1901.] NATURAL SCIENCES OF PHILADELPHIA. 475 



placed upon the different form of the clausilium. Hemiphcedusa 

 now comprises various shell- forms, especially among Chinese 

 species, and will probably require to be more or less subdivided. 



As the figure of C. mikado Pi Is. was on too small a scale to 

 show the form of the spire well, I give here an enlarged outline, 

 PI. XXVII, fig. 35. 



Clausilia iotaptyx Pilsbry. PI. XXVII, fig. 38. 

 These Proceedings for 1900, p. 674. 



The reference to plate in my former paper should read PL 

 XXIV, not " PI. XXV." In the description, p. 675, eighth 

 line from top, the lunella was stated to be " lateral," whereas it 

 is, in fact, nearly ventral. The same correction should be made in 

 the third line from bottom of same page. 



The systematic position of this species was left in doubt in my 

 former paper; but further study inclines me to place a good deal 

 of weight upon the characters of the clausilium in deciding on the 

 classification of any Phsedusoid species; and this would throw 

 C. iotaptyx into my section Tyrannophcedusa. The definition of 

 that group must then be extended to include species with fewer 

 whorls, but having the same type of closing apparatus. As in C. 

 mikado, the upper half of the shell is attenuated. 



Clausilia iotaptyx, var. clava Pilsbry. PI. XXVII, figs. 36, 37. 

 Pilsbry, Nautilus, XIV, p. 108 (January, 1901). 



Much smaller than C. iotaptyx, but similar in form; whorls 

 llJj-12, the first globose, following 7 or 8 attenuated, last 3 swol- 

 len and forming more than half the length of the shell, the last 

 whorl tapering below, impressed at the position of the principal 

 plica, more or less distinctly ridged 'behind a wide shallow constric- 

 tion behind the lip. Finely striate where not eroded; whitish or 

 dirty buff, and lustreless. Aperture as in C. iotaptyx, but the 

 subcolumellar lamella is sometimes wholly immersed. Closing 

 apparatus more lateral than in iotaptyx, the upper palatal plica 

 strong but short, lower plica shorter, connected with a rudimen- 

 tary, straight lunella, which does not reach the upper palatal fold. 



Alt. 12, diam. 2.8 mm. 



Alt. 11.5, diam. 2.5 mm. 



Senzan, Awaji Island (Y. Hirase). Types No. 79,723 Coll. 

 A. N. S. P., from No. 292 of Mr. Hirase's collection. 



