REPORT ON THE GASTEROPODA. 043 



Seguertza, on whose authority this species was attributed as a fossil to the " Older Pliocene of 

 Sicily " (Gwyn Jeffreys, Ann. and Mag., April 1877, p. 336, Moll. " Valorous " Exped.), now considers 

 that his identification was inaccurate, and the species he took for this is distinct and new (Form. 

 Terz. Calabria, p. 250). 



2. Scaphander mundus, Watson (PI. XL VIII. fig. 2). 



Scaphander mundus, , Watson, Prelim. Report, pt. 20, Journ. Linn. Soc. Lond., vol. xvii. p. 342. 



Station 191. September 23, 1874. Lat. 5° 41' S., long. 134° 4' 30" E. Off Arrou 

 Island, west of Papua. 800 fathoms. Green mud. Bottom temperature 39° - 5 F. 



Shell. — Obliquely oval, thin, opaque, ivory-white, glossy, stippled in spiral lines, above 

 narrowed obliquely, concavely truncated, and on the right bluntly pointed, below rounded. 

 Sculpture: Longitudinals — there are very fine hair-like lines of growth, with slight 

 irregular interrupted and unequal undulations. Spirals — the whole shell is covered with 

 small shallow distant impressed dots : these above are roughly rounded or obliquely 

 longitudinal ; but from about one-third of the way down they become transversely elon- 

 gate : they are arranged in rows not quite equal, and which are parted by intervals of 

 fully double the breadth of the dotted rows : towards the point of the base the dots tend 

 to return to the round shape, and the rows of largish dots are parted by rows of minute 

 transversely elongated dots which occur in the intervals. Besides these, there are over 

 the whole surface the close-set superficial microscopic spiral lines, which seem to be a 

 characteristic of the genus. Epidermis excessively thin, membranaceous, and glossy, of a 

 faint straw colour. Colour ivory-white. Crown oblique. There is a slight indentation 

 or small conical pit almost completely coated with the glaze of the lip : this little pit is 

 encircled by a very slight and blunt keel. Mouth irregularly pear-shaped, being somewhat 

 narrowed above and expanded below. Outer lip projects a little angularly behind, and 

 here it is reverted, thickened, and appressed : from the highest point of its rise it sweeps 

 round to the point of the pillar with a very equable curve ; it is very patulous on the 

 base. Inner lip flexuous, being very convex on the body and openly concave on the pillar. 

 A very thin glaze extends from the outer lip above across the body to the pillar, which 

 has a pretty strongly reverted rounded and twisted edge, up which one can just see into 

 the interior of the shell for nearly two turns. H. 1*15 in. B. 0'78. Greatest breadth of 

 mouth, 0*61. 



This is a delicately beautiful shell, curiously intermediate between Scaphander lignarius (Linne), and 

 Scaphander puncto-striatus (Migh), while perfectly distinct from both In form it is less like a Bulla 

 than the latter, while the attenuation above is less, and the expansion of the outer lip below is even 

 greater than in the former. Lying on its face, it is broader and is more flattened, and that, too, 

 more obliquely than either. Its puncto- striate spiral sculpture approaches that of Scaphander puncto- 

 strialus (Migh.). 



