SYKES : MOLLUSCA OP " P0KCT7PINE " EXPEDITIONS. 181 



in the excavated area below the suture ; it may be the form referred * 

 by these authors to Jeffreijsi^ Verrill, from which it appears to me to 

 differ in the shape of the whorls, length of canal, and, from Verrill's 

 figure, in the longitudinal sculpture. It is the spinulosa, Jeffreys MvS. 



Pleurotomella iMPLiciscuLPTA (Sturauy). 

 Befrancia impliciscidpta, Sturany : Mollusken gesamm. Pola, 1890-4, 



p. 12, pi. i, figs. 10-12 (1896). 

 Pleurotomella impliciseulpta, Sturauy : Kobelt, p. 388. 

 Defrancia gibhera, Jeffreys : Hep. Brit. Assoc, 1873, p. 113 [nom. sol.]. 

 Pleurotoma gihhera, Jeffreys : Monterosato, Nuova Kevista, 1875, p. 44 ; 

 Enum.'e Sinon , 1878, p. 47; Bull. Soc. Mai. Ital., 1880, p. 77 

 [nom. sol.]. 

 Leufroyia gibbera, Jeffreys: Monterosato, Nat. Sicil., 1890, p. 27 

 [nom. sol.]. 



"Porcupine" Expedition, 1870, Stations 30, 50, 56; Adventure 

 Bank, 92 fathoms. 



Distribution. — Palermo, Santo Vito, etc. (Monterosato); deep water 

 off Alexandria (Sturany). 



I have to thank the Marquis de Monterosato for the bibliographical 

 details, as also for the clue to the above identification. No description 

 of the name gibbera has ever appeared. 



Pleurotomella (?) lusitanica, n.sp. PI. XVI, Figs. 3, Za. 



Shell moderately elongate, somewhat fusiform in shape, the spire 

 well raised. Colour white, the protoconch stained with chestnut. 

 Whorls about 7, rather flattened, with a well-marked suture. Apical 

 whorls 3, the first being almost smooth and the others decussated by 

 arcuate riblets. The remaining whorls are sculptured spirally by 

 numerous flat, broad riblets, which (under a lens) are seen to be about 

 twice as wide as their interstices, and to be crossed by lines of growth, 

 which give them a roughened or scabrous appearance. The last 

 whorl is large ; the aperture being somewhat squared at the base, and 

 with no noticeable sinus ; the outer lip thin and regularly arcuate. 

 The columella is fairly straight above, a trifle twisted at the base, and 

 has a light callus on its lower portion. Long. 6, lat. 3 mm. 



"Porcupine" Expedition, Station 17. 



Seven specimens of varying ages: the above diagnosis is ' composite,' 

 as the protoconch in the type is rather worn and a little injured. 

 One specimen (broken) is larger than the dimensions given. 



Nearly related to Blanchardi, Dautz. & Pischer, but, from their 

 figure, the present shell is more slender and the mouth is not so 

 broad ; also the interstices of the spii'als are not nearly equal in 

 breadth to the spirals themselves. 



It is also akin to Dalmasi, Dautz. & Fischer, which was found with 

 it. From that species it may be severed by the form being less 

 elongate, the base not being so pointed, but squarer, with a corre- 

 sponding difference in the shape of the mouth. The spiral sculpture 

 is of a different nature in the present shell, and the zone below the 



1 Mem. Soc. Zool. France, vol. ix, p. 411. 



