THE MOLLUSCA—HEDLEY. 425 
I found this gregarious species in great numbers under stones 
between tide marks on the lagoon shore of Funafuti. Tenison 
Woods has described this as occurring in similar positions and 
abundance in tropical Queensland.* 
In this Museum it is represented from Torres Straits and Port 
Molle, Queensland, and the Solomons. 
PLANAXIS LINEATUS, Da Costa. 
Tryon, loc. cit., p. 278, pl. liii., figs. 49 - 57, 59, 63 — 66; pl. lii., figs. 
38 — 48. 
This species is also markedly gregarious. Little colonies 
occurred under stones between tide marks on the outer reef of 
Funafuti. 
Tryon mentions this from the Solomons, Tahiti and Paumotus. 
Melvill and Standen record it under the synonym of P. virgatus, 
Smith, from Lifu. Smith gives it from Fiji.t I have collected it at 
Oubatche, New Caledonia, and this Museum has it from Hawaii and 
the New Hebrides. 
MELANIA MAGENI, G'assves. 
Gassies, Faune Conchyliologique de la Nouvelle Caledonie, 1863, 
part i, p. 95, pl. vi., fig, 10. 
Abundant in the native wells at Funafuti. 
First described from New Caledonia, and lately recognised by 
Smith from Rotuma. Contrary to the priority given by Brot 
and Crosse this species has page precedence over M. montrouxert, 
Gassies. 
CAECUM VERTEBRALE, Sp. Nov. 
(Fig. 15). 
Caecum sp., De Folin, Challenger Reports, Zoology, 
xv., 1886, p. 684, pl. il., fig. 12. 
Shell of moderate size for the genus, white 
(? bleached), rather curved, slightly tapering, 
ornamented with twenty-five strong, pretty regular 
rounded, transverse rings, which are separated by 
interstices of corresponding breadth and depth. 
Septum a low rounded dome. Length 2:15, 
breadth °56 mm. 
A single perfect specimen, gathered on the sandy 
shore of the lagoon, is with some confidence identi- 
fied with a nameless fragment dredged by the 
“ Challenger ” off Honolulu. 
___ = ana ee o ae i sae: 
* Tenison Woods—Proe. Linn. Soc. N.S.W., v., 1881, p. 108. 
+ Smith—Journ. Linn. Soc., Zool., xii., 1876, p. 552. 
6. 
