52 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



2826 to 2828 in 94 to 10 fathoms, off La Paz, Gulf of California. The 

 type has 9 postnuclear whorls and measures: Length, 2.8 mm.; diam- 

 eter, 1.1 mm. 



RISSOINA ZELTNERI DeFoIin. 



Plate 31, fig. 3. 

 Rissoina zcltncri DeFolin, Les Meleagrinicoles, p. 47, 1867, pi. 5, fig. 1. 



Shell elongate-conic, white, shining. Nuclear whorls smooth, well 

 rounded, forming a helicoid spire. Postnuclear whorls marked by 

 feebly developed, decidedly protractive, closely spaced, rounded axial 

 ribs, of which DeFolin figures about 26 on the sixth, 28 on the sev- 

 enth, 30 on the eighth, and 42 on the penultimate turn. Intercostal 

 spaces very feebly impressed, smooth. Suture well marked. Base 

 moderately long, slightly concaved anteriorl}'', crossed by the contin- 

 uations of the axial ribs which extend to the umbilical chink and 

 about 14 equal and equally spaced, spiral lirations which pass over 

 the intercostal spaces and ribs. Aperture rather large, channeled 

 anteriorly and posteriorly; outer lip effuse, reinforced immediately 

 behind the edge by a strong varix; inner lip sinuous, thick and 

 appressed to the base. 



DeFolin's figure shows a shell of 10 whorls which measures: Length, 

 4.5 mm.; diameter, 1.8 mm. It comes either from Panama or 

 Negritos Island (probably Negros, Philippine Islands). I have 

 not seen this specimen. 



RISSOINA LAURAE De Folin. 



Plate 31, fig. 7. 



Rissoina lanrae De Folin, Fends de la Mer, vol. 1 , 1870, p. 263, a-oI. 24, fig. 3. 



Shell small, ovate-conic, crystalline, shining. Apex subacute. 

 Whorls 8, sutm"es moderately well impressed, the last whorl equaling 

 the rest of the shell in length. Base well rounded, smooth, excepting 

 a series of weakly developed spiral threads. Apertm'e semilunar, 

 oblique; outer lip tliickened, spirally liratcd within. 



De Folin' s type comes from Panama and measures : Length, 2 mm. ; 

 diameter, 1 mm. 



I have not seen this species and quote De Folin's description and 

 copy his figure. 



RISSOINA BURRAGEI, new species. 

 Plato 32, fig. 3. 



Shell small, broadly conic, bluish white; nuclear whorls 2^^, well 

 rounded, smooth; postnuclear whorls somewhat inflated, shouldered 

 near the summit, marked by very strong, cm^ved, protractive, sub- 

 lamellar axial ribs, of which 12 occur upon the first, 14 upon the 

 second and third, 16 upon the fom'th, and 18 upon the penultimate 



