270 RIMULA. 



The figures of the type species, a fossil, show clearly that the 

 recent forms are correctly referred to this group. These figures are 

 copied (printed from the same plates?) in Blainville's Manuel. 



The shell is, in effect, an Emarginula in which the slit has be- 

 come closed, making a hole, situated half-way up the front slope. 

 There is a slit-fasciole extending upward from the hole as in Emar- 

 ginula. This group is modified from Emarginula in the same way 

 Schismope is from Scissurella. It forms a step in the progress of 

 Emarginula toward Puncturella. There is, of course, no internal 

 septum or " deck." 



Most authors have considered Rimula a genus but the shells do 

 not exhibit as much differentiation from Emarginula as Subemarg- 

 iuula and other groups which I have considered of generic value. 

 Semperia of Crosse forms a connecting link between Rimula and 

 Emarginula. 



Indo-Pacifie species. 



E. exquisita A. Adams. PL 64, figs. 3, 4. 



Large, oval, semipellucid, white, cancellated with radiating ribs 

 and elevated concentric lines ; cancelli subquadrate ; ribs cren- 

 ulated, unequal, prominent; anterior two diverging; interstices 

 having two riblets ; above the perforation concave; perforation 

 elongate, subquadrate. (A d.) 



Catanuau, Id. of Luzon, and Id. of Burias, Philippines ; on dead 

 shells in 7-10 fins. 



R. exquisita Ad. P. Z. S. 1851, p. 226, no. 1. — Ad. in Thes. iii, p. 

 210, f. 3, 4. 



E. carixata A. Adams. PI. 63, fig. 8. 



Small, oval, ornamented with very many simple, close, radiating 

 riblets; interstices cancellated, cancelli punctiform ; two anterior 

 riblets converging in front and united at the margin of the aperture ; 

 interstices above the perforation convex, extending over the summit, 

 falsely carinated ; perforation oval, narrow, narrowed in front, (Ad.) 



Cagai/un, province of Misamis, Mindanao, Philippines; on dead 

 shells, 25 fms; 



R. carinata Ad. P. Z. S. 1851, p. 226, no. 3.— Ad. in Thes., p. 

 210, f. 5. 



