MOLLUSCA. 



I -CEPHALOPODA. 



By W. E. Hoyle, M.A., D.Sc, The University, Manchester. 



The collection of CJephalopoda brought home by the ' Discovery ' consists of a 

 number of mandibles, many in a fragmentary condition, obtained from the stomachs of 

 seals and penguins, and one larval form. Apparently no special efforts were made to 

 collect these animals, for though the group does not seem to be richly represented in 

 the Antarctic regions, other expeditions have lirought home larger numbers. 



MANDIBLES. 



The specimens of mandibles are as follows: — (l) Stomach of Emperor Penguin, 

 January 4, 1902 [II 1.350]. Nineteen upper mandibles, apparently all belonging to 

 the same species. Eleven lower mandibles, all of one species, and most probably 

 belonging to the upper mandibles just mentioned. One upper mandible, apparently of 

 a different species, Init only fragmentary. I have not succeeded in determining the 

 systematic position of any of these, further than that they prolialjly belong to the 

 Decapoda. (2) Stomach of Lohodon carcinophaga Second [H 1349]. Three fragments 

 probably of the same species as the nineteen mentioned above. (3) Stomach of 

 Weddell's Seal, W.Q., July 24, 1902 [H 1351]. Three upper mandibles of different 

 sizes, and belonging to two, possibly three, species. The smallest is an Octopod, the 

 two larger Decapods. There is also a lower mandilJe, which appears to belong to the 

 middle-sized upper one. (4) Stomach of Seal, <J, November 10, 1902, Hut Point, 

 W.Q., 54° Oil' s., 170° 49' E. [H 1346]. A pair of moderate-sized mandibles, probably 

 belonging to an Octopod a couple of feet in total length. A pair of somewhat similar 

 mandibles, rather smaller, and probably belonging to a different species. The difference 

 in form is small, but the extent of variation of these organs within the limits of a 

 species is not yet known [H 1347]. A few fragments of very doubtful position 

 [H 1348]. 



LARVAL HISTIOTEUTHID. 



December 27, 1901 ; Lat. 54° 01^' S. ; long. 170° 49' E. [H 1345]. 

 My friend Dr. G. Pfeffer has very kindly examined this young specimen, and has 

 favoured me with some notes upon it, a translation of which is here appended : 



