274 Occasional Papers BcniiccP. Bishop Museum 



The shells arc pale chalcedonj'-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 F'ease 



Pease proposed this generic title in the Journal de ConchyH- 

 ologie (xviii. 1870). page 89. for Succinea explanata Gould and 

 Snccinea pittajiicn Gould. On page 97 of the same work, he 

 includes CatincUa nibida, a new species, in the same genus with 

 C. explanata. In the Proceedings of the Zoological 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 Hawaiian species formerly included in the genus 

 Succinea lead me to believe that Catinella should be restored to 

 generic rank. LTnfortunately 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 dift'er as to habits, as some 

 are arboreal and others are terrestrial. 



Catinella rubida Pease. Plate XXV, i. 



.Vt 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 lengtli and y.?, mm. in diameter and is made up of 

 nearly i^/j whorls; it is buckthorn-brown in color. 



I 14] 



