Cooke — Hazcaiian Zonitidac and Siicciiieidae 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 Loxisitcciiica liaciia is its most distinctive 

 characteristic. 



Laxisuccinea haena new species. PI. XXA'. 5. 



The shell is broadly ovate, in its fossil state white, irregularly and 

 unevenly minutely striate with lines of growth. Whorls 2^4, the upper i>4 

 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 Plaena 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, CatineUa rotnndata Gould, from Oahu. It is. however, 

 much more closely related to Laxisuccinea 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. 



[17] 



