1912.] NATURAL SCIENCES OF PHILADELPHIA. 415 



attachment as far as the mantle margin; posterior lobe scarcely 

 developed; nearly median in position, the plane of attachment 

 nearly level with the dorsal surface of the mantle. 



Head very large, as broad as the body, flattened above, excavated 

 beneath. Eyes large with rather large openings; the right eye- 

 lid appears to be free all round, the left eye has only the lower lid 

 free. Funnel rather small, flexed upward so as to lie closely in the 

 excavation formed by the hollowed under surface of the head. A 

 slight curved longitudinal groove with a raised and reflexed edge, 

 situated on either side of the funnel quite far back, articulates with 

 a corresponding ridge on the inner surface of the mantle ; the ridge 

 similarly curved, rather heavy, and notably longer than the groove. 

 "Olfactory organ" situated on the same level with the lower eyelid 

 and just behind it. 



Arms stout, thick, flesh}', and rather short, the order Df length 

 2, 1, 3, 4, only the ventral arms noticeably shorter than the others; 

 each with two rows of spherical short-pediceled suckers extending 

 for their entire length. Both dorsal arms hectocotylized ; squarish, 

 prominently keeled above, unequal, the right slightly the larger; 

 much swollen; suckers very small, even at the base of the arms, 

 whence they gradually diminish in size toward the tip, the two 

 rows very regularly alternating; inner surface of each arm curiously 

 striate with numerous fine transverse corrugations arranged more 

 or less in bands to correspond with the bases of the sucker pedicels. 

 Suckers of the second pair of arms slightly larger, but still quite small, 

 excepting some five pairs along the middle of the arm which are 

 conspicuously larger than the rest; third pair similar in structure 

 to the second pair; ventral arms shorter and more slender than the 

 others, their suckers mainly lost in the specimen examined. The 

 pedicels of all the suckers, especially the enlarged ones, are very 

 brittle and delicate. Openings of suckers very small; horny rings 

 smooth. Arms connected at the extreme base by a poorly developed 

 web or umbrella which is totally lacking between the ventral pair; 

 dorsal arms laterally angled and with a dorsal keel; in the second 

 pair angles and keel become obsolete, .but reappear again in the 

 third pair; ventral arms keeled along the outer side. 



Tentacles stout and fleshy; about as long as the mantle; the club 

 furnished with a membranous keel, but otherwise not exceeding 

 the stalk in diameter; suckers extremely minute, subequal, irregu- 

 larly arranged in at least 12 (perhaps as many as 16) rows, giving 

 the club a velvety appearance; peduncles slender; the horny rings 



