214 



Waters) has taken it alive. This carries it a little farther 

 north. In September of this year Mr. Arnold, of St. Francis 

 Island, sent me a specimen in spirit which was taken alive in 

 Petrel Bay. This measures 11 cm. by 9 J cm., and has an 

 operculum measuring 44 mm. by 39 mm., and 11 mm. in its 

 thickest part. This thickest part is adjacent to the columella, 

 .and is white, while the part immediately over the depressed 

 centre of the spiral and the narrower outer edge is of a 

 cloudy-brown colour. 



From the animal I was able to get the radula, which 

 measured 40 mm. by 5 mm., and contained 76 rows of teeth. 

 The formula is 39.5.1.5.39, or, as it might more exactly be 

 written, (32.6.1) (1.4) .1. (4.1) (1.6.32). There is a central 

 tooth (pi. xxvii., fig. 6), which has a flange on each side to 

 overlap the adjacent edge of its neighbours. Each of these 

 laterals overlaps the next tooth outside. The outermost 

 lateral (fig. 4) has its upper border bent over and provided 

 with a strong cusp at its inner end. This gives it a different 

 ;appearance from all its fellows, and when the whole series 

 is seen this tooth stands out very prominently, as in pi. 

 xxvii., fig. 4. There are three kinds of teeth in the 

 marginals. The first six (fig. 2) have stout bases surmounted 

 by a bold polished cusp, and they gradually diminish in size 

 outwardly, as seen in fig. 2 in situ and in fig. 2a, when dis- 

 sected out; the three inner ones overlap the outer at their 

 bases, and otherwise lie in part behind them. The three 

 outer have not this overlapping lamina. Then follow 32 

 (approximately, varying in different rows) slightly-curved^ 

 narrow flat acicular teeth with obsoletely denticulated tops 

 (fig. 1). But there is one tooth placed immediately behind 

 the first and largest lateral, solitary, out of line with the 

 rest, and when examined in situ appearing somewhat sickle 

 shaped, as in pi. xxvii., fig. 3 ; but when separated resembling 

 the others, as in fig. 3a. I have not seen any notice of this 

 particular marginal tooth in the literature of the radula at 

 my disposal ; but I find it also in that of Turbo Gruneri. 



Pseudamycla dermestoidea, Lamarck. 



Buccinum dermestoideum, Lamarck, 1822, Hist. Nat. Anim. 

 *S. Vert., vol. vii., p. 275. 



Pyrene Mneolata, Tryon, Verco, Trans. Roy. Soc, S.A., vol. 

 xxxiv., 1910, p. 131. 



Pseudamycla dermestoidea (Lam.), Pace, Proe. Mai. Soc, 

 Lond., 1902, vol. v., pp. 255, 267. Here Pace creates a new genus, 

 Pseudamycla, for this species, which he separates from Colum- 

 bella, and of which he gives a large bibliography. At the time 

 of its publication I separated my cabinet specimens from Colum- 

 bella and put them in the new genus Pseudamycla among the 



