REVIEWS. 547 
slightly elevated ; below convex; umbilicus large ; suture 
impressed ; whorls four; lip sharp; color light brown. 
‘irst discovered in Cincinnati, Ohio, and Fig. 45. 
since found in various places throughout | C 
New Engkind. This species is not uncom- K) 
mon, though owing to its extreme minuteness is not often 
found. The writer has separated this into a distinct 
genus, from the fact that the jaw is composed of sixteen 
distinct pieces, and not one solid plate, as in other snails. 
For reasons already given, the species are described un- 
der their old generic names. — To be continued. 
REVIEWS. 
tig 
ENUMERATION OF et Prants. By Horace Mann. (From the 
ro SP of the American Academy of Arts and Sciences, Vol. 
VII., 1866.) Gambit, July, 1867. 8vo. pp. 92. 
The collection which forms the basis of this enumeration was made 
during a visit of over a year to the Hawaiian Islands. The enumera- 
tion, consisting of a list of the entire know of land-plants, with 
descriptions of new genera and species, is i piekabi by a sketch of 
previous botanical RN in these islands, with a description of 
Er physical geography of the five islands visited by the author, and 
marks on the a of the plants, which latter depends on the 
ie tition of heat and moisture, and vation of the soil. The 
wet region of Hawaii, for example, extending on the eastern side of the 
island, from a height of 1,500 or 2,000 feet, to about 5,000 feet,* is the 
most heavily wooded of the group. The parts between 1,500 feet and 
*" The bs yng of st Mani. Oahu, and Kauai, lying between the heights of 4,000 and 
6.500 feet, re just in tie, foid level. and, being a also > peaks yiee Eae T r long been 
active, le soil has become scovewh at ii im alge s to camiea te: which th erate p 
~ svg surface, The region has a pee aspec which Ba : one e$ recognized 1 iy aee seen mug 
m a à rosideros Im 
ountains. The onis forest ae ihe vt ets bs yide bpaticæ, w which piapa 
emains on 
saaa Hi trunks are ĉovered with a : i arn AS tak & 
moi SO as render everything dripping wet; and 1 os 
of flower ride, plants and ferns oeeur in tine whole: Above this, on He m eenaa of West 
Mam and Kaun thet is an open tract, where the lebia, one of the lar; dosed fo Pea onan 
ag pen 
at an elevai p) * » : me two satiny in spre 
evation of 2,000 feet, has emma a arfed, a foo! aS tuned ths le iar te 
but still flo bi t f su ci clum 
these — a nd inthe neighboring tuss piit eks nf sedge (a an n Oreobolus) are founa “the few 
other Plas a. high nicer kere sak aawnere cae, to the number OF Cane E r nine; also 
Droser a longifolia ge peal ES of miles from its next nearest known 
