268 TORNATELLARIA. 



(the lower one larger, the first sometimes obsolete). Peris- 

 tome simple, acute, dilated and expanded at the columella. 

 Length scarcely 4.0, diam. 2.5, alt. apert. 1.75 mm. (Ancey). 



E. Maui: Kaupakalua (Baldwin), Kula, Kailua (Cooke). 

 Cotypes no. 18421 Bishop Museum and 111850 A. N. S. P. 

 Type not isolated by Ancey. 



Tornatellina abbreviata ANCEY, Journ. de Conchyl. li, 1903, 

 p. 298, pi. 12, figs. 7, 8. 



T. abbreviata, which belongs to the group of T. umbilicata, 

 Anc., of the western part of Maui, is more swollen than the 

 latter, and the parietal lamella, while robust, is less developed. 

 It is quite a large perforate species, with the conic spire com- 

 posed of 61/2 nearly flat whorls separated by a shallow suture. 

 The last whorl is swollen, well rounded, and not angular ex- 

 cept in the young stage. The two columellar folds are small 

 but distinct at this stage. In the adult they are less de- 

 veloped, and the upper one, which is perhaps a little less 

 salient, tends to become effaced. The little circular perfora- 

 tion is covered above by the narrow expansion of the colu- 

 mellar margin (Ancey). 



Recognition marks of this species are the obese shape and 

 strong parietal lamella, which tapers in front and is not 

 noticeably irregular or eroded there. Both columellar la- 

 mellag are moderately developed in the neanic stage, the lower 

 one being stronger, but in the adult only the lower persists, 

 the other being visible as an obtuse convexity, visible in an 

 oblique view in the aperture. A cotype from the Ancey col- 

 lection is figured on pi. 55, fig. 13. It measures, length 3.7, 

 diam. 2.5, length of aperture 1.75 mm., agreeing closely with 

 Mr. Ancey 's type measurements. Kaupakalua, East Maui. 



The specimen figured in pi. 55, fig. 12, is larger than any 

 in Ancey 's material. It came out of the original lot from 

 Mr. Baldwin, from which Ancey 's material was taken. It 

 has 714 whorls and measures length 4.6, diam. 2.95, axis of 

 apert. 2.1 mm. Height of parietal lamella 0.32 mm. In adult 

 specimens the umbilicus is one-sixth to one-ninth of the dia- 

 meter. There are about 14 very fine spiral stride on the em- 

 bryonic whorls. 



