1905.] NATURAL SCIENCES OF PHILADELPHIA. 785 



columellar lamella, three basal plicae and one palatal plica, all of which 

 are much weaker than in E. lamellosa (Fer.). 



Alt. 2.75, diam. 6 mm. 



Locahty: Wailau Pali, Mapulehu, Molokai. The types are in the 

 collection of the Academy of Natural Sciences, No. 90,140, presented by 

 Mr. D. Thaanum. 



This species has a proportionately larger umbilicus than E. lamellosa 

 (Fer.) or concentrata P. and V., and the teeth are much smaller than 

 in either. The umbilicus resembles that of E. lamellosa. It is utilized 

 as a receptacle for the eggs. 



Endodonta concentrata n. sp. PI. XLIII, figs. 5, 6. 



Shell lenticular; nearly smooth; marked with weak growth-lines 

 only; oliveaceous yellow becoming brown near the lip where the epi- 

 dermis is preserved, but usually in large part denuded of cuticle, gray- 

 ish, with irregular angular brown spots on the upper surface of the 

 last whorl, and often some marking on the base; spire convex, com- 

 posed of 5+ nearly flat whorls, separated by a linear suture. The last 

 half whorl a little descending, the preceding keel a little overhanging, 

 periphery sharply keeled ; base convex ; umbilicus about one-fifth the 

 diameter of the shell, well-shaped, a little contracted and rounded at 

 the edge, being perceptibly more ample within. Aperture trapezoidal, 

 obstructed by two parietal lamelte, the outer being the larger and 

 bifid; one columellar lamella; three basal plicae and one palatal plica. 

 Alt. 2.75; diam. 5 mm. 



Locality: Lanai. The types are in the collection of the Academy 

 of Natural Sciences of Philadelphia, No. 89,241, presented by Mr. D. 

 Thaanum. This Endodonta is smaller than E. lamellosa (Fer.) and 

 marsupialis P. and V. It has the opening of the umbilicus contracted as 

 in marsupialis but to a less degree, and neither sharp-edged nor pro- 

 vided with a spiral cord. As in E. marsupialis, the eggs are carried in 

 the umbilicus. The apertural laminae are well developed, much larger 

 than in E. kamehameha P. and V. 



Opeas opella n. sp. Fig. l. 



Shell cream colored, glossy, indistinctly irregularly striate, rather 

 stout, apex obtuse, whorls six moderately convex, body whorl high, 

 umbilicus very small, aperture ovate more than one-third the height 

 of the shell, outer lip evenly arched, columella sinuous and reflexed 

 over the umbilical perforation. 



Alt. 6.8, diam. 2.9 mm. 



Locality: Honolulu. This species is a little larger and more 

 51 



