TORNATELLINA. 143 



imperforate Hawaiian Is. species, with fewer whorls. A 

 specimen in the collection of the A. N. S. P. measures, length 

 3.25, diam. 1.75, aperture 1.25 mm. The parietal lamella is 

 very low and about one-third of a whorl long. Reduction of 

 the parietal lamella to a greater or less extent is character- 

 istic of the species; it is always short in the adult, a little 

 larger and stronger in the neanic stage. The columella is 

 strongly twisted, thin; and the striation is distinct. Whorls 

 4%. A slightly larger specimen in the collection of the Bishop 

 Museum has 4% whorls and is 3.5 mm. in length. Ancey's 

 type specimen, B. P. Bishop Museum coll., no. 18422, is from 

 Manoa, Oahu. 



In an embryonic specimen the shell is imperforate. Under 

 a high-power lens the surface is minutely granulate. The 

 columella is almost straight, not swollen as in T. mcgregori 

 and there is no sign of the median columellar lamella. The 

 parietal lamella is very minute, much smaller than in T. b. 

 subrugosa or T. mcgregori. 



Most of the young, at about the metaneanic stage, have a short, 

 lower palatal fold. Some specimens (pi. 40, fig. 13, Kaelepulu) 

 have, in addition, a second palatal fold opposite the margin 

 of the parietal lamella. The columella at the metaneanic 

 stage is almost straight, twisted, and is furnished near the 

 middle with a rather strong almost transverse fold. The 

 parietal lamella is rather strong, scarcely bent in cross section, 

 and its margin is very slightly sinuous. The specimen fig- 

 ured in pi. 42, fig. 2, is 2.25 mm. in length and has 4 whorls. 



5a. T. b. subrugosa, n. var. PL 35, figs. 7, 10. 



A series of sheUs from Maui (no. 98050 A. N. S. P.) differs 

 from typical T. baldwini by having low, widely and unequally 

 spaced narrow folds or wrinkles in the direction of the growth 

 stride. The columella is strongly twisted much as in T. gra- 

 cilis. The parietal lamella is moderately high but very short, 

 1/4 to l /$ of a whorl long. The figured specimen measures 2.8 

 mm. long, 1.55 diam., length of aperture 1.3 mm. ; but an im- 

 perfect shell is much larger. It is an extremely fragile form. 

 An embryonic shell, taken out of the mouth of an old one, is 



