1917.1 



NATURAL SCIENCES OF PHILADELPHIA. 



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folds. There are deep spirals at both ends, about 10 above, columella 

 is slightly concave, widely reflected, bounded by a groove as usual, 

 and indistinctly truncate basally. White. It appears to be closely 

 related to A. debilis and A. cornuta, which have no longitudinal 

 plication. 



Length 5, diam. 2.3 mm. 



Fig. 9. — H. a. oahuensis. Fig. 10. — H. c. tomaculutn. 

 Haminea aperta oahuensis n. subsp. Fig. 9. 



Compared with H. aperta Pse. of Tahiti, this shell differs by being 

 more swollen in the middle, and malleate (like some Lymnseas) in 

 the peripheral region. It is white, and without engraved spirals. 



Length 14.5, diam. 10 mm. 



On the shore of Oahu, 1| miles east of Kahuku. Type No. 117072, 

 A. N. S. P., collected by Pilsbry, 1913. 



The type of H. aperta originally illustrated by Pease, No. 57575 

 A. N. S. P., has been compared. 



Haminea curta tomaculum n. subsp. Fig. 10. 



Resembling H. curta A. Ad., but narrower, strictly cylindrical; 

 narrowly perforate at both ends. Columella very narrow, hardly 

 reflected; sculpture of minute, unequal, close spiral striae, with about 

 30 distinctly deeper spirals, close towards the base, elsewhere rather 

 widely and unequally spaced. 



Length 12.4, diam. 5.5 mm. 



Off Honolulu, 6 to 8 fathoms. D. B. Kuhns, 1916. Type No. 

 117073 A. N. S. P., from No. 1181a Thaanum coll. The "original 

 figure of H. curta, as well as the specimens before me, is distinctly 

 shorter and wider than this Hawaiian form, with the sides more 

 convex and the lip ascending less at the posterior end. H. cuti- 

 cuUfera Smith and H. cairnsiana Melv. are related forms. 



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