MAEINE MOLLTJSCA OF MADBIEA. 237 



white, somewhat opaque, and with a yellowish tinge. Spire 

 not in the least prominent, the ajDex being small, mammiform, 

 and slightly sunken ; round it rapidly enlarging, and defined 

 by a small slightly impressed suture, coils a single whorl whose 

 upper narrow, flattened but rounded edge slightly overtops the 

 apex. Mouth very large, being about 4 times as broad as the 

 body, narrowing above, it is very wide and scoop-like in front. 

 Outer lip perfectly straight and parallel to the axis, at the top and 

 at the base it turns quickly but roundly and a little patulously 

 to join the spire. Inner lip has a narrow thin appressed glaze 

 across the upper part of the very slightly oblique body ; after 

 the glaze dies out, the thin sharp lip runs on with a slight twist 

 to join the outer edge of the shell. — L. 0'07 ; do. of the body-whorl 

 0-05. B. 0-056. 



Punta de Sao Lourengo, Santa Cruz, Porto Santo, to 50 fms. 

 Not rare. 



In shape this species is very like the young o£ P. aperta (L.), 

 but is slightly narrower ; the outer lip does not rise so high as 

 in that species ; the body-whorl is slightly narrower, longer, and 

 more parallel to the axis : texture and sculpture are of course 

 quite different, and the full-grown shells are utterly unlike. Than 

 P. scabra, Miill., this is broader, the top does not slope obliquely 

 down to the right ; the body-whorl is narrower and not so much 

 swoln to the right, and its direction being more oblique the shell 

 is more narrowed upwards ; the whole front of the shell below 

 is wider, opener, more scoop-shiaped. The chain-link sculpture is 

 in a single row, and is only doubled when a fresh row first begins 

 to appear : the links are fully 3 times as long as they are broad. 

 Th&u. P. catena, Mont., this is much wider, opener, and straighter . 

 the sculpture-chains are more distant from each other, and the links 

 are smaller and longer. P. Loveni, Malm, is much, narrower, has 

 a larger body-whorl; the outer lip ialls much short of the apex, 

 the chain-sculpture is double, and the links are much shorter. 

 P. cingulata, Sars, and P. quadrata, "Wood, difler much from this 

 both in form and sculpture. 



Fam. DoEiDiiD^. 

 G-en. DoEiDiUM, Meckel. 



6. DOEIDHIM (?) LAUEENTIANFM, U. Sp. (Not figured.) 



Sody unknown. 



Shell small, but relatively to its size strong, somewhat flattened 



