226 PROCEEDINGS OF THE ACADEMY OF [1895. 



dingy white, superior portion sometimes flecked with gray. Ten- 

 tacles of darker shade. 



The dentition is the same as that of the arboreal Achatinellas 

 generally. A central tooth is present ; and the formula of dentition 

 is 125-1-125x120=30,120. (Prof. Gwatkin.) 



This species also belongs to the group of A. physa Newc. , but 

 is readily distinguished by its much smaller size, smoother surface, 

 delicate lip, and arrangement of colors. The habitats are also 

 widely separated and the animals different. 



Achatinella Tlieodorei, n. sp. PI. X, fig. 27. 



Shell sinistral, subperforate, rather thin, elongately conical, apex 

 subacute ; surface shining, sculptured with somewhat irregular 

 incremental stride, and under a lens exhibiting extremely close and 

 minute decussating spiral stria) ; nuclear whorls smooth. Color 

 dingy white, striped and mottled irregularly with longitudinal dark 

 brown streaks. Whorls 7, lightly marginate above, slightly convex; 

 suture moderately impressed. Aperture oblique, oval, purplish 

 brown within ; peristome acute, margined with brown, very lightly 

 thickened within, columellar margin slightly reflexed ; columella 

 terminating in a slight, flexuous, brown fold. 



Length, 18 J ; diam. 9 mm. 



Habitat, Kawela, Island of Molokai. 



The animal has not as yet been observed. The shell belongs to 

 the group of small elongately conical Partulina for which Mr. Har- 

 per Pease proposed the name Perdicella as a subgeneric title. 



The nearest allied species is A. ornata Newc, which is of 

 much smaller size, more delicate markings, has a peripheral dark 

 band, and inhabits a different island. 



Seotion NEWCOMBIA Pfeiffer. 



Achatinella canalioulata, n. sp. PI. X, figs. 28 29. 



Shell sinistral, very minutely perforated, somewhat solid, acu- 

 minately turreted, apex subacute; surface sculptured throughout 

 with numerous acute, spiral keels, which become blunter as they 

 approach the apex, the interstices between the keels exhibiting 

 under a lens very delicate growth stria;. Color brown, upper 

 whorls tessellated with brown and white. Whorls 6, slightly con- 

 vex, lower one somewhat flattened at the base ; suture lightly 

 impressed. Aperture oblique, oval, iivid white or light brown 



