FISSURELLID. 327 
GLYPHIS, Carpenter. (Capiluna, Gray.) Animal with the 
edge of the mantle fimbriated, and covering the margin of the 
shell. Shell with the surface cancellated, the margin crenulated, 
callosity often truncate, sometimes laminated. Young shell 
Rimuliform, with the spire absorbed in the increasing aperture. 
F. ineequalis, Sowb. 
OLYPIDELLA, Swainson. Shell oval, rugose, slightly elevated, 
truncated at the anterior extremity; perforation large, subcen- 
tral or somewhat anterior. Mantle-margin double, the edges 
scalloped and fringed, covering the sides of the shell; anal 
siphon surrounded by a fimbriated membrane ; foot large, fleshy 
and tubercular, with a series of rudimentary, tentacular filaments 
on the sides near the fore-part. F. pustulata, Lam. 1xxxiv, 31). 
FISSURELLIDZA, d’Orb. Shell small relative to the size of the 
animal, depressed ; perforation large, oval, central, with a callous 
border on the inner face ; margin smooth. Mantle greatly devel- 
oped, thickened at the edges and nearly covering the shell; foot 
very large and elongated. F. hiantula, Lam. (1xxxiii, 18). 
MACROSCHISMA, Swainson. Shell square-oval, roughly rayed, 
truncate at the end; perforation very large, subtriangular, elon- 
gated. “Animal large, larviform, greatly elongated, with the 
shell situated towards the posterior end. F. maxima, Ads. 
(ixxxiii, 19>. 
PUPILLA, Gray. Shell depressed, nearly smooth; perforation 
large, subcentral, oblong; margin white. Mantle coriaceous, 
entirely covering the shell, orifice of anal siphon small, oblong, 
at the anterior third; foot granulated, shorter than the mantle. 
The shell may be readily known by the sharp-edged, white 
border, which is received into the integument of the animal like 
one of the valves of a Chiton. It is an inhabitant of South 
Africa. F. apertura, Born (1xxxiii, 20). 
Rimuta, Defrance. 
Etym.—Diminutive of rima, a fissure. Syn.—Rimularia. 
Distr.—Several species found on sandy mud at low-water, or 
dredged in from 10 to 25 fathoms. | Philippines.— Cumine. 
Fossil, 3. species. Bath Oolite to Coral Rag; Britain and France. 
Rh. exquisita, Ads. (Ixxxiv, 32). 
Shell thin and cancellated, with a perforation near the anterior 
margin. 
PUNCTURELLA, Lowe. (Cemoria, Leach. Diadora, Gray.) 
Shell conical, elevated, with the apex recurved ; perforation in 
front of the apex, with a raised border (septum) internally ; 
surface cancellated. Mantle-margir simple, anal siphon promi- 
nent, tubular, with six papille in front and four behind; foot 
with a rudimentary operculigerous lobe. Distr.—6 sp.  Green- 
land, Boreal America, Norway, North Britain, Terra del Fuego. 

