246 Transactions. 



Cape of Good Hope, attains a length of 15 in.* But this species 

 differs from mine in the proportions of the parts. 



The " Report of the ' Challenger ' " Heteropods did not enable 

 me to carry the matter further ; but my friend Mr. Charles 

 Hedley, of the Australian Museum, to whom I applied for in- 

 formation on the matter, most kindly loaned me his copy of 

 Vayssiere's ;t Mollusques Heteropodes."f From a comparison 

 of the account and figures of F. coronata contained therein I 

 think there is little doubt but that the present specimen is either 

 that or a closely allied species. My only reason for doubt is 

 a small difference in the detailed structure of the median teeth 

 of the radula. Vayssiere remarks (p. 37) that the form of the 

 median teeth constitutes the most reliable character for dis- 

 tinguishing the different species of the genus. But, in spite 

 of the small difference to which I refer, I refrain, in the absence 

 of an entire specimen, from creating a new species. 



In the Mediterranean specimens of F. coronata the median 

 denticle of the median tooth of the radula is trifid ; in the 

 Pacific specimen this denticle is, throughout the radula, single- 

 pointed (see Plate XL1II, fig. 2). I note the same asymmetry 

 of the smaller denticulations as he figures (pi. iii, fig. 36), 

 though these are rather fewer in number than he gives ; and 

 in all other respects — such as shape, proportions of median 

 tooth and of its denticulated area — this tooth agrees with 

 Vayssiere's account and figures, as do the other teeth. 



There are twenty-one or twenty-two rows of teeth (Vayssiere 

 gives twenty-three). Possibly the tip of the radula was torn 

 in my specimen, as the buccal mass was ruptured, and pro- 

 truded from the head, and probably for this reason I was 

 unable to find the " palatal chitinous hooklets " which Vays- 

 siere describes. Although there are no " thorn-like " pro- 

 cesses remaining on the body, as in F. coronata, yet they persist 

 on the head, where there are two parallel rows of four, as de- 

 scribed for that species, and below the gills. 



The following measurements were taken shortly after the 

 animal had been placed in formalin. 



Body. — Total length, probably 320 mm. : length from pre- 

 ocular " thorns " to broken surface of visceral hump. 230 mm. : 

 vertical diameter about midway between ventral fin and base 

 of snout, 30 mm. ; circumference of ditto, 90 mm. ; distance 

 from base of fin to base of snout, 100 mm. ; distance from 

 base of fin to level of genital pore, 60 mm. 



* Voy. tie Coquille, p. 249, pi. iii, fig. 1. 



t Vayssiere, .Moll. Heteropodes, 1904 (pt. 20 of " Les Resultats des 

 Campaignes Scientifiques, par Albert ler, Prince Souveraine de Monaco"). 



