Behry. — Cephalopods from the Ktrwadec Islands. 



139 



Measurements. 

 Total length 



Dorsal length, of mantle, excluding web 

 Dorsal length of mantle, including web 

 Width of mantle, excluding web 

 Maximum width of web 

 Width of neck 

 Width of head 

 Length of funnel . . 

 Length of right dorsal arm 

 Length of left dorsal arm 

 Length of right second arm 

 Length of left second arm 

 Length of right third arm 

 Length of left third arm 

 Length of right ventral arm 

 Length of left ventral arm . 

 Length of umbrella between dorsal arms 

 Length of umbrella between ventral arms 



mm. 

 250 



43 



50 



20 

 9 



10 



17 



18 

 172 

 181 

 151 

 150 

 114 

 127 



91 + 

 127 



28 



18 



The only specimen seen is a small female (S.S.B. 399). Nevertheless, 

 it presents so remarkable a combination of characters that there seems 

 little risk in describing it as new. It necessarily recalls the Pinnocotopus 

 cordiformis (Quoy and Gaimard) of New Zealand, but in that species the 

 body is said to be tuberculated, and the arms are of nearly equal length. 

 Moreover, the. Kermadec specimen possesses no trace of the conspicuous 

 blue lunulations along the arms as described for P. cordiformis — in fact, 

 seems to have very little in common with the latter species save the re- 

 markable development of the peripheral fo'd. In the smooth elongate 

 body and predominating dorsal arms it approaches very closely the con- 

 dition found in P. macropus (Risso), and this may prove something more 

 than a mere coincidence. 



Polypus sp. (young). 



Two very juvenile Polypi in the collection (S.B.B. 404) may possibly 

 represent young stages of P. kermadecensis. They are characterized by 

 their very slender arms, and elongate light-coloured body terminating 

 posteriorly in a sort of papilla, thus strongly recalling young specimens 

 of P. macropus and perhaps P. ornatus of similar size. They lack the peri- 

 pheral fold. 



Fam. ONYCHOTEUTHIDAE Gray, 1849. 



Genus Onychoteuthis Lichtenstein, 1818. 



Onychoteuthis banksii (Lea°h, 1817) Ferussac, 1826. 



Loligo banskii Lsach, 1817, p. 141. Onychoteuthis bxnskii Ferussac 

 ind'Orbigny, 1826, p. 151. 



The collection contains one adult and live immature specimens of this 

 widely distributed species (S.S.B. 401). The right tentacle-club of the 

 largest spec'men has 10 hooks in the dorsal row and 11 in the smaller ventral 

 row, the basalmost hook in this row being conspicuously larger than the 

 others. There are 8 suckers and 7 pads in the fixing- apparatus. The 

 left tentacle-c'ub of the second largest specimen has 11 hooks in the dorsal 

 row, 10 hooks in the. ventral row, and 9 suckers and 5 pads in the fixing- 

 .apparatus. The other tentacle-club in each case is missing. 



