114 PATULA-ANGUISPIRA. 



ing, basal well rounded, columellar slightly thickened and a trifle 

 reflexed. (Bttg.) 



Alt. 2 f-3, diam. 5^-6 mill. ; apert., alt. If, width 2 mill. 



Papero, Island of Saparua. 



Macrocycloides saparuana BTTG., Ber. Senck. Naturforsch. Ges. 

 1891, p. 260, t. 3, f. 8a-b. 



The umbilicus is wider than in microcyclis Bttg., the entire con- 

 tour flatter, lens-shaped, the periphery angular, mouth smaller with 

 less steep and rectilinear upper margin. 



P. SERICINA Boettger. PI. 42, figs. 34, 35. 



Shell small, perspectively umbilicated, the umbilicus f-s the 

 width of the shell, depressed-convex, thin, whitish, satiny ; spire 

 convex, apex little prominent. Whorls 4-41, slowly increasing, 

 convex, separated by a profound suture ; ribbed with very close 

 hair-like stride, and in the interstices microscopically spirally lineo- 

 late ; last whorl much flattened above, rounded at the periphery, 

 the base more convex, subcylindrical ; slightly widening toward the 

 aperture, not descending. Aperture moderate, rather oblique, 

 truncate-piriform ; peristome simple, rather acute, the margins dis- 

 tant, joined by a callus ; the upper margin straightened, obliquely 

 descending, columellar margin not thickened, and but a trifle 

 reflexed. (Bttg.) 



Alt. lf-2, diam. 3-3J mill.; apert., alt. H, width If mill. 



Oma, Island of Haruku. 



Macrocycloides sericina BTTG., Ber. Senck. Naturf. Ges. 1891, p. 

 261, t. 3, f. 9, 9a-b. 



It is easy to separate this from the relatives of M. microcyclis Bttg. 

 by its white color, dull satin luster, the close rib-striation, and small 

 size. It is interesting to find that the three principal islands of the 

 Amboyna group has each a well-defined species of Macrocycloides! 



ACANTHINULA (Vol. Ill, p. 53.) 



A. PERACANTHODA Bgt. (H. Rciffrayi Bgt, olim.) 



Cockerell has proposed to substitute the name raffrayana for 

 raffrayi (Journal of Conchology, Leeds, 1888, p. 261) but Bourgui- 

 gnat's name peracanthoda has priority. 



Section ANGUISPIRA Morse (Vol. Ill, p. 55.) 



This group of Patula is confined to the temperate portions of 

 North America. It consists of rather large species, all of which are 



