Onychoteuthis.\ CEPHALOPODA. 1055 



ventral row of hooks ; the pen is dark brown, lanceolate, pennate ; 

 in its middle part it has a distinct narrow web, which is not connected 

 with the spoon-shaped cone at the hinder end ; the median rib of the 

 rhachis is strongly elevated, rising into a very high and strong keel 

 behind ; anteriorly it is much more strongly cornified than the lateral 

 margins, and is clearly perceptible as a sharp dark-coloured line through 

 the integument. 



Ordinary length of body, 6 in. ( == 153 mm.). 



Teeth of Radula. -Fischer, Manuel, 343, f. 123. 



Type in the Kgl. Zool. Sarnmlimg, Berlin. 



Hob. Distribution nearly universal : all seas, in the north to 

 Hammerfest. in the south to the Strait of Magellan. Auckland ; 

 Wellington. 



Fam. HISTIOTBUTHIDJE, Pfefier. 



Body fleshy-gelatinous, epidermis thick, red with numerous chro- 

 matophores, and with luminous organs. The general aspect is that 

 of a Polypus, with a short conical body, and a large head and^brachial 

 apparatus. Fins small or of medium size, extending beyond the 

 posterior end of the body, transverse-oval with deeply notched hinder 

 end. Eyes very large, with large eye-opening, the sinus but faintly 

 indicated. Arms with cups in 2 rows. Tentacles long, three-cornered ; 

 club at the end with 4 rows of suckers, more farther down, and one 

 of them with very large cups ; fixing-apparatus on the carpal part 

 well developed. Gladius feather-like. 



Genus 1. CALLITEUTHIS, Verrill, 1880. 



Calliteuthis, Verrill, Amer. Journ. Sci. & Arts, xx, 1880. Type : (."'. re- 

 versa, Verrill. 



Body short, conical ; fins small, united behind the posterior ex- 

 tremity of body ; funnel connected with the head by 2 adductors. 

 Arms long, free, without interbrachial membrane, with 2 rows of 

 suckers. Tentacles long and thin, compressed. Horny rings of arms 

 and tentacles without teeth. Dorsal and latero-dorsal arms with 1 

 row of small and 1 row of large luminous dots ; ventro -lateral and 

 ventral arms with 3 rows of luminous organs. 



Only one species is known. 



1. Calliteuthis reversa, Verrill, 1880. Plate 66, fig. 4. 



Calliteuthis reversa, Verrill, Amer. Jourri. Sci. & Arts, xx, 188U, 393 ; 

 Ceph. N.E. Amer., 1881, 295, pi. 46, f. 1 ; Verrill, Second Catal., 1884, 

 243 ; Chall. Rep., xvi, 42, 183, pi. 33, f. 12-15. C. nrdlntn, Owen, 

 Ceph. N.E. Amer., 1881, 431. 



At Station 168 one immature specimen was taken at the surface 

 by the " Challenger," but its identification is uncertain. 



