Cooke—Hawatian Zonitidae and Succineidae 277 
where the first fragments were found. It is entirely unlike any 
other species of the family to which I have been able to refer, the 
free aperture seen also in Lavisuccinea haena is its most distinctive 
characteristic. 
Laxisuccinea haena new species. - Pl. XXV, 5. 
The shell is broadly ovate, in its fossil state white, irregularly and 
unevenly minutely striate with lines of growth. Whorls 2%, the upper 1% 
very convex with a deep suture, the last very large, occupying almost the 
whole shell, convex above, distinctly angled below the periphery and flat- 
tened ventrally just below the angle. Aperture oval, partly appressed to 
the parietal wall, but with its margin entirely free. There is no indication 
of a parietal plate. 
Length 8.9, diameter 6.4 mm. 
Kauai: in Pleistocene or Recent deposits in road cutting near ~ 
the western extremity of the Haena Plain (Cooke). Type No. 
58476 Bishop Museum, paratypes 37577 Bishop Museum, and also 
in Academy of Natural Sciences of Philadelphia. 
Though less circular in outline, this species resembles, at first 
glance, Catinella rotundata Gould, from Oahu. It is, however, 
much more closely related to Lavisuccimea libera described above. 
Though the margin of the aperture is entirely free from the rest of 
the shell, its inner upper portion is partly appressed to the parietal 
wall. Evidently L. haena has not diverged so far from the parental 
Succinea-type as L. libera has done. 
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