2 EDGAR A. SMITH. 
NEOBUCCINUM TENERUM. 
(Pl. I., figs. 2, 2a.) 
Shell small, ovately fusiform, thin, subpellucid, horn-colour, covered with a very 
thin periostracum, exhibiting somewhat remote, slender, threadlike, arcuate, 
longitudinal lire, and rather obscure spiral strie between them. Whorls 64 convex, 
the first 24, forming the large protoconch, smooth, glossy; the rest not shining, 
separated only by a slightly oblique suture, the last rounded above, contracted 
anteriorly ; aperture subpyriform, acuminate above, and produced anteriorly into a 
short, open channel; labrum just a trifle thickened, brownish white within, gently 
curved in the middle when viewed laterally, very slightly faintly expanded, with a 
very shallow, broad, indistinct sinuation towards the suture ; columella curved above, 
rather straight below the middle, covered with a thin glossy callosity. Length, 15 
millim.; diam., 7; aperture, 6°5 long, 3°3 broad. Operculum (pl. I, fig. 2a) 
horny, reddish brown, marked externally with lines of growth, and exhibiting a 
nucleus which is paucispiral at the nuclear end. Lower surface roughened, with a 
narrow, red, raised ridge, parallel with the outer margin, which is smooth and shining. 
Length, 5 millim. ; width, 3. 
Off Coulman Island, 100 fathoms. 
The general form of the shell and the character of the operculum agree with 
Neobuccinum. It is of thin and delicate texture, and the very fine periostracum is 
produced upon the threadlike riblets at the upper part of the whorls, forming a 
sort of fringe below the suture. The riblets are about twenty in number on a whorl. 
Only a single specimen was obtained. 
TROSCHELIA ? 
(Pl. L, fig. 8.) 
Off Coulman Island, 100 fathoms. 
A young specimen, 19 millim. in length, is of interest as indicating the presence in 
the Antarctic region of a large species allied to Troschelia or Sipho, indeed, it bears 
considerable resemblance to the upper part of the northern Trosch. berniciensis (King). 
It consists of about seven whorls, which are slightly convex, increase slowly, and, 
although rather water-worn, the five upper ones exhibit traces of spiral striation. The 
two last whorls are covered with numerous thread-like spiral liree, some of which are 
thicker than others. These are crossed by oblique delicate lines of growth, and a thin 
straw-coloured periostracum invests the entire shell, excepting the upper worn volutions. 
Being a young shell, it is impossible to describe the probable form of the aperture or 
the character of the labrum and anterior canal of the adult. The last whorl is 
somewhat inflated at the middle, and contracted below into a short twisted recurved 
beak. The operculum is reddish, horny, and of the ordinary fusoid or unguiculate 
character, exhibiting distinct lines of growth and a terminal nucleus. A large operculum 
