuissime 

 striatis, pallescentibus, minutissimfe albido-fuscoque articulatim 

 pictis ; apertura subquadrata ; unibilico magno, profundo : 

 long. O-2.5, lat. 0-35. Conch. lUustr. f. 8. 

 Hab: 

 Obs. This appears to be an osculeni species, connecting Margarita 

 with Solarium. 



MiSCKLLANEOUS OBSIrUiVATIONS, 



Some time since I was surprised at learning the fact that the toot of 

 C^yclostoma elegans is longitudinally divided by a desp groove, which had 

 lately been observed by my friend Lewis of KeriSin2:ton, though it had 

 been overlooked by Berkeley, but having accidentally met with the work 

 of Rossmaesler I find the circumstance is distinctly noticed, and several 

 representations given. But there is another fact relative to a well known 

 land shell (the Helix epistylium) first pointed out to me by the same 

 Gentleman, which I believe has not yet been noticed in any publication. 

 It is that this species is viviparous and its young are fully developed be- 

 fore they quit the parent, in the same manner as the young of Paludina 

 achatina. It has long been well known that many of the pneumono- 

 branchous Mollusca lay eggs, which are covered with a calcareous crust 

 in the same manner as the egg of Birds, but I have only met with two 

 species to which the term viviparous may justly be applied. This Helix 

 epistylium is one instance, and the other is a small turrited species of 

 Achatina, which I have named Jlchatina vivipara from this circum- 

 stance. Three or four fully developed young shells may generally be 

 found, upon breaking up a full grown shell, occupying commonly a 

 great portion of the second, third and fourth volutions from the base. 

 The shell is commonly about an inch long, consisting of about nine 

 volutions, the apex being blunt and rounded, the volutions longitudinally 

 striated and the base smooth ; the whole nearly white, semitransparent 

 and covered with a thin olivaceous horny epidermis : the young ones 

 consist of three volutions bipfore they quit the parent. 



