GASTEROPODA. 119 
stma: apertura obovata, dimidiam teste longitudinis vix superans ; 
columella rufa, valde plicata. 
Physa reticulata, Goutp ; Proceed. Boston Soc. Nat. Hist., ii 214. 
June 1847. Expedition Shells, 43. 
SHELL rather large, thin, elongated, ovate-conic, of a brownish- 
yellow colour, somewhat shining, but roughened by crowded lines of 
growth, which are crossed, more especially in young specimens, by 
very minute revolving lines. Spire elevated; whorls five, of which 
one or two are often lost, quite ventricose, and separated by a very 
deep suture. Aperture rounded ovate, scarcely more than half the 
length of the shell. Columella reddish-brown, very strongly folded, 
and united to the outer lip by callus. 
Length seven-tenths of an inch; diameter three-tenths of an inch; 
but it varies much inits dimensions. Another specimen measured six- 
tenths by three-tenths of an inch ; another one-half by one-fourth of an 
inch. 
Inhabits the Sandwich Islands; common. 
Remarkable for its general colour, its coloured columella, its re- 
volving strize (which are not always seen on very old specimens), and 
its very tumid whorls, like a reversed Limnea elodes, Say. 
In the Voyage de la Bonite, pl. 29, we have Lymnée de Oahu, 
figs. 38-41, and L. (Physa) voisine, figs. 42-44; the latter appears to 
be the young of the former. The animals of both seem to be alike, 
but are so indefinitely delineated that it is impossible to say whether it 
be truly a Physa or a Limnea. In a region where shells seem to 
take a direction to the right or left so indifferently, it would not be sur- 
prising to find reversed shells common in the fresh water, as well as 
on the land; and if here is an instance, I should decide, from its 
general figure, that this were a Limnea rather than a Physa. 
Figure 140, an elongated specimen ; 140 a, a short specimen; 1404, 
the back of shell. 
