PATULA-MACROCYCLOIDES. 



Section MACROCYCLOIDES Martens (Vol. Ill, j>. 48.) 



P. MICROCYCLIS Boettger. PL 42, fig. 33. 



Shell small, perspectively umbilicated, the umbilicus over two- 

 sevenths the diameter of the shell, depressed-convex, rather solid, 

 corneous-yellow, oily-shining ; spire conoid-convex, apex obtuse, 

 slightly projecting. Whorls 4J, slowly increasing, little convex, 

 separated by an impressed suture, ornamented with sigmoid 

 impressed lines here and there deeper, and closer at suture and 

 umbilicus ; last whorl flattened above, at' the periphery rounded- 

 subangulate, the base convex, slightly enlarged toward the aperture, 

 not descending. Aperture moderately oblique, truncate-piriform ; 

 peristome obtuse, margins distant, joined by a callus, the upper mar- 

 gin straightened, obliquely descending, subretracted at the suture, 

 then lightly subangularly protracted, simple ; columellar margin 

 slightly thickened and a little reflexed. (BttgS) 



Alt. 3-3, diam. 5-6 mill.; apert., alt. 11-11, width 2i-2f mill. 



Hitulama, North Amboyna; Ema and Kusukusu (SereJi), South 

 Amboyna. 



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

 260, t. 3, f. 7, 7a. 



Keadily distinguished from known species of Macrocycloides by 

 the small size and lack of spiral striation. The upper surface 

 reminds one somewhat of Hyalinia (PolitaJ) petronella Charp., and 

 the umbilicus and aperture strongly resemble those of Macrocyclis 

 [Selenites] concava Say. 



P. SAPARUANA Boettger. PL 42, figs. 31, 32. 



Shell small, broadly umbilicated, the umbilicus one-third the 

 width of the shell, convex-depressed, thin, corneous-brownish, uni- 

 colo red, oily-shining ; spire very little elevated, slightly convex, 

 apex obtuse, slightly prominent, whorls 4?, slowly increasing, a little 

 convex, separated by impressed sutures ; ornamented with sigmoid 

 impressed lines, here and there deeper, and closer at suture and 

 umbilicus ; last whorl flattened above, the periphery very distinctly 

 angulated, convex below ; before the aperture not descending. 

 Aperture small, moderately oblique, subcircular, angled above and 

 at the right side ; peristome slightly obtuse, the margins subdistant, 

 joined by a callus ; upper margin little curved, obliquely descend- 



