Dr. J. E. Gray un two neiv genera of LMnd MoUusca. 413 



he was able to procure sound shells. He tried it several times, and 

 destroyed some hundreds of shells before resorting to the latter 

 means. 



I may observe, that the animal in spirits does not give one 

 the impression of being so large, compared with the shell, as 

 the above description would imply ; but, like the Succiiiece, Vitrince 

 and other genera, these animals appear to have the faculty of 

 absorbing a quantity of moisture and of inflating their bodies 

 and making them appear of a large size, and when suddenly 

 killed they have not the power of lessening it, but while alive 

 they certainly have. During dry and perhaps cold weather they 

 expel the air and water, and so contract their bodies, that they 

 can be withdrawn a considerable distance within the cavity of 

 the shell. I have often seen this ceconomy in the amber snails, 

 Succinece, and the shield shells, Vitrina, and Professor Xilsson 

 has observed the same fact with regard to the latter genuii, as 

 quoted by me (Gray, Turton Man. 119). 



The type of the genus is Pfeifferia micans. 



Helix micans, Pfeiffer, Proc. Zool. Soc. 1845, 71 ; Monogr. 



Helic. ii. 24. 

 Corasia micans. Alters, Heliceen, 111. 



Nanina Albaiensis, Gray, Ann. ^" Mag. N. H. 1853, p. 331, teeth. 

 Hab. Lu9on. 



Mr. Cuming observed it in the greatest abundance on the 

 leaves of bushes at St. Jauno, in the province of Cagayan, at the 

 extreme north part of the island of Lu9on. 



Dr. Albers refers the species to his subgenus Corasia, consist- 

 ing of Helices with large reflected peristomes ; the shells have 

 some resemblance to the young imperfect specimens of some 

 species of that genus, as Helix Albaiensis, but they differ from 

 them in the pillar lip being evenly arched and imperforate, and 

 not straight from the axis and slightly perforated, as in their 

 young shells it always is, 



MM. Quoy and Gaimard described a land moUusk which 

 they discovered on leaves in Tasman's Bay, New Zealand, under 

 the name of Limax bitentaculatus, Voy. Astrolabe, 1. 13. f. 1, 2, 3. 

 They only found a single specimen, which, they say, they 

 only partially examined. From this description, as the animal 

 differed from Limax in so many particulars that it was impos- 

 sible to keep it in that genus, I formed a temporary genus for 

 it under the name of Janella, in the 4th volume of Mi-s. Gray^s 

 ' Figures of MoUusca,' p. 112. I have just received from New 

 Zealand a specimen of land moUusk which agrees with the ani- 

 mal described by MM. Quoy and Gaimard in so many parti- 



