CEPHALOPODA. BERRY. 231 



Head large, squarish, sometimes a little narrower than the 

 Ijody, but in the best preserved material probably more often 

 a trifle wider ; bounded posteriorly by a thickened ridge, 

 -corresponding to which is a less sharply defined angulation on 

 the ventral aspect of the funnel ; " olfactory crest " com- 

 prising the usual trident-shaped fold directly back of, adjoin- 

 ing, and pointing into the just mentioned ridge. Eyes large, 

 wath large lid openings, the latter having a sharply indented 

 sinus in front (Fig. 12), at the base of which are borne little 

 flaps (the ventral one considerably the larger) interlocking 

 apparently so as to convert the apex of the sinus into a 

 pseudo-pore. Funnel short, stout, broad ; flattened, but 

 iumished \^ith the ventral elevation already described. 

 Funnel crga7i (PI. Ixvi., fig. 1) very large, comprising an 

 immense dorso-median, ^^'^^aped organ and two elongate, 

 ventro -lateral pads ; phalanges of median organ long enough 

 to jut past the lower margin of the funnel cartilages. Funnel 

 groove with a distinct foveula (PI. Ixv., fig. 1), comprising a 

 very shallow semicircular membranous fold cutting off the 

 apical portion of the groove, the excluded portion bearing 

 on its extreme apical wall a variable number (usually 6-8) 

 of low, short, longitudinal ridges. 



Arms of moderate length, fairly attenuate, their formula 

 2, 3, 4, 1, or, not infrequently, 2, 3, 1,4; the second arms, 

 which are longest, attaining about 60% the mantle length, 

 the third pair slightly less, the dorsal and ventral pairs one- 

 fifth to one-quarter shorter ; keels well developed on the 

 outer angles of all. the arms, but reaching a maximum at 

 about the basal third of the third pair ; 

 trabeculate marginal membranes also well 

 developed, but those of the third pair not 

 remarkably more than the others, except 

 those of the ventral pair which are some- 

 what less conspicuous than the rest. 

 Suckers of the sessile arms large, caldron- 

 shaped, biserial, regularly alternating ; the 

 largest probably the 6th- 7th pairs from 

 the base on the second arms, those of the 

 ventral arms smallest ; about thirty-five 

 pairs readily countable on the second 

 arm of a large d^ ; horny rings of larger 

 suckers (Figs. 13, 17, 20) smooth below, but armed on 

 their upper and lateral peripheries with a number of stout, 

 acute, triangular teeth, varying from 9 in a ? of 180 mm. 

 mantle length, to 12-13 in the larger specimens, the upper 

 median tooth distinctly larger than the others, while 



