FISSURELLID^, 32t 



GLYPHis, Carpenter. (Capiluna, Gra3\) Animal with the 

 edge of the mantle fimbriated, and covering the margin of the 

 shell. Shell with the snrface cancellated, the margin crenulated, 

 callosity often truncate, sometimes laminated. Young shell 

 Rimuliform, with the spire absorbed in the increasing aperture. 

 F. insequalis, Sowb. 



CLYPIDELLA, 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. dxxxiv, 31). 



FissuRELLiD^A, 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. (Ixxxiii, 18). 



MACROSCHiSMA, Swalnson. 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, Grray. 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 Soiith 

 Africa. F. apertura, Born (Ixxxiii, 20). 



RiMULA, 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. — Cuming. 

 Fossil, 3 species. Bath Oolite to Coral Rag ; Britain and France. 

 R. exqv.isita, Ads. (Ixxxiv, 32). 



Shell thin and cancellated, with a perfoi'ation near the anterior 

 margin. 



PUNCTURELLA, Lowe. (Ccmoria, 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-margin simple, anal siphon pi'omi- 

 nent, tubular, with six papillae in front and four behind ; foot 

 with a rudimentary operculigerous lobe. Distr. — 6 sp. Green- 

 land, Boreal America, Norway, North Britain, Terra del Fuego. 



