1867.] MR. A. ADAMS ON NEW JAPAN SHELLS. 313 



direction, obliquely upwards, on the fore part of the body. The ten- 

 tacles are filiform and very long ; and the eyes, large, black, and con- 

 spicuous, are on slight swellings at their outer bases. The front 

 edge of the mantle is extended, and gives the appearance of a large 

 veil over the head. The mantle is not developed, nor does it cover 

 the shell as in some members of the Fissurellidce, and neither the 

 mantle-margin nor anal tube is fringed. The edge of the mantle is 

 furnished with short papillae, four on each side and two behind, 

 which are recurved over the edge of the shell. The anal tube is 

 elongate and cylindrical, and is directed backw'ards and a little up- 

 wards through the foramen in the shell. The foot, large and fleshy, 

 is produced behind, and tapers to a point ; it is ovate in outline, 

 and the sides are simple and not furnished with cirri or papillae, as 

 is the case with some other genera of the family. 



In progression the form of the foot varies considerably, sometimes 

 being greatly dilated at the sides, and at others extended in front 

 and contracted and pointed behind. 



Hab. Tabu-Sima, Japan : dredged from 25 fathoms of water. 



There are about a dozen species of this group already described, 

 but the animal has not hitherto been figured. The tentacles are 

 red ; the eyes black, with a light areola ; the body is light brown, 

 lineated with darker brown. 



Genus Ccelopoma, A. Ad. 



Operculum elatum, conicum, concavum, corneum, lamina spirali 

 cornea insfrucfum. Testa subdiscoidea, late umbilicata : pe- 

 ristomate simplici, siiperne subangulato. 



C(ELOPOMA jAPONicxjM, A. Ad. (Pi. XIX. figs, 29, 29 a.) 



C. testa turbinato-depressa, striata, castanea ; spira vix elata, 

 sutura profunda ; anfractibus A\, convexis, cylindraceis, idtimo 

 antice subdilatato, descendente ; umbilico lata, prof undo ; aper- 

 tura perobliqua, vix circulari, peristomate recto, superne sub- 

 anffulato. 



Diam. maj. 14, min. 11, alt. 6^ mill. 



Hab. Tsu-Sima. On dead leaves among stones in shady woods 

 and rocky places. 



In this form of Ci/clophoridce the peritreme is similar to that of 

 Mi/xostoma or Cyclotus, being nearly simple and continuous, and 

 without the peculiar notch of Pterocyclos. The operculum, on the 

 other hand, is very similar in form to that of Vterocyclos, being ele- 

 vated, conical, and hollow ; but whereas in Pterocyclos the spiral 

 lamina is calcareous, and stands out horizontally from the margin of 

 the whorls, in Coeloptoma it is horny and closely imbricate. 



While the animal is on the move, the operculum, which is car- 

 ried close to the body, is received into the cavity of the wide 

 umbilicus, and the foot tapers into a point beyond. This is the 

 same moUusk I described in the 'Annals' for 18G1 as a species of 

 Pterocyclos. 



