182 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



suture in Dalmasi, marked by arcuate striae, is lacking in P. lusitanica. 

 In form the shell recalls Baphnella pompholyx, Dall, but diifers 

 apparently in the spirals, judging from his figure. 



Pleukotomella megalembryon (Uautzenberg & Fischer). 

 Pleurotonia megalemhrijon, Dautz. & Fischer : Mem. Soc. Zool. France, 

 vol. ix, p. 420, pi. xvii, fig. 14. 

 "Porcupine" Expedition, 1870, Station 17 (five specimens). 

 Distribution. — Off the Azores, in deep water. 

 I have to thank Mons. Dautzenberg for the identification. 

 Pleukotomella (?) nodulosa (Jeffreys). 

 Defrancia nodulosa, Jeffreys : Ann. Nat. Hist., ser. v, vol. x, p. 32. 

 "Porcupine" Expedition, 1870, Station 55, 1,456 fathoms. 

 Distribution. — Deep vpater in the Mediterranean. 

 See notes under Pleurotoma macra, Watson. 



Pleukotomella (?) obtusum [(Jeffreys) Locard]. 

 Pleurotoma obtusum, Jeffreys : Locard, Exped. Sclent. Trav. Talisman, 

 vol. i, p. 202, pi. ix, figs. 12-16 ; Kobelt, p. 318. 

 "Porcupine" Expedition, 1870, Stations 24 and 30. 

 Distribution. — Deep water to the south and west of Portugal. 

 Pleukotomella (?) serga (Dall). 

 Pleurotoma serga, Dall: Bull. Mus. Comp. Zool., vol. ix, p. 65; 



vol. xii, pi. ix, fig. 4 ; vol. xviii, p. 114. 

 Mangilia serga, Dall: Locard, Exped. Sclent. Trav. Talisman, Moll., 



vol. i, p. 233. 

 Pleurotoma acanthoses, Watson : Challenger Rep., Gasteropoda, p. 342, 

 pi. xxiii, fig. 3. 

 "Porcupine" Expedition, 1870 (see below). 



Distrihution. — Both sides of the Mid-Atlantic in deep water, also off 

 the Azores. 



Two lots in the Museum, which I attribute to this species, bear 

 several station numbers whose accuracy is uncertain. I have also 

 the earlier whorls of a specimen from Station 17, and similar 

 fragments from Stations 30 and 56. 



Pleukotomella subaraneosa (Dautzenberg & Fischer). 

 Pleurotoma subaraneosa, Dautz. & Fischer : Mem. Soc. Zool. France, 

 vol. ix, p. 422, pi. xvi, figs. 11, 12. 

 "Porcupine" Expedition, 1870, Station 17. 

 Distribution. — Off the Azores, in deep water. 



A long series of this handsome shell ; it is the Pleurotoma exquisita, 

 Jeffreys MS. 



Pleukotomella thaumastopsis (Dautzenberg & Fischer). 

 Pleiirotama thaumaxtopsis, Dautz. & Fischer : Mem. Soc. Zool. France, 

 vol. ix, p. 426, pi. xvi, fig 14. 

 "Porcupine" Expedition, 1870, Station 17. 

 Didribidion. — Off the Azores, in deep water. 

 Two very young specimens. 



