MARINE MOLLTTSCA OF MADEIRA. 237 



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

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

 and slightly sunken ; round it rapidly enlarging, and denned 

 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. O07 ; do. of the body-wliorl 

 0-05. B. 0-05(3. 



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

 Not rare. 



In shape this species is very like the young of 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. scahra, Mull., 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-shaped. The chain-link sculpture is 

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

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

 Than 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 falls much short of the apex, 

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

 P. cingulata, Sars, and P. quadrata, Wood, differ much from this 

 both in form and sculpture. 



Pam. Doeidiidje. 



Gen. Doridium, Meckel. 

 6. Doridium (?) laurentianum, n. sp. (Not figured.) 

 Body unknown. 

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



