CEPHALOPODS OF WESTERN NORTH AMERICA. 



281 



Odcpus fiunclalus Kelsey, 1907. P- 45 (listed from San Diceo). 



Baily. 1907. p. gs (listed from La Jolla). 

 Polypus punciatus Hoyle, 1909, p. :6o (no description). 



Wiilker, 1910. p. 7 (Japanese specimens). 



Keep, 1910. p. !96 (no description). 

 Polypus hoKifkonyensis Beiry, 1911a, p. 302. 



Animal " most commonly of rather moderate size but sometimes attaining enormous dimensions: 

 customarily littoral in habit. Body pyriform to subglobose, usually broadest behind, length and 

 extreme breadth about the same . Opening of mantle cavity of moderate width , reaching on either side 

 to a point about midway between the base of the funnel and the ocular aperture. 



Head rather small, separated from the body by a slight constriction. Eyes fairly prominent. Fun- 

 nel long and conical, its base immersed in the integument of the head, its distal half free. 



Arms of considerable stoutness and length, ordinarily at least three to four times as long as the head 

 and body taken togetlier; in general subequal, but ver>' variable, the second pair almost always slightly 

 the longest and the ventral pair apt to be the shortest. Suckers small and not very closely placed about 

 tlie mouth, alternating in a zigzag which shortly develops into two rows continuing to the tips of the arms. 

 In the region where the umbrella joins the arm the suckers reach their maximum, becoming very large, 

 flattened, and disk-like; inner surfaces prominently ornamented by about 20 more or less biftu-cating 

 radial ridges, with a lesser number of smaller and shorter ones interpolated between. The remaining 

 suckers diminish rapidly in size and become very mmute upon reaching the attenuate tips of the arms; 

 they are likewise more elevated and develop fewer radial ridges. In some of the smaller males exam- 

 ined from a number of the more southern stations (e. g. no. 156, 134, 161) from one to two suckers on a 

 part or all of the arms near the jimction of the umbrella are considerably enlarged and much elevated 

 (pi. XXXIX, fig. 3). The condition does not appear to be a constant one and may be phj^siological. 



Umbrella well developed, reaching between the lateral arms for about a quarter of their lengUi, but 

 less extensive between the dorsal arms and usually shortest of all between the ventral pair; margins of 

 the umbrella continuing as a prominent marginal web along Uie ventral surfaces of all the arms nearly 

 or quite to their tips. A similar but narrower membrane extends from the base for a little way along 

 their dorsal margins as well. 



Third right arm in tlie male hectocotylized; much shorter, stouter, and less attenuate tlian the 

 others; terminating in a rather small copulatory organ (pi. xxxix, fig. 4), the relative dimensions of 

 which may best be seen by a glance at Uie following table giving tlie measurements of 13 of the 

 specimens examined. ^ 



Rei,ative Dimensions of Specimens op Polypus hongkongensis. 



Author's rCE- 

 ister no. 



142. 

 MS- 

 162. 

 162. 

 156. 

 151. 

 146. 

 158. 

 IS3. 

 161. 

 IS7. 

 134. 

 81.. 



Locality. 



Uyak Bay, Alaska 



Near Port Townsend, Wash 



...do 



....do 



do 



Point Reyes, Cal 



Monterey Bay, Cal 



do 



do 



do 



0£f San Nicolas Island. Cal 



Near San Diego. Cal 



Off Los Coronados Island. Lower California . 



Length of 



third left 



£frm. 



(?) 



(?) 

 (?) 



265 



l8s 



IS2 

 61 



I4S 

 114 

 130 



X02 

 I S3 



Length of 



third right 



arm. 



210 

 187 

 128 

 140 

 124 

 S3 

 103 

 102 

 99 

 70 

 50 



Length of 



hectocoty- 



lus. 



14 

 14 

 ■-S 



As in other Polypus the margin of the web on this arm is ctirled inward to form a tubular groove, 

 which, after nmning the whole length of the arm, terminates in a minute acutely conical papilla at the 

 base of tlie terminal organ. The remainder of tlie hectocotylus consists of a naked smooth tapering 



a Unless otherwise indicated by the wording or arrangement of the context, the description may be understood to have espe- 

 cial reference to author's number 142.3 large male from Uyak Bay. Alaska. 



' As usual X consider a certain part of the variation shown to be due to the impossibiUty of accurate measurement. 



