274 Occasional Papers Bernice P. Bishop Museum 
The shells are pale chalcedony-yellow on the outside, whitish within; 
the growth-striae are very faintly marked. The parietal margin is furnished 
with a long thin plate which is separated from the upper outer margin of 
the aperture by a rather deep sinus. The aperture occupies nearly the whole 
of the shell. The figured specimen (Bishop Mus. No. 58474) measures 
8.4 mm. in length, 6.8 mm. in diameter. 
CATINELLA Pease 
Pease proposed this generic title in the Journal de Conchyli- 
ologie (xviii, 1870), page 89, for Succinea explanata Gould and 
—Succinea putamen Gould. On page 97 of the same work, he 
includes Catinella rubida, a new species, in the same genus with 
C. explanata. In the Proceedings of the Zodlogical Society of Lon- 
don (1871, page 459), he gives a generic description and selects 
Catinella rubida as the type of the genus. 
Later authors have reduced Catinella as an absolute synonym 
or at the most have retained the name as a section or subgenus of 
the genus Succinea. 
Anatomical studies of the animals of Catinella rubida and a 
number of other Hawatian species formerly included in the genus 
Succinea lead me to beli¢ve that Catinella should be restored to 
generic rank. Unfortunately the number of species so far dissected 
has not been very large, but the additional material that will be 
available in 1922 will enable me to complete the work during that 
year. Most of the species formerly referred to Succinea, from 
Kauai, Oahu, and Molokai and some of those from Maui, in the 
form and arrangement of their genital organs resemble very closely 
C. rubida. Species referable to this genus differ considerably in the 
form and size of their shells. They also differ as to habits, as some 
are arboreal and others are terrestrial. 
Catinella rubida Pease. Plate XXV, 1. 
At an elevation of about 2000 feet, just below the swamp at 
Wahiawa, Kauai, I collected typical specimens of this species. 
Descriptions of the animals of this and other species from the 
Territory of Hawaii will be deferred until the anatomy of more of 
these species has been completed. The figured specimen measures 
10.6 mm. in length and 7.8 mm. in diameter and is made up of 
nearly 1% whorls; it is buckthorn-brown in color. 
[14] 
