RISSOIDA. 8I 
Genus, BARLEEIA—Clark. 
Operculigerous lobe simple ; foot slightly emarginate posteriorly ; 
operculum testaceous, sub-annular, under surface with a raised rib and 
a long, pointed, testaceous apophysis proceeding from the nucleus. 
Shell turbinately conical ; whorls tumid, smooth or transversely striated ; 
aperture oval, entire, contracted behind, rounded in front; outer lip 
acute, simple. 
B. flamulata, Mutton, Jour. de Conch., 1878, p. 28. Smooth; 
red, generally with oblique white rays ; whorls 6 or 63. 
Length, °25. 
Auckland. 
B. rosea, Mutton, CAZM., p. 29. Ovate; whorls 4, rather flat, 
smooth, polished ; mouth round ; white or bright-pink. 
Length, ‘07 ; breadth, ‘os. 
Stewart Island. 
B. nana, Hutton, CMM, p~. 28. Whorls 5, swollen, finely 
transversely ribbed ; aperture ovate ; white. 
Length, ‘1; breadth, ‘o5. 
B. impolita, Hutton, C.M.M., p. 29. Ovate ; whorls 4, rounded, 
finely spirally striated ; mouth ovate ; white, not polished. 
Length, ‘1 ; breadth, ‘06. 
Stewart Island. 
Genus, BY THINELLA—Moguin-Tandon. 
Operculigerous lobe simple; operculum sub-spiral. Shell elonga- 
tely conical, thin, smooth, covered with an olivaceous epidermis ; axis 
imperforate ; aperture oval; peritreme continuous; outer lip acute, 
simple.* 
Fresh water. 
B. antipoda, Gray; Dieff, N.Z., ii, p. 241; Voy. Erebus and 
Terror, Moll., pl. 1, f. 19. Shell ovate, acute, sub-perforated, (generally 
covered with a brown earthy coat); whorls rather rounded ; mouth ovate ; 
axis three lines ; operculum horny and sub-spiral (Gray.) 
Var.—Spire rather longer ; whorls more rounded. (Gray.) 
Auckland. Dunedin. 
B. zealandiz, Gray; Dieff, N.Z., ii, p. 241; Voy. Erebus and 
Terror, Moll., pl. 1, f. 19 (below). Shell ovate, turreted, imperforated, 
pellucid, greenish, generally covered with a brown earthy coat ; whorls 
* I follow the Rev. J. Tension-Woods in putting these shells into the genus 
Bythinella, but they are very different in form from Bythinella nuclea (Lea) from 
California. Mons. Fischer considers that Hydrobia should be restricted to marine 
shells only ; Dr. Paladilhe, on the contrary, restricts it to fresh water forms 
(Ann. d Sci. Nat., vi-i., p. 7.) 
