MOLLUSCA. 
IT.—GASTROPODA. 
By Epnoar A. Smita, 1.8.0. 
(Plates I. and IT.*) 
ALTOGETHER twenty-six species of Gastropods (exclusive of a few Nudibranchs 
and some Pteropods) and fourteen Lamellibranchs were obtained by the Expedition, 
Three-fourths of these appear to be new. The majority of them are small and 
insignificant, but among the rest are a few striking forms, notably the new genus 
Trichoconcha, a very remarkable Chiton, the Trophon longstafi, and a beautifully 
sculptured Lima. A glance at the collection at once suggests that it was obtained 
either in deep water or a cold climate, for the almost total absence of colour in 
nearly every instance is characteristic. It does not show any particular resemblance 
to the Arctic fauna; indeed, the majority of the genera have almost a world-wide 
distribution. The genus Zrophon, for instance, although typically a northern and 
Antarctic group, has a characteristic representative in 7. carduelis of Watson, 
which occurs off Sydney in 410 fathoms; and it will probably eventually be shown 
that many genera, which are usually regarded as peculiarly Arctic, have a much 
wider range than has been anticipated, although they may occur at much greater 
depths than in northern latitudes. Of the previously described species recorded in 
the following pages nearly all are known from Kerguelen Island, and possibly most 
of the remainder may also occur there. Only a single species was collected which 
was obtained by the ‘ Belgica.’ 
NEOBUCCINUM EATONI. 
Buccinopsis eatoni, Smith, Ann. Mag. Nat. Hist., Vol. XVI., 1875, p. 68. 
Neobuccinum eatoni, Smith, Phil. Trans. Roy. Soc., Vol. CLXVIII., 1879, p. 169, pl. ix., figs. 1, Ja; 
Tryon, Man. Conch., Vol. IIL, pp. 100, 197, pl. Ixxvii., figs. 357, 358; Smith, ‘Southern Cross’ 
Mollusca (1902), p. 202 ; Martens, Deutsch. Tiefsee Exped., Vol. VIL., p. 63 (1903). 
Six miles N.W. of Hut Point, 180 fathoms. 
A single specimen only was obtained. It is of the same elongate type as those 
collected by the ‘Southern Cross’ Expedition at Cape Adare in 7-10 fathoms. 
* For explanation of plates, see Lamellibranchiata, p. 7. 
