MOLLTTSCA OP THE ' CHAXI-El>r(JEE ' EXPEDITIOJJ". 367 



threads. Colour porcellaneous "white. Spire high, scalar, 

 conical. Apex a blunt little cone of 3^ depressed rounded 

 whorls, out of which the minute tip just rises into view; 

 the last of these embryouic whorls is keeled. Whorls 9|, 

 with a flat horizontal shoulder, from which the higher whorl 

 rises like a C3'lindrical tower ; at the outer edge of the 

 shoulder the whorls are sharply angled ; they are all very short ; 

 and the last, which is small, has a very truncate rounded base. 

 Suture marginated and very flexuous in consequence of the 

 tubercles on the margin. Mouth round, patulous, bluntly pointed 

 above, prolonged across the front of the very short pillar into a 

 little round hole of a canal. Outer lip well arched, retiring, with a 

 rounded edge, and thickened both outside and in ; on the internal 

 varis there are in front a few small blunt tubercles ; round the 

 canal the edge is thickened, reverted, and emarginate. Inner lip 

 straight across the body, concave in the middle, and straight on 

 the very short pillar : the labial pad is rather narrow, thick, with 

 a raised and rounded edge ; it has a biggish tubercle near the top, 

 and 3 or 4 others, smaller, on the body and piUar, the point of which 

 is twisted and patulous, but not flanged. Operculum very small, 

 triangular or claw-shaped, being long and narrow ; the edges are 

 not serrated. H. 0*45. B. 0"23. Penultimate whorl, height 

 01. Mouth, height 0-16, breadth Oil. 



I do not know with what to compare this curiously shaped 

 species, in which the whorls, tubercled round the top, rise one 

 above the other in terraces or small towers. There is a fossil 

 species, iV^. turhinelJoides, described and figured by Prof. Seguenza 

 in his great work ' Le formazioni terziarie nella Provincia di 

 Keggio,' p. 261, pi. xvi. fig. 23, which seems to resemble it more 

 than any thing I know ; but it is markedly diff'erent in the more 

 elongated base. Mr. Marrat, in his ' Varieties of JVassa,^ p. 59, 

 no. 992, puts the ' Challenger ' species between iV". plehecula, 

 Grould, and iV^. luteola, E. Sm. 



5. Nassa agapeta, n. sp. (ayaTrriros, beloved.) 



July 29, 1874. Levuka, Piji. 12 fms. 



Shell. — Small, thin, translucent, ovate, with a short spire, a small, 

 conical, rather abrupt apex, an impressed suture, a rounded, 

 rather tumid base, and a largish snout. Sculpture. Longitu- 

 dinals — there are smooth, rounded, narrow, sinuous ribs, parted 

 by shallow rounded furrows of double their width ; they originate 

 in a row of largish tubercles close to the suture, are somewhat 



