2 GO THE VOYAGE OF H.M.S. CHALLENGER. 



particular to Valuta crenulata, Lam. (see Edwards, .p. 154, pi. xx. fig. 1); but while diminishing some 

 features of distinction dwelt on by these authors, they sp strongly develop others, that the difference 

 between the living and the fossil species stands out more strongly than ever. The size and form 

 are, indeed, so utterly dissimilar, as at once to constitute a marked distinction. At the same time, 

 the species does interestingly represent the older forms, in shape and sculpture recalling Voluta 

 digitalina, Lam., Voluta crenulata, Lam., and Voluta elevata, Sow., perhaps in particular ; the 

 thickening and toothing of the outer lip resembles exactly that of Voluta luctatrix, Solander, and 

 Voluta ambigua, Sol., while the toothing of the pillar is like that of Voluta nodosa, Sow. Of course 

 whatever generic value " Volutilithes " of Swainson may have, Adams's definition of the genus as 

 having a " columella with numerous faint rudimentary or obsolete plaits ; outer lip thin, simple," 

 must be modified. It never suited more than one or two of the fossil species, perhaps not even 

 these ; it proves inaccurate for the one living representative of the group except in its immature 

 state. 



2. Provocator, Watson, 1881. 



Provocator, Watson, Prelim. Eeport, p't. 12, Journ. Linn. Soc. Lond., voL xvi. p. 329. 



Shell smooth, fusiform ; having the apex of Ancillaria, the enamelled suture of Bullia, 

 the pillar-folds of Voluta, and the sinus of Pleurotoma. 



I believe this very curious form to be essentially a Volute, in which genus the group of Cymbium 

 and forms like Voluta scapha, Gm., Voluta imperialis, Lam., and many others present the sutural 

 sinus, while Zidona has the enamelled spire. The name of Challcngeria being preoccupied, I have 

 been obliged to reproduce it as I could in Latin. 



Provocator pulcher, Watson (PL XIII. fig. 5). 



Provocator pulcher, "Watson, Prelim. Report, pt. 12, Journ. Linn. Soc. Lond., vol. xvi. p. 330. 



Station 149j. January 29, 1874. Lat. 48° 43' S., long. 69° 15' E. Off Cumberland 

 Bay, Kerguelen. 105 fathoms. Volcanic mud. 



Station 150. February 2, 1874. Lat. 52° 4' S., long. 71° 22' E. Between Kerguelen 

 and Heard Islands. 150 fathoms. Coarse gravel. Bottom temperature 35 - 2° F. 



Shell. — Smooth, fusiform, rather thin, with a high, sharp, slightly enamelled apex, a 

 contracted and elongated base, a straight two-toothed pillar, a large mouth, a prominent 

 'angulated and patulous outer lip, and a strongly marked sinus at the enamelled suture. 

 Sculpture : Longitudinals — the smooth surface is scored with fine hair-like flexuous lines 

 of growth. Spirals — there are some lines in the substance of the shell which are best 

 recognised without a lens : there are also some irregular white lines connected with some 

 slight thickening of the glaze ; below the scar of the sutural sinus is an obsolete angula- 

 tion. Besides all this, the surface of the enamel of the shell is obsoletely tubercled 



