VERMETID,® — TROCHIDiE. 137 
X. Serpulorbis (Sassi) : operculum none (subgen. Thylacodes) or rudi- 
mentary (subgen. Btvonia). 
2. Siphonium (Gray) : operculum complete j shell smooth inside. Sub- 
genera : Siphonium^ s. str., Stephopomaj Vermiculm, and Spiroyluphus. 
3. Vermetus ( Adanson) : operculum complete ; shell with internal plaits. 
Subgenera : Vermetus, s. str., and Petaloconchus. 
Serpulorbis lamarcki, sp. n. ; Siphonium annularium, new name for Serpula 
annulata (Lara., nee Daudin) j Vermetus roussaei \_rousseaur\, new name for 
V. sipho (Rousseau, nec Lara.) : id. 1. c. pp. 181-200. 
Vermetus. Notes on its development by Kowalewsky, Z. Viss. Zool. xxii. 
p. 289. 
CALYPTRiEID.®. 
[ Trochita\ Cahjptrcea cJiinensis (L.). Its development described by Salensky 
in Trans. 3rd Meeting of Russian Naturalists at Kiew, and in Z. wiss. Zool. 
xxii. pp. 286-288, and pp. 428-445, pi. 35, pi. 36. figs. 11-15 & 22, pi. 37. 
figs. 20 & 21. He insists on the formation of the nervous centres being later 
than that of the otoliths, and on the presence of some provisional organs, 
which perish in the later course of development, such as the cephalic vesicle, 
analogous to the cervical vesicle of the Pulmonates, the larval heart and pri- 
mordial kidneys, which are replaced at a later period by other kidneys 
situated in another part of the body ; and he criticizes some observations 
made by Stephanoff in a Russian dissertation concerning the development of 
the same species, published in 1868. 
Crepidula sitkana (Middend.) scarcely distinct from fornicata (L.), and 
C. unguiformis (L.), all from Alaska. Martens, Mai. Rlatt. xix. pp. 88 Sz 89. 
SCUTIBRANCHIA. 
NERITIDiE. 
Neritina violacea (Gm^l.^—crepidularia (Lam.), with varr. depressa (Bens.) 
and exaltata (R^cluz), and cornucopia (PQns,.') = melanostoma (Troschel) = 
tourannensis (Souleyet), both from the East Indies, described comparatively 
by Morelet, J. de Conch, xx. pp. 133-140. 
Neritina virginca (L.) is very large in fresh water, of less size in 
brackish water, and quite small in the sea. Gloyne, ,T. de Conch, xx. p. 37. 
Neritina holosericea, sp. n., Garrett, Am. .1. Conch, vii. p. 219, pi. 19. fig. 1, 
Vanna Levu, Viti I. 
Navicella aponogetonis (Vahl, 1798) redescribed by Morch, J. de Conch, xx. 
p. 342, East Indies, probably coast of Cdromandel. 
Navicella picturata, sp. n., Garrett, 1. e. p. 224, pi. 19. fig. 13, Viti I. 
TROCHIDiE. 
The development of 2 varr. of Trochus varius ? from the Black 
Sea has been described by W. Salensky. The circular velum 
is here the first organ appearing ; the front part of the intestine, 
with the mouth, comes after and somewhat behind it, as in the 
larvjB of the Annelida, and still later the foot, the shell, and the 
bilateral transformation of the velum ; whereas in Calyptraa, and 
o 
K 
