FISHERY BULLETIN: VOL. 76, NO. 3 



Planktoteuthis lippula (Chun 1908) 



Vertical Distribution (Figure 24) 



Eighteen specimens were captured. Two cap- 

 tures between 200 and 300 m are young animals 

 that probably had not descended to the adult 

 depths. With the exception of a night capture at 

 about 625 m, the remaining animals all came from 

 depths of over 700 m. Among these deeper cap- 

 tures, there is an indication of ontogenetic de- 

 scent. The largest specimens were captured in an 

 oblique IKMT tow between 1,100 and 1,900 m. 



20 



30 40 50 60 



WANTLE LENGTH, mm 



Figure 24.— Vertical distribution of Planktoteuthis lippula. 

 Symbols as in Figure 1. 



Photosensitive Vesicles (Figure 25A) 



One set of small organs is present. Each organ is 

 attached to the ventral edge of the optic stalk and 

 consists of a few globular vesicles. 



FIGURE 25. — A. Photosensitive vesicles oiPlanktoteuthis lippu- 

 la. B. Photosensitive vesicles of Grimalditeuthis bomplandi. 

 Abbreviations as in Figure 2. 



Grimalditeuthis bomplandi (Verany 1837) 



Vertical Distribution (Figure 26A) 



Three small specimens were taken at night in 

 598 



Oi 1 1 1 1— <r-, p-V^ 



O 600 



loooo I I 



'o .j • \ 



^ \ ^ 



-i-^^ — ^-\A- 



40 50 80 300 



MANTLE LENGTH. mm 



MANTLE IE NGTH. m m 



Figure 26. — A. Vertical distribution of Grimalditeuthis 

 bomplandi . B. Vertical distribution ofMastigoteuthisfamelica. 

 Symbols as in Figure 1. 



the upper 350 m and probably are individuals that 

 had not descended from the larval depths. The 

 larger specimens were all captured during the day 

 between 750 and 1,275 m. The two largest speci- 

 mens were the two deepest captures. 



Photosensitive Vesicles (Figure 25B) 



One set of organs is present. Each organ consists 

 of a small circular cluster of vesicles attached to 

 the posteroventral margin of the optic stalk. 



Family Mastigoteuthidae 

 Mastigoteuthis famelica (Berry 1909) 



Vertical Distribution (Figure 26B) 



Excluding contaminants, 16 of 18 specimens 

 were taken between 675 and 800 m, both day and 

 night. In addition, three specimens were probably 

 contaminants. Two of these are assigned to a trawl 

 that fished at 240 m during the day. These were 

 probably captured during the previous tow at 700 

 m, which contained three specimens. Two shallow 

 night captures of small animals may indicate that 

 some of the population moves upward at night. 

 However, since specimens of 4 1 mm ML or less are 

 not far past the larval condition, these two speci- 

 mens may represent animals in transit from the 

 larval habitat. 



Photosensitive Vesicles (Figure 27A) 

 Mastigoteuthis famelica has two sets of organs. 



