BATHYPELAGIC SQUID BATHYTEUTHIS 



193 



be deteniiined by the presence or absence of this species in the IKMT 

 tows. 



While both the vertical and horizontal ranges of these two species 

 overlap to a certain extent, C. glaciaUs^ truly an Antarctic species, is 

 more limited and apparently is unable to survive in the conditions that 

 exist in the subantarctic regions. B. abyssicoJa^ on the other hand, may 

 occur together with C. glacial/s, but it possesses far greater flexibity 

 in its tolerance to different oceanographic conditions and is much more 

 broadly distributed. 



2. Brachiotenthis picta Chun, 1910 



Next in abundance is Brachioteuthis picta Chun, 1910, represented 

 by 190 si>ecimens (Table XIX, fig. 73). Specimens of BathyteiUhis 

 abyssicola taken during the same period were 3.1 times more abundant 

 than Brachioteuthis picta. The vertical ranges of the two species over- 

 lap slightly between 500-1000 m. In Brachioteuthis picta 41% of the 

 population inhabits the upper 250 m and 28% lives between 500- 

 1000 m; 80% lives between the surface and 1000 m. A rapid decrease 

 in numbers occurs below 1000 m, and the remaining 20% of the sample 

 population is spread evenly between 1000 and 2250 m. Undoubtedly 



Figure 73. — Vertical distribution by 250-meter increments of tiie total sample population of 

 Brachioteuthis picta Chun, 1910. Antarctic. 



