196 Mr. W. E. Hoyle on the 



from the margin of the body and posteriorly passes on to the 

 ventral sm-face and terminates 2 millim. from its fellow and 

 4 millim. from the extremity of the body. The mantle-margin 

 has a narrow projection over the head, and is evenly truncated 

 ventrally. The siphon is short, not reaching halfway to the 

 space between the ventral arms. 



The Head is of medium breadth, and the eyes prominent 

 laterally. 



The A7'ms are subequal, the order of length being 2, 4, 3, 

 ], and less than one third of the length of the body ; the first 

 two pairs are subconical and slender, the third broader and 

 with a web running up the ventral aspect, the fourth wider 

 and with a distinct ridge along the outer edge ; they all taper 

 to very fine points. Many of the suckers are deficient, but 

 they seem to have stood in four series throughout ; they are 

 spheroidal and very oblique ; the distal margin of many has a 

 deep notch : the horny ring is smooth in most cases, but 

 occasionally possesses a few angular teeth. The hectocotylus is 

 not developed. The umhrella is but little developed, its 

 greatest extent being on the ventro-lateral aspect, where it 

 reaches the fourth row of suckers. The buccal membrane has 

 the usual seven points^ the two ventral being the least distinct 

 (as usual in female specimens) ; the spermatic cushion is 

 small. The outer lip is narrow, the inner wide and papillate. 



The Tentacle is shorter than the body and slender; the 

 stem has three sides, the inner being slightly hollow, with a 

 slender fillet along the middle. The club is slightly expanded 

 witli a distinct protective membrane; the inner side of the 

 club is deeply grooved, and internally to the groove is a rather 

 broad fin. The suckers are in about five series ; near the inner 

 margin are three rather larger than the rest, which gradually 

 diminish towards the outer margin. The horny rings of the 

 larger suckers have about twenty fine teeth on the distal 

 semicircumference, the smaller have fewer in proportion. 



The Surface is smooth all over. 



The Colour is a dark purplish grey above, paler below. 



The Shell is a very elongated oval in outline ; the chitinous 

 margin is very narrow and extends one third over the dorsal 

 surface^ which is smooth and evenly convex, with the excep- 

 tion of a slight ridge along the middle line : the ventral sur- 

 face is elevated, so that the shell is thick, with a shallow 

 median groove becoming evanescent posteriorly ; the last 

 loculus occupies one third of the surface and is bounded by a 

 slightly curved line with a cusp where the median groove 

 meets it : the inner cone is formed by two limbs, which arise 

 halfway along the shell and form rounded fillets slightly 



