126 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



PRELIMINARY DIAGXOSES OF NEW SRECIES OF NON-MARINE 

 MOLLUSCA FROM THE HAWAIIAN ISLANDS. PART I. 



By E. R. Stees, B.A., F.Z.S., etc. 



Read Vlth June, 1896. 



During the past few years Mr. R. C. L. Perkins has been collecting 

 natural-history specimens in the Hawaiian Islands, under the auspices 

 of a joint committee of the Royal Society and the British Association 

 for the Advancement of Science. Since Mr. Perkins may be still for 

 some time in the Islands, the final report on the Mollusca must be 

 delayed, and it therefore appears advisable to diagnose from time to 

 time the new species as they are found in the fresh material sent 

 home. It is hoped that the new forms will be fully illustrated in 

 the final report. 



1, Macrochlamys Perkinsi, n.sp. 



Testa imperforata, tenuis, cornea vel fusco-cornea, nitida, superne 

 sub lente indistincte striata ; spira depresso-conoidea, apice obtuso ; 

 anfr. 4^—5, regulariter et lente accrescentes, convexiusculi, ultimus 

 paulo supra medium subangulatus ; sutura subimpressa ; apertura 

 lunato-ovata, subobliqua ; perist. simplex, tenue, rectum. Diam. 

 max. 6'5, min. 6, alt. 3'5 mm. ; alt. apert. 2'5 mm. 



Hal. — Lanai (Perkins). 



The difficulty of giving a serviceable description of these forms is 

 very great, but perhaps M. Perkinsi may be best identified by its 

 colour, which is darker than usual, by the narrowness of the last 

 whorl, the slowness and regularity with which the whorls increase, 

 and the striation on the upper surface. 



2. Endodonta (Thaumatodon) eingens, n.sp. 



Testa parva, late et perspective umbilicata, regulariter ruguloso- 

 striata, corneo-flavescens, rufo maculata ; spira depressa, apice 

 mediocri, loevi ; anfr. 5-5-5-, tumidusculi, compressi, regulariter 

 accrescentes, ultimus ad peripheriam rotundatus, basi convexius- 

 culus ; apertura rotundo-lunaris, lamellis duabus conspicuis parietalibus, 

 supera majore ; dentibus quatuoribus in labio. Diam. max. 4*5, alt. 

 1'5 mm. 



Hob. — Mountains of Lanai, behind Koele (Perkins). 



This shell recalls in form JE. hystrix, Mighels, but in lamellae and 

 teeth strongly resembles E. rugaia, Pease. It may be separated 



