62 Moll, 
MOLLUSC A. 
to be placed among the Mollusca, Besides the general type of the nervous 
system, the bilateral symmetry, both externally and internally, and the 
presence of calcareous spicula in the integuments, are common to the 
Solenogastra and the Chitonidce. The plexiform arrangement of the 
nervous system, and the meeting of the efferent ducts of the genital and 
renal glands in the pericardium may be archaic characters of the Mol- 
lusca. Previous Note in Arch. Z. exper. ix. pp. xv. & xvi. Abstracts 
in J. R. Micr. Soc. (2) ii. pp. 31 & 32, and in Rep. Brit. Ass. 1881, 
pp. 673-675. 
^UL^fO^^ATA. 
The late Dr. L. Pfeiffer’s posthumous Essay o| a natural arrange- 
ment of the Ilelicuhey edited by S. Clessin, under the title “ Nomenclator 
Heliceorum viventium,” is useful as an index to nearly all the species 
known up to 1877 (some are omitted), with indications of descriptions, 
figures, and localities ; but the natural arrangement is not reliable, and 
full of mistakes, as neither author nor editor had the greater part of the 
species before him while occupied in the work, Pfeiffer having sold his 
collection several years before his death. 
Agnate A. 
Daudehardia. Young animals can withdraw completely into the shell. 
Hazay, Mai. Bl. (2) iv. p. 114. Electrical? power; vide supra, in 
generalities. Biology. 
Daudehardia lialiciensis and D. (Libania) calophana, spp. nu., both 
from Galicia, Westerlund, CEfv. Ak. Forh. 1881, pp. 50 & 51, and Nachr. 
mal. Ges. 1881, pp. 67 & 68. 
Daudehardia (Siversia) hey deni (Bottg.) = pawlenhoi (Bottg.), and 
D. {Rufina) lederi, sp. n., Transcaucasia, Bottger, JB. mal. Ges. viii. 
pp. 171 & 172, fig. 2, the latter figured pi. vii. fig. 2, and its description 
also in Nachr. mal. Ges. 1881, p. 118. 
Glandina algira (Brug.) var. mingrelica (Bottg.), Bottger, JB. mal. 
Ges. viii. p. 170, pi. vii. fig. 1, and Nachr. mal. Ges. 1881, p. 117, Kutais, 
Mingrelia. 
Streptaxis gigas, craveni and mozambicensis (E. A. Smith, 1880), figured 
by the author, P. Z. S. 1881, pp. 279 & 280, pi. xxxii. figs. 4-6, East Africa. 
Streptaxis regius, sp. n., and dunlceri var. n. clausa, Loebbeke, Nachr. 
mal. Ges. 1881, p. 60, Brazil? 
Streptaxis fuchsianus and S. (?) cavicola, spp. nn., Gredler, JB. mal. 
Ges. viii. p. 16, Prov. Hunan, China, the former pi. i. fig. 2. 
Streptaxis erythroceros, sp. n., Dinghushan, and costulatus, sp. n., 
Shiuheugfu, Mollendorff, JB. mal. Ges. viii. pp. 311 312, both in the 
Province of Canton. 
Ennea metula, sp. n., Crosse, J. de Conch, xxix. p. 193, pi. viii. fig. 3, 
Nossi-Comba, Madagascar. 
Ennea crosseana, incisi, martensiana, auriculata, pusilla, trigona, callosa, 
cryptophora, mariei, luhrica and vermis, spp. nn., dupuyana (Crosse) = 
quadridentata (Martens), a new variety, and hscheriana (Morelet, 1877, 
