1 82 S. STILLMAN BERRY. 



paired gastric and unpaired axial organs is founded upon a good 

 morphological as well as merely topographical basis, but at the 

 same time it is impossible to emphasize too strongly that we are 

 here dealing primarily with the mere somatic distribution of the 

 organs, and not with a true genetic classification based on the 

 embryology or finer anatomy, save where the latter becomes 

 incidentally involved. The need for this qualification has no 

 doubt already been patent to the reader from the foregoing dis- 

 cussion. 



Of the dozen genera listed in the synopsis as possessing intra- 

 pallial photophores, only Heleroteulhis , Sepiola, Eiiprymna, 

 Chiroteuthis and Corynomma" are described as having anal organs 

 only, a single pair or organ formed by the fusion of a pair being 

 present in each instance. Lampadioteuthis has paired anal and 

 branchial organs (the latter very large) and a single posterior 

 axial organ. Pterygioteuthis has paired anal and branchial 

 organs, and four axial organs, the most anterior of which is vastly 

 the largest, the most posterior very minute and pushed far down 

 past the fins into the sharp-pointed tip of the body. Pyro- 

 teuthis has a quite similar illumination system, but the foremost 

 axial organ is more anterior in position, is only a little larger than 

 the others, and is flanked on each side by a small gastric organ. 

 Lycoteuthis and Nematolampas have a single pair each of anal, 

 branchial and gastric organs as above, a small anterior axial 

 and a very large posterior axial organ. Branchial, gastric and 

 anterior axial organs are placed at about the same transverse 

 plane so that they form a belt of fiery jewels near the middle of 

 the body. Onychoteuthis (banksii) is unique in having but two 

 large unpaired photophores, both of which are intrapallial and 

 lie upon the ink sac in the median line, one very large and en- 

 sconced in a specially constructed depression on the ink sac 

 proper, the smaller upon the narrow, neck like, anterior portion 

 of the sac. 



The minute unpaired organs which have been mentioned as 

 occurring in the spine-like tip of the body in Pterygioteuthis 

 and Pyrotheuthis are probably correctly interpreted as but the 

 terminal members of an unusually developed axial series. Lo- 



17 Chun rather doubtfully adds Octopodoteuthis to this list. 



