Fissurella.] GASTROPODA. 97 



Genus 1. FISSURELLA, Bruguiere, 1791. 



Fissurella, Brug.. Encycl. Meth. ; Lamarck, A.s.V., &c. Type: F. piclu. 

 Gmel. 



The anatomy of the typical species is not thoroughly known. It 

 appears that the mantle-edge is thick, crenulated above and below, 

 granulate or papillose on its rather broad surface ; the anal pore is 

 surrounded by slender processes or papillae, and the row of epipodial 

 papillae is continuous. 



Summit of the shell near the middle ; basal margins level, not 

 elevated at the ends ; form of shell elevated conoidal, with an apical 

 perforation ; surface nodulous or decussate. 



Sect. 1. CREMIDES, H. and A. Adams, 1858. 

 Cremides, Ad., G.R.M., i, 446. First species : F. alabastrites, Reeve. 



Fissurella with the orifice near the middle, the outer surface radiately 

 ribbed or striated, the inside without a dark marginal border, and 

 more or less crenulated on the edge. 



They inhabit tropical and subtropical coasts of America, with a 

 few species from South Africa and the Mediterranean. 



1. Fissurella Huttoni, Suter, 1906. Plate 8, fig. 4. 



Fissurella squamosa, Bhitton, C.M.M., 1873, 42; M.N.Z.M., 105; P.L.S. 

 N.S.W., ix, 370, not of Deskayes. Glyphis squamosa, Hutt., Man. Conch. 

 (1), xii, 216. Fissurella Huttoni, Suter, T.N.Z.I., xxxviii, 322. 



Shell elongately oval, narrowed in front, conoidal, summit a little 

 in front of the middle. Sculpture consisting of numerous more or 

 less squarnose ribs, alternately larger and smaller, 4 anterior and 4 

 posterior ribs more prominent than the others ; they are crossed by 

 fine concentric growth-striae, much more distinct near the base. Colour 

 light brown, most of the ribs lighter, cinereous. Dorsal orifice ojblong, 

 becoming smaller as it penetrates ; its length measured outside is 2 mm. 

 Inside white, porcellanous, muscle-scar distinctly impressed, perfora- 

 tion callus strong, white, with a minute posterior incision, encircled by 

 a light-brown line. Margin irregularly crenulated. 



Length, 23 mm. ; breadth, 15 mm ; height, 7 mm. 



The animal is unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Foveaux Strait (fide Hutton). 



Remark. As far as I am aware, the type specimen is the only one 

 in any of our collections. 



Subfam. 2. EMARGINULIN^E, Pilsbry. 



Apex of shell generally not removed, the anal tube occupying an 

 anterior slit, notch, or sinuation, or if apex be removed by a perfora- 

 tion the hole is provided internally with a shelf or septum projecting 



4 Moll. N.Z. 



