CEPHALOPODA. — BERKY. 253 



(4) The hectocotylised arms of the d are characterised not 

 only by modifications in the size of certain of the suckers as 

 above, but (in the type species at least) by the presence of a 

 pocket-Hke gland on the outer surface of the anu.* 



Type. — The following species : — 



RossiA (Austrossia) australis, sp. nov. 

 (Plate Ixix., fig. 3-4 ; plate Ixx.) 



Body smooth, sepioliform, moderate in size ; mantle 

 widest sometimes in the middle, sometimes in front, thence 

 tapering to a rounded or round-pointed extremity. Fins 

 relatively large, attached well in front of the middle of the 

 body ; maximum length 75-90% that of the mantle, length 

 along line of attachment to body 56-66% the mantle length ; 

 in outline semicircular, evenly arcuate ; anterior lobes con- 

 spicuous, sometimes exceeding the mantle in front ; posterior 

 margins scarcely if at all indented where they join the body. 

 Mantle margin showing a slight nuchal sinuosity; it articu- 

 lates with the head by the usual nuchal cartilage (PI. Ixx., 

 fig. 3) and a pair of large, oval, very deeply grooved funnel 

 cartilages (PI. Ixx., fig. 4). 



Head large, distinctly 

 wider than the body. 

 Eyes large and prominent, 

 their lower lids free. 

 Funnel large, reaching to 



a point a little past the ^"~— -"^'^XciJ^ ^ 

 centreof the eyes; interior Fig. 'Vi.—Rossia australis '^^ [538], 

 capacious, a small flap- larae sucker from lateral arm of type ; 

 like valve near the anex ■ camera drawing from a mount in balsam. 

 FvnneJ nrnnn IV\ Ixx ' ^^^- ^"^-—Rossin australis J [530], 



^unneL organ (fl. ixx., ^^^^^^^ ^^,^^ ^^^^^ middle of third arm of 



ng. 8) comprising the paratvpe : camera drawing from a mount 

 usual large, hepatiform, in balsam. 



dorsal organ and a pair of ovate, ventre -lateral pads about two- 

 thirds the length of the former, the dorsal organ terminating 

 in a slender, sharp-pointed, median papilla in front. 



*Pfeffer (1908, p. 32) describes the sexual differences in Rossia s.s. as 

 follows (translation) : — 



" The dimorphism of the sexes is expressed b}- the suckers of the 

 2nd, 3rd, and 4th arm pairs, or sometimes (in those species with 4 rows) 

 the suckers of the outer rows of the same arm pairs, being more or less 

 greatly enlarged. Further in the true hectocotylization, which consists in 

 the basal cushions of the suckers of the outer rows on both arms of the 1st 

 pair for the proximal three-fifths of their length being somewhat elongated, 

 pressed together, and thus bringing about a pectinated appearance of that 

 part of the lateral surface of the arm ; the entire structure is more or less 

 covered by a true protective membrane (Schutzsaum), which otherwise is 

 almost entirely foreign to the family Sepiolidae." 



miT». 



