PLEUROTOMA. 395 



Bergen to Spitzbergen in one hemispliere, and from 

 Cape Cod to Greenland in the other. This species differs 

 from P. rufa in having a longer body-whorl^ a smaller 

 and more abruptly tapering (but not turreted) spire^ an 

 oblique and shallow suture, and slighter ribs. It is the 

 Fusus pleurotomarius of Couthouy,, and Defrancia Vahlil 

 of Beck in Moller's Index. 



11. P. TURRi'cuLA^; Montagu. 



Murex turricula, Mont. Test. Br. (i.) p. 2G2, t. 9. f. 1. Mangelia turri- 

 cula, F. & H. iii. p. 450, pi. cxi. f. 7, 8, and (animal) pi. TT. f. 2. 



Body creamcolour, faintly suffused with brown, and some- 

 times closely covered with very minute chalk-wliite specks : 

 head small and thick : pallkd tithe cyUndrical and very long, 

 sometimes projecting in front like a horn : tentacles cylindrical, 

 extremely short above the eves, with blunt tips : eyes small, 

 placed on the extremities of stalks which are nearly three- 

 fourths of the length of the tentacles and are annexed to (but 

 not amalgamated with) them, giving to this part of the ani- 

 mal the shape of an elongated and irregular cone : foot large 

 and broad, truncated or bilobed in front, with small angular 

 corners, and bluntly pointed or rounded behind : [odontophore, 

 pleural spine straight, with a conical head and the side exca- 

 vated and open. (Loven.)] 



Shell oblong-fusiform, rather solid, semitransparent, and 

 lustreless : sndpture, strong, sharp, and narrow, but not very 

 prominent longitudinal ribs ; these are angular on the top of 

 each whorl, curved on the body-whorl, and nearly straight on 

 that portion of the other whorls which lies below the siiturai 

 ledge or step ; they extend to the suture and mouth, but not 

 to the base ; each of the last five whorls has from 12 to 15 

 ribs, the next has more, and on the preceding whorl they 

 become fine and close-set striae and are separated by the 

 stronger spiral striae ; they disappear towards the apex ; the 

 ribs are much narrower than their interstices ; the whole 

 surface (except the apex, which is quite smooth and glossy) is 

 thickly covered with fine, and usually equal-sized, spiral striae 

 (with frequently slighter intermediate striae), which are more 



* A turret. 



