; KEPORT ON THE GASTEROPODA. 485 



9. Odostomia scopxdorum, n. sp. (PL XXXI. fig. 5). 

 July 1875. Reefs x off Honolulu. 40 fathoms. 



Shell. — Very small, oblong, few - whorled, tubercled, white, with a deep channelled 

 suture, an obliquely truncated tip, and a short round base. Sculpture: on the lower 

 whorls there are three strong spiral threads and three furrows ; the first two threads are 

 formed by rounded tubercles arranged in rows so as to form slightly oblique longitudinal 

 riblets ; the furrow parting the two threads is very slight ; below these tubercled threads 

 is a sharp narrow deepish furrow succeeded by a square-cut thread ; somewhat stronger 

 than the furrow is a deep square-cut channel at the suture ; below this sutural furrow, on 

 the base there are two more strong threads and furrows, the last furrow encircling the 

 pillar. Colour porcellanous white. Spire short, with convex outlines. Apex abrupt, 

 blunt and oblique. It consists of 1^ smooth keeled whorls ; the extreme tip is turned in. 

 Whorls 5 in all, flat on the sides and subconical ; they are all small, only the last is 

 somewhat lengthened, having a rounded and slightly produced base. Suture rectangularly 

 impressed and somewhat oblique. Mouth small and shortly pear-shaped. Outer Up sharp, 

 straight to the edge of the base, where it is rounded and patulous. Inner Up strong, with 

 a prominent edge, curved throughout its course with a strong oblique deep-set tooth about 

 the middle. H. 0'048 in. B. 0'02. Mouth, height 0'015, breadth 0-013. 



This is something like an extremely small Odostomia excavata, Phil., but obviously very different. 

 It has a vague resemblance to Oscilla ligata, Ang. (Proc. Zool. Soc. Lond., 1877, p. 173, pi. xxvi. 

 fig. 11), but differs in size, in sculpture, and in form of apex. There is a small shell from Station 

 188, west of Cape York, Australia, 28 fathoms, which probably belongs to this species, but as, 

 though not full grown, it is linearly double the size of the Honolulu specimens, and is besides a 

 solitary representative, I have thought it better to leave it out of account. 



10. Odostomia oodes? n. sp. (PI. XXXI. fig. 6). 



September 8, 1874. Flinders Passage, Cape York, North-east Australia. 7 fathoms. 



Shell. — Small, oval, ribbed, %ubscalar, with a blunt sub-obliquely truncated top, an 

 inturned tip, a slightly impressed suture, a shortly produced and rounded base, and a small 

 mouth. Sculpture: Longitudinals — there are on the last whorl about 20 slightly curved 

 rounded ribs, parted by shallow rounded furrows of about the same breadth as the 

 ribs ; they extend to the very centre of the base ; there are fewer of these on the earlier 

 whorls. Spirals — in the furrows between the ribs the whole surface is scored with fine 

 threads and furrows. Colour porcellanous white. Spire short, subscalar, and with con- 

 vexly conical outlines. Apex : the shell terminates abruptly in a sub-oblique line, the 

 top being depressed and the extreme tip inverted ; the first whorl and a half are smooth 

 or at least ribless. Whorls 5 in all, short, a little convex ; the last slightly tumid, with 



1 Hence the name. 2 wMm, oval. 



