104 THE NAUTILUS. 



Genus 2. Lucapina Gray, 1857. 



6. L. crenulata Sowb. ]Monterey to San Diego, Cal. 



The largest and moi?t beautiful of the American Fissurellidce. 



7. L. adspersa Phil. Key West, Florida. 



(Fissiirellldea fasciata Pfr. of authors.) 



8. L. eancellata Sowb. Tortugas. 



The edges of the hole are bluish-black. 



Genus 3. ^NIegatebenxus Pilsbry, 1890. 



9. 31. bimaculahis Dall. IMouterey, Bauliuas Bay, Purissima and 



Lobitas, Cal. 

 ( Clypidella himaculafa of collectors.) 



Genus 4. Lucapinella Pilsbry, 1890. 



10. L. callomarginata Cpr. Lobitas and San Diego, Cal. 



11. L. Umatilla Reeve. Key West, Florida. 



Subfamily III. Emarginulince. 



A. Apex absorbed by the hole, which is bounded inside by a pos- 



teriorly-truncated callus, Fissuridea, 



B. Apex absorbed or remaining ; anal fissure either a hole or a 



slit in the front margin ; no hole-callus, but having a more 



or less developed septum back of the hole or slit. 



a. A perforation at apex or on front slope, Pundurella. 



C. No internal hole-callus or septum ; apex not absorbed. 



a. Having a distinct slit in front, and a slit-band extending 

 from it to apex, Eviarginula. 



b. Having a hole on the front slope, Riniula. 



c. Slit short ; no slit-fasciole, Suhemarginula. 



Genus 5. Fissuridea Swains, 1840. 



This name was proposed for a highly arched species from the 

 Philippine Is. It has hitherto been regarded as a subgenus of Fis- 

 surella. Its synonymy is as follows : 



Fissuridea Swains., Malacol., p. 356, 1840, type F. galeata Helbl. 



Glyphis Carpenter, P. Z. S. 1856, p. 228, type G. aspera Esch. 



Not Glyphis Agassiz, 1843, nor of Gibbes, 1848, a genus of fishes. 



