422 FUNAFUTI ATOLL. 
development of the basal rib, and the number of longitudinal 
plications vary also. The transverse markings are not grooves, 
as Adams’ description would mislead one to suppose, but elevated 
threads. The difticulty I found in naming this species induces me 
to offer a drawing for the assistance of others. 
Authentic specimens of A. turricula, Pease, from Hawaii, en- 
able me to unite it with the above, a conclusion which Weinkauft’s 
bad figures would not have suggested. 
A specimen from British New Guinea is contained in this 
Museum. Tryon quotes #. turricula from Fiji. 
RissoInA AMBIGUA, Gould. 
Gould, Moll., U.S. Explor. Exped., p. 217, pl. xv., figs. 26la—c; 
Tryon, Man. Conch., ix., 1887, p. 371, pl. lv., figs. 27, 29, 31, 
35 ; pl. liv., fig. 7. 
A few worn specimens were collected on the lagoon beach. 
They belong to a variety with smaller and more numerous ribs 
on the last whorl than the type. 
This is one of the most abundant and widespread species in the 
Pacific. It was first found in the Paumotus Group. I have 
seen specimens from Tahiti. Pease found it in the Hawaiian and 
Garrett in the Fijian Islands. I have collected it in Port Moresby, 
New Guinea, and again at Panie, New Caledonia. 
RISSOINA AFFINIS, Garrett. 
Garrett, Proc. Acad. Nat. Sci. Phil., 1873, p. 212, pl. i., 
fig. 10. 
One specimen from the lagoon beach resembles Garrett’s figure 
and description, but differs in being microscopically striated above 
and below the periphery, and also in being eight instead of 5 mm. 
long. 
RIsSOINA SPIRATA, var. SUPRACOSTATA, Garrett. 
Garrett, loc. cit., p. 209, pl. ii., fig. 1; Tryon, foc. cit., p. 388. 
A small specimen, even more drawn out than Garrett’s figure, 
from the lagoon beach. 
DIALA VIRGATA, Sp. Nov. 
(Fig. 14). 
Shell imperforate, narrow, regularly conical, obtusely angled at 
the periphery, blunt at the tip, surface dull. Colour most variable, 
typically about half-a-dozen broad, irregular, opaque, white stripes 
extend longitudinally upon a translucent white ground from the 
suture to beyond the periphery of the last whorl, and cross the 
full breadth of the earlier ones. The translucent ground, but not 
the opaque patches, are crossed by an indefinite number, commonly 
