Sepia.] CEPHALOPODA. 1059 



Measurements. -Length from anterior dorsal edge of mantle to 

 interval between fins behind, 8 in. (2004 mm.) ; from ventral edge 

 of ditto, 6 in. 7 In. (168 mm.) ; width of fins at middle, about 1 in. 

 (25 mm.) ; width of body without fins, about middle, 4| in. (113 mm.) ; 

 length of tentacular arms, 11 in. 6 In. (292 mm.) ; length of suckered 

 club, 1 in. 9 In. (42 mm.) ; longest (ventral 4th) sessile arm, 6 in. 9 In. 

 (172 mm.) ; next (third) pair, 5 in. 6 In. to 5 in. 8 In. (140 to 145 mm.) ; 

 next (second) pair, Sin. 8 In. (145mm.) ; dorsal (first) pair, 5 in. 8 In. 

 (145 mm.) ; depth of fin between dorsal pair, 1 in. 8 In. (42 mm.) ; 

 width of head, 3 in. 6 In. (90 mm.) ; longitudinal diameter of eye, 2 in. 

 (51 mm.). 



Internal Shell. Elongate-ovate, semioval anteriorly, narrower 

 posteriorly, with slight concavity of sides about one-third from pos- 

 terior end ; anterior two -thirds of midline of back nearly straight, 

 posterior third with a gentle parabolic curve downwards to edge ; spine 

 thick, very short, curved downwards or towards ventral edge, not 

 reaching beyond margin of shell ; below spine a triangular space, 

 twice as wide as deep, filled with irregular, lacunose, spiny projections 

 or lamellae, edges radiating from under base of spine ; a middle space 

 of upper surface rather more than one-third the width in front, rather 

 less than one-eighth the width at one-fourth the length from posterior 

 edge, convex ; separated from lateral, slightly convex-shaped sides 

 by two shallow diverging impressions, disappearing at posterior fourth 

 of length ; middle posterior fourth of length covered with coarse, 

 irregular, short, vermicular, tubercular ridges, the sides with striae 

 arching forwards and outwards. Margins brown aiid horny at edge, 

 calcareous farther in, narrow in front and at sides of anterior 

 half, becoming wider and forming steep sides posteriorly, united 

 behind ; a thick pad at posterior edge of hollow on ventral surface, 

 the portion of which marked with transverse undulating lines of 

 cellular growth is about four-sixths of total marginal length, flat- 

 tened behind, slightly concave in middle, and convex at sides of front 

 half ; anterior two-sixths showing greatest convexity or depth of the 

 shell at its posterior edge. 



Length from anterior to posterior edge, 5 in. 10 In. (147 mm.) ; 

 greatest width (a little in front of the middle), 2 in. 5 In. (60 mm.) ; 

 greatest depth, 7 In. (15 mm.) ; length of spine, 1-5 In. (3 mm.). 



Adult shell about 11 in. (280mm.) long, rather wider behind the 

 lateral concavities, and without spine, which is often absent in much 

 smaller specimens ; 16 sutural spaces in 6 In. (12-5 mm.) near middle 

 of underside of shell. (McCoy.) 



Type in the British Museum (sepion only ?). 



Hob. A sepion from New Brighton is in the Canterbury Museum, 

 Christchurch ; a partly broken sepion is in the Dominion Museum, 

 Wellington ; and an imperfect sepion from Tauranga is in my col- 

 lection. The type is from Australia. 



