1862.] MR, A. ADAMS ON JAPANESE OBELISCINZ. 231 
tenuibus nodulosis radiantibus et striis via elevatis concentricis 
crenulatis concinne decussata, latere postico longiore et dila- 
tato, umbonibus subacutis, epidermide fusco-pilosa partim ob- 
tecta. 
Hab. Lizard Island, Torres Straits. 
An oblique species, most nearly resembling L. multistriata, with 
the surface of the valves very neatly sculptured with numerous fine 
radiating ribs, crossed by slightly elevated concentric lines. 
/ ° 9. Limopsts woopwarpt, A. Adams. 
L. testa orbiculari, subequilaterali, convexa, marginibus crenulatis, 
candida, costellis acutis tenuibus radiantibus et lirulis concen- 
tricis crenulatis decussata, costellis breviculis circa marginem 
ventralem interpositis ad medium valvarum evanidis, linea car- 
dinis regulariter arcuata, dentibus acutis lamellatis prominen- 
tibus, fossa trigonali conspicua, margine ventrali intus levi. 
Had. Lizard Island, Torres Straits. 
This is a puré-white species, with the surface of the valves very 
delicately sculptured ; the ‘hinge-teeth are sharp and prominent, and 
the concentric liree cause the radiating ribs to assume a nodulous 
character. 
6. On THE SPECIES OF OBELISCINZ FOUND IN JAPAN, 
By Artuur ApAms, F.L.S., prc. 
In this subfamily of Pyramidellide, the members of which are 
nearly all of small size, and which appear to be tolerably numerous 
in the seas of Japan, the form of the shell is subulate, the texture 
vitreous, and the surface usually polished. Nearly all the species of 
Obeliscus and Syrnola are prettily adorned with a spiral red-brown 
zone, which usually marks a line at the sutures, and crosses the last 
whorl at the periphery. The Syrnole are usually of small dimen- 
sions, and the inner lip is always furnished with a single parietal 
plait: the Styloptygme have the peritreme entire, as in Chrysal- 
lida, but the whorls are not plicate. In most of the specimens 
of Syrnola found, the apex of the spire is seen to be decollated. 
This is owing to the extreme fragility of the nucleolar whorls, which 
in some species form a cylindrical transparent mucro, terminating in 
a little globose, decumbent, sinistral whorl. In S. cinctella, the 
mucro of which is very elongated, the number of similar pellucid 
nucleolar whorls is about eight. 
I have not hitherto been able to trace any connexion between the 
form or character of the shell and the internal transverse grooves 
seen in the whorls of so many species. Similar grooves are met with 
in several other genera of Pyramidellide, and also of Helicide and 
Ellobiide. That they serve some good purpose in the economy of 
the animal is no doubt true, although at present it has not been 
detected by our observation. 
The species of Syrnola usually inhabit deep water, and live on a 
