240 EET. E. B. WATSON ON THE 



dominated by tlie further growth of the first whorl, which rises 

 up on the left and forms the most prominent part of the shell at 

 this end as it turns over with a sharp twist and encloses a small 

 pear-shaped body-space within the inner lip, which, with a sharp 

 finely-projecting edge, sweeps freely round and, slightly expand- 

 ing, runs straight down to the base, where, scoop-like and with a 

 semicircular curve, it passes round to form the sharp, barely 

 curved outer lip, which, parallel to the other, rises to or nearly 

 to the full height of the apex, leaving, however, a small nick at 

 its junction with the apical whorl. — L. 0"18. B. O'll. 



A well-marked species, to which I have attached the name of 

 M . Ph. Dautzenberg, who, in conj unction with M. Henri Fischer, 

 is so ably working out the Prince of Monaco's dredgings in the 

 ' Hirondelle ' and the ' Princesse Alice ' at the Azores. 



The species is not very common. I have the two specimens 

 of it got by the Eev. E. T. Lowe in 1829 at Magdalena. Another 

 of his specimens and a few of mine came from near Punchal, but 

 most of mine and one of his came from the east end of the south 

 shore towards Punta de Sao Lourenco. 



Mr. Lowe has a note on the living specimen which he got at the 

 Grorgulho, near Punchal, that the "animal was white, subpellucid, 

 about ^ in. long," that " the edges of the mantle were loose and 

 floating, as in Sigaretus " ; the branchiae he says he had not seen. 



9. Pletjrobkanchus Lowei, n. sp. 



Shell strong, shallow, long, narrow-pointed and gathered in 

 at the caudal end, broad, flat and open at the cephalic end, with 

 nearly straight sides. Colour white and translucent. Sculpture 

 fine sharpish regular lines of growth ; of longitudinals, a sug- 

 gestion is traceable under the microscope in exceptionally good 

 light — a very faint trace of such a diagonal impression as forms 

 so marked a feature in P. plumula, Mont., is visible on the 

 outside and shows more distinctly in the interior. Spire consists 

 of 3| well-rounded whorls parted by a distinct impressed, slightly 

 marginated suture ; the apex lies flat on the back of the shell 

 and a little behind the extreme point ; the tip is minute, rounded, 

 and glossy, of a pale ruddy-brownish colour ; from this point 

 the two sides slope away as a cloak hangs on a peg, and the back 

 of the shell is here well rounded. Mouth spreads fully open 

 but for the small, long, narrow curved chamber which lies in 

 under the spire and the edge of the inner lip. Outer lip rises 



