80 Moll. 
MOLLUSCA. 
2. Siphonopoda. Posterior aperture of the shell entire or with 
several notches, and without supplementary tube. Foot elon- 
gated, worm-like, provided at the tip with a circular disc, the 
edges of which are beset with papillae. Edge of the lateral 
plates of the radula distinctly tridentate. 
Gen. Siphonodentalium (Sars), Siphonentalis [infra], and 
Cadulus (Phil.). 
Moll. arct. Norveg. pp. 100-107. 
[Dentalium'} Antalis striolata (Stimps.), whole coast of Norway ; Sars, 
1. c. p. 101, pi. ii. fig. 1, & pi. XX. fig. 10 ; radula, pi. i. fig. 1. 
Dentalium doncinnum, sp. n.. Martens, SB. nat. Fr. 1878, p. 134, Western 
Africa, 10*^ N. lat., 17® W. long., 360 fath. 
Dentalium perlongum, sp. n., Dali, Bull. Mus. 0. Z. v. p. 61, Gulf of 
Mexico, below 200 fath. (not described). 
Dentalium Iceve and sexangulare,&p^. nn., subfossil, Hilgard & Hopkins, 
Rep. Boring Mississippi, 1878. 
Siphonodentalium (M. Sars). Restricted to the species in which the 
posterior aperture has several notches ; terminal disc of the foot concave, 
without median tentacle. Type, S. vitreum (M. Sars). G. O. Sars, 1. c. 
pp. 106 & 342, pi. vii. fig. 2 ; radula, pi. i. fig. 2. 
Siphonentalis j g. n. Shell elongate, posterior aperture entire, circular ; 
terminal disc of the foot convex, with a single median tentacle. S. lofo- 
tensis and affinis (M. Sars, as Siphonodentalium) and tetragona (Brocchi, 
as Dentalium) = D. quinquangulare (Forbes). G. O. Sars, 1. c. pp. 104 
& 105, pi. XX. figs. 11-13 ; radula, pi. i. figs. 3 & 4, Norway. 
Cadidus propinquus, sp. n., id. 1. c. p. 106, pi. xx. fig. 15 ; radula, pi. i. 
fig. 5, Norway, 100-150 fath. 
BIVALVIA, Linn. 
(Lamellibranchia, Cuv.) 
For observations on anatomy, and structure of gills, adductor muscles, 
and foot, see, in the General Subject, Anatomy and Physiology, suprdj 
pp. 9 & 10. 
PnOLADIDiE. 
Barnea heccariiy sp. n., Tapparone-Canefri, Ann. Mus. Genov, vii. 
[1875] p. 1032, Kei Bandan, Papuan Islands. 
Corbulidj:. 
Corhula fortisulcata^ sp. n., E. A. Smith, P. Z. S. 1878, p. 819, pi. 1. 
fig. 23, Andaman Islands. 
Corhula haastiana^ sp. n., Hutton, J. de Conch, xxvi. p. 44, New Zea- 
land. 
Necera arctica (M. Sars), ohesa (Loven), suhtorta, sp. n., glacialis, sp. n., 
andjw^osa (Wood) ; G. O. Sars, Moll. arct. Norveg. pp. 85-88, pi. vi. 
figs. 5-9, Arctic Norway. 
