584. 
ZOOLOGICAL LITEKATURE. 
tomy given. In S.pentagommi and lofotense has been observed a single 
cylindrical thread or tentacle at the terminal disk of the foot ; as it is very 
difficult to see, it may have been overlooked in the others. The hinder aper- 
ture of the shell is entire in all these four species, whilst it is notched in S. 
vitreum ; the hindermost part of the shell is pentagonal and ribbed longitudi- 
dinally in pentagonum, Sars, Vidensk. Selsk, Fdrhandl. 1864, p. 16-36, pis. 
6. and 7. 
Siphonodentalium (Sars). The characters of this genus are revised by G. 
Jeffreys in his fourth dredging-report (pp. 3 and 4) j the posterior orifice ex- 
hibits two slight notches on each side, and the foot is ordinarily vermiform 
and pointed, expanding only in a flower-like shape when the animal 
uses it as a fulcrum, somewhat similarly to the foot of Leda and Nucida. To 
this genus are to be referred, according to the same author, also Dentalium 
quinqmngidare (Forbes) from the .^Fgoan Sea and Portugal, identical with 
D, pentagonum (Sars) from Norwa)^, and the tertiary i). hicannatum 
(Desh.). 
Dischidesis a new genus suggested incidentally by J. Gwyn Jeffreys, 1. c., 
for Dmtalium hijissum (S. Wood.), dredged in a living state off Gibraltar 
by Mr. M^Andrew. No generic characters are given. 
Cadulus, a genus proposed by Philippi, 1844, for Dentalmm ovnlum on 
account of the form of the shell, is reestablished by J. Gwyn Jeffreys, I. c. 
pp. 3-6 J it differs from Siphonodentalium (Sars) by the shell being quite 
smooth, transparent, and lustrous, tumid in the middle or anterior portion, 
and its mouth encircled by a narrow rim. It contains, according to him, the 
following species : — Dentalium gadus of Montagu j an allied species, D. cla- 
<vatum (Gould), from the China Sea j another from Mindanao ; Siphonoden- 
talium mhfusiforme of Sars, distinguished by two slight indentations of the 
posterior orifice, and dredged by Gwyn Jeffreys at Unst in 80-90 fathoms; 
finally the tertiary fossil D. coarctatum (Lam.). [This genus is evidently 
same as Ilelonyx, Stimps. 1865, and Gadila^ Gray, 1847, mentioned in Zool. 
Record, iii, p. 205.] 
CONCHIFERA. 
INCLUSA, Cuv. {Pholadacea, Acl.). 
PnOLADIDiE. 
. -Gonrad^s new catalogue of recent Mollusca, order Phola- 
dacea, comprises the families Pholadidoif Gastroclueyiidcey and 
Teredidce, with 22 genera and 140 species, the synonymy em- 
bracing several hundred names ; the nomenclature and syno- 
nymy are neaidy the same as those in the authors monograph 
of the Pholadacea, issued in 1862 ; the species published since 
that time are included in the present edition. The whole forms 
an appendix to the Am. Journ. Gonch. vol. iii. No. 3, with 
separate pagination. 
• Pholas parva (Penn.), from the coasts of Algeria and Spain ; the syno- 
nymes Ph. ligamentina and daetyloides (Lam.) are rather doubtful. Weiukaulf 
Oonchyl. d. Mittelmeers, i. p. 9. 
