1900.] NATURAL SCIENCES OF PHILADELPHIA. 675 



a little emarginate above. Sinulus high. Superior lamella rather 

 small, oblique, contiguous to the spiral lamella. Inferior lamella 

 deeply placed, but continued and emerging upon the peristome, 

 straightened within and giving off a branch toward the spiral 

 lamella. Subcolumellar lamella emerging, and with the inferior 

 lamella, continued to the margin. Principal plica strong and 

 long, nearly reaching the lip, and extending inward well beyond 

 the lateral lunella. Palatal plicae two, short, the upper parallel 

 with the principal plica, the lower one oblique, a straight lunella 

 connecting them, inserted near the middle of each, and with the 

 plicse forming an I-like figure. Clausilium (PL XXV, fig. 40), 

 trapezoidal -oblong, not much curved, somewhat thickened at the 

 sides, and especially thick on the columellar side near the apex, 

 strongly emarginate posteriorly on the columellar side. It is 

 shaped very much like that of C. mikado. 



Alt. 18, diam. 3.8, longest axis of aperture 3.6 mm. 



Alt. 16.3, diam. 3.3 mm. 



Ibuki, Omi (Mr. Y. Hirase). 



A solid, opaque species, with peculiarly thick though attenuated 

 spire. The clausilium seems far too thick at the end for a Heini- 

 phcedusa, though it is more elongate than usual in Euphcedusa, 

 being a good deal like that of C. mikado : and as in that species 

 the superior and inferior lamelke are very widely separated, even 

 within. Viewed from the back, in a specimen broken open, the 

 inferior lamella is but very weakly spiral, much as in many 

 flemiphsedusas, and is thickened below. The spiral and sub- 

 columellar lamellae both enter very deeply and equally, while in 

 Euphcedusa the spiral lamella should extend inward beyond the 

 other, according to Dr. Boettger, confirmed by the species I have 

 examined. This point is not very reliable perhaps, for in two 

 specimens of C. mikado opened, one has the spiral lamella dis- 

 tinctly longer, the other has the inferior a little longer. I fear, 

 therefore, that the sectional position of this species must be left in 

 uncertainty. I place it in Boettger' s Formenkreis von C. jos, of 

 Euphcedusa, but probably it belongs elsewhere. 



Compared with the Hemiphcedusa species, C. iotaptyx is nearest 

 to C. aurantiaca; but the closing apparatus is lateral, the superior 

 lamella is very low inside (while in C. aurantiaca it is high), and 

 the spire is thick and clumsy above. The lunella and associated 



