EMARGINULA. 261 



it is also less expanded posteriorly than either puncticulata or 

 crassa. (Soivb.) 



Habitat unknown. 

 E. tenuicostata Sowb. Thes., p. 215, f. 17, 18. 



E. scutellata Deshayes. PI. 41, figs. 14, 15. 



Shell ovate, depressed, snbsyinmetrical, apex snbcentral, recurved ; 

 ornamented with numerous radiating riblets, of which seven are 

 larger ; median rib in front with elevated edges, and numerous 

 equidistant scales. Marginal slit short, narrow ; margin irregularly 

 crenulated ; inside concave, whitish ashen. 



Length 20, width 15, alt. 7 mill. (Dh.) 



Island of Reunion: 



E. scutellata Dh. Catal. Moll, de File de la Reunion, p. 45, t. 7, 

 f. 1, 2. — ? E. planutarum Dufo, Ann. Sci. Nat. (2), xiv, p. 205, 

 1840. — Martens in Mobius' Reis. n. Maurit. p. 298. 



The form is like Subemarg inula, but the distinct slit-fasciole places 

 the species in Emarginula proper. 



E. costulata Deshayes. PL 41, figs. 12, 13. 



Shell small, convex, ovate-oblong, apex excentric, acuminate, 

 much inclined backward ; regularly costellate, riblets narrow, the 

 larger ones irregularly and very densely granulose ; transverse lirse 

 unequally cancellated ; margin obtuse, regularly crenulated ; an- 

 terior fissure narrow, deep. Length 7, width 5, alt. 3 mill. (Dh.) 



Island of Reunion. 



E. costulata Dh. Moll. Reun., p. 47, t. 7, f. 3-5. 



The slit is about one-fifth the length of the shell. The edge of the 

 shell is quite thick. Color a uniform grayish-white inside and out. 



E. decorata Deshayes. PI. 41, figs. 16, 17. 



Shell small, white, limpet-shaped, very unequally convex, longitu- 

 dinally ribbed, riblets narrow, interstices with erect lamellae; 

 summit excentric, much inclined backward ; slit short, narrow ; 

 margin thin, regularly dentate. 



Length 6, width 4, alt. 2 mill. (Dh.) 



Island of Reunion. 



E. decorata Dh. Moll. Reunion, p. 47, t. 7, f. 6-8. 



The apex is situated at the posterior fifth of the length ; fissure 

 one-eighth the length of the shell. 



