276 Occasional Papers Bernice P. Bishop Museum 
malleate. ‘The parietal plate is much narrower and less developed 
than in Catinella paropsis. 
Length 11.2, diameter 7.6 mm. 
Oahu: Mount Kaala (Thaanum). Type and paratype No. 
30915, Bishop Museum; paratypes, Thaanum collection. 
LAXISUCCINEA new genus 
The shells are succineiform, the last whorl distinctly and bluntly 
angulate below its periphery, flattened ventrally, and forming a platform at 
and below the inner margin of the aperture. The margin of the aperture 
is entirely free and is not appressed to the last whorl as in other Succineidae. 
Laxisuccinea is an interesting group of this rather conservative 
family. The separation of it from other Succineidae is based 
entirely on shell characters, but these characters appear to be of 
sufficient importance to necessitate the forming of a new genus. 
Unfortunately, the only two species which have been found are fos- 
sil. Both species are from the island of Kauai and were found in 
Pleistocene or Récent deposits near the sea, and each of the species 
was confined to a very limited locality. A search for living speci- 
mens was made in the vicinity, but none was found. 
meee te ae 
ype: Lasisuccinea libera new species. 
Laxisuccinea libera new species. Pl. XXV, 6. 
The shell is ovate, in its fossil state dull white with a slight yellowish 
tinge, irregularly marked with minute lines of growth. Whorls almost two; 
the first minute, very convex, and having a deep narrow suture; the last 
large, increasing very rapidly and occupying nearly the whole of the shell, 
bluntly but distinctly angled below the periphery and flattened ventrally just 
below this angle, its last fourth free, cornucopia-like. Aperture nearly 
ellipsoidal in outline, its margin free and erect, not attached either to the 
columellar or parietal wall. There is no indication of a parietal plate. 
Length, 7.8, diameter 5.5 mm. 
Kauai: in Pleistocene or Recent deposits in road cutting near 
the southern extremity of the Hanamaulu flat (C. S$. Dole and 
Cooke). 
Type No. 19539, Bishop Museum; paratype Academy of Nat- 
ural Sciences of Philadelphia. 
One whole specimen and five or six fragments are all the 
material I have been able to study, although to procure more mate- 
rial of this species two special trips were made to the identical spot 
[16] 
