140 



THE VOYAGE OF H.M.S. CHALLENGER. 



wliat flattened. The chib (PI. XXI. fig. 13) is flattened and expanded ; along its outer 

 margin is a very narrow membrane, and along the median edge, at some distance from th e 

 cupules, is a broad web, marked on the dorsal aspect with fine parallel shallow oblique 

 grooves ; along one margin it bears three or four series of small pedunculate sucJcei^s, 

 whose horny rings bear very numerous and acute teeth. 



TJie Surface is smooth. 



The Colour is a dull purplish grey above, ochre with purple chromatophores below. 



The Jaivs are shown in figs. 18, 19. 



The Shell (figs. 14-16) has a narrow elongated oval oziiZme, somewhat pointed in front 

 and tapering gradually backwards ; the chitinous margin is uncovered over about one- 

 third of the dorsal surface, which shows the boundary lines of the loculi clearly as brown 

 strise, and is very minutely roughened ; the ventral surface is elevated, so that the shell is 

 thick in proportion to its breadth, a narrow groove runs down the centre ; the last loculus 

 has an index of 28 "3 in the male and 30 "5 in the female, and is bounded posteriorly by A 

 shallow open curve. The posterior extremity is a very flattened irregular cone, to the 

 apex of which the spine is attached ; the inner cone is very shallow and its opening is 

 some 4 mm. distant from the margin of the outer cone. The spine is loDg, straight, and 

 points directly backward. 



Dimensions} 



Length, total, ..... 









177 mm. 



End of body to mantle-margin, . 









60 „ 



End of body to eye, .... 









62 „ 



Breadth of body, .... 









27 „ 



Breadth of head, 









19-5 „ 



Eye to edge of umbrella, 









9 „ 



Breadth of fin, . . ■ . 









3 „ 



Diameter of largest sucker on sessile arm, 









0-6 „ 



Diameter of largest sucker on tentacle, . 









0-25,, 



Length of the shell. 









60 „ 



Breadth of the shell. 









12-5 „ 



Eight. Left. 



Length of first arm,^ ....... 35 mm. 25 mm 



Length of second arm, .... 







31 „ 25 „ 



Length of third arm, .... 







28 „ 28 „ 



Length of fourth arm, .... 







28 „ 27 „ 



Length of tentacle, .... 









30 „ 115 „ 



This species resembles Sepia andreana, Steenstrup, from Hako Dadi, Japan, very 

 closely in the form of the shell, which, however, is here a little thicker and broader in 

 proportion to its length ; in both, too, the ventral and third arms have a strong keel ; 

 the suckers are in four series except a varying number (two to four rows) at the 



1 Of the male specimen. In one of the females the shell is 59 mm. long and 13 mm. broad. 



2 The lengths of the arms are measured from the eye. 



