. Mollusca ... Mollusks. BUTHVENIA. ;!i half the size, coloar more brown ; the spiral lirse are absent, save for a faint trace above the suture of a single one, and the costae almost obsolete ; the armature appears to be very similar, save that the palatal denticles are only three or four in ; (Sykes.) The parietal armature consists of two simple, subvertical plates which are somewhat thickened and truncate at the lower, and attenuated at the upper extremities ; these plates are separated by a distance of a quarterof a whorl,and the posterior one is the stronger (see fig. 9 d, whic
. Mollusca ... Mollusks. BUTHVENIA. ;!i half the size, coloar more brown ; the spiral lirse are absent, save for a faint trace above the suture of a single one, and the costae almost obsolete ; the armature appears to be very similar, save that the palatal denticles are only three or four in ; (Sykes.) The parietal armature consists of two simple, subvertical plates which are somewhat thickened and truncate at the lower, and attenuated at the upper extremities ; these plates are separated by a distance of a quarterof a whorl,and the posterior one is the stronger (see fig. 9 d, which shows the parietal wall with its two plates).. Kg. 9.—Buthvciiia ealiginosa. The palatal armature is in two vertical series : the anterior series consists of an obliquely ascending short quadrate tooth near the periphery, and below this an obHquely descending lamelliforui tooth, with a slight, horizontally elongated denticle below its posterior extremity ; the posterior series is similar to the anterior one, but the teeth are stronger and thicker in the former, while there is in addition a horizontally elongated denticle on the anterior side of the upper tooth. The specimen shown in fig. 9 CI/-C measures 6 millimetres in diameter, alt. 3 millimetres, and is in the collection of Mr. Ponsonby. The armatures are figured from the type-specimen in the collection of Mr. Sykes, who kindly permitted me to open the shell for the examination of this armature. 48. Euthvenia hiciliata, Pfeiffer. Helix biciliata, Pfeifi'er, P. Z. S. 1855, p. 112; Hanley & Theobald, Conch. Ind. 1875, pi. 159, %s. 1 &_4. Nanina {Hemiplecta) hiciliata, Pfeiffer, Malak. Blatt. ii, 1866, p. 121. MacrocUamys hiciliata, Pfeift'er & Clessin, Nomencl. Helic. "Vi\-. 1881, p. 45. Nanina (Kalielld) biciliata, Tryon, Man. Conch, ser. 2, ii, 188G, p. 67, pi. 28, figs. 7 & 8. Plectopylis {Syhesia) bidlata, Sykes, Proc. Malac. Soc. London, iii, 1898, & 160; Gude, Science Gossip, n. s. vi,
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