THE MOLLUSCA—HEDLEY. 447 
half its size, has decided me, in the absence of other information to 
regard it as distinct. A shell from Port Moresby closely resembles 
the Ellice one, differing by larger size and more swollen contour. 
TRIFORIS INCISUS, Pease. 
(Fig. 33). 
Tryon, Joc. cit., p. 190, pl. xxxix., fig. 65. 
The inadequate description and poor figure quoted, suggest, but 
fail to demonstrate, that a shell figured herewith should be so 
named. The species is represented by a single, perforated and 
decollated example from the Funafuti lagoon. It is 5} mm. in 
length, has thirteen whorls remaining, and in colour is ochraceous 
splashed with white. The last whorl has six spiral ridges, two of 
which are basal; the three preceding whorls have each three, and 
those above each two such ridges. The ridges are smooth, elevate 
and keeled, the anterior of each series the larger; on the upper 
Fig. 33. 
whorls the posterior ridge tends to divide into beads. The inter- 
stices are broad, deep and finely spirally grooved. The spur of 
the outer lip crosses the pillar. Anal notch deep and cordate. 
Canal short and perpendicular. 
Pease described 7’. incisus from Hawaii.* I have collected at 
Port Moresby, British New Guinea, what seems a form of that 
described above. It differs in colour being variegated with blatk, 
chocolate and white. The uppermost ridge has not the same 
disposition to become beaded but longitudinal plications are 
developed in the interstices. The protoconch in these Papuan 
shells is six whorled, bicarinate and crossed by coarse bars, like 
the apex I figure for 7’. obesula. 
* Pease—Proc. Zool, Soc., 1860, p. 434. 
