128 



THE VOYAGE OF H.M.S. CHALLENGER. 



inner cone commences by two limbs, which arise halfway along the striated area, curve 

 outwards, and are united below the posterior apex by a broad chitinous band passing 

 from one side of the shell to the other and forming a rather deep outer cone : the 

 spine is short (but has been broken off); it bends slightly upwards and has a narrow 

 longitudinal keel on its ventral surface. 



Dimensions. 









Length, total, ........ 90 mm. 



End of body to mantle-margin, . 









64 „ 



End of body to eye, 









60 „ 



Breadth of body, 









28 „ 



Breadth of head, 









26 „ 



Eye to edge of umbreUa, 









12 „ 



Breadth of fin, .... 









7 „ 



Diameter of largest sucker on sessile arm, 









0-75 „ 



Length of shell, .... 









64 „ 



Breadth of shell. 









22 



Eight. Left. 



Length of first arm, ....... 20 mm. 19 mm 



Length of second arm, ,. . . . 







20 „ 18 „ 



Length of third arm, ..... 







20 „ 21 „ 



Length of fourth arm, ..... 







23 „ 22 „ 



Length of tentacle, ..... 









50 „ 



This species agrees very closely with Sepia singaporensis, Pfeffer,^ as regards the soft 

 parts, but the shell is broader at the anterior extremity and the spine cannot be said to 

 be " zurlick gebogen," although it slopes gently upwards ; it is also near to Sepia 

 plangon,^ Gray, which seems, however, to be still nearer to Dr. Pfeffer's species. 



It corresponds with an unnamed shell in the Copenhagen Museum. 



The smaller specimen has the curve bounding the loculi even, not wavy, and the keel 

 upon the spine is more distinct than in the other specimen. 



1 Ceph. Hamb. Mus., p. 10, fig. 13., 



2 Sepia plangon, Gray. The type specimen in. the British Museum has the following characters ; — The body is 

 moderately long and oval in form ; the fins are very narrow but seem to have been partially destroyed ; they commence 

 about 2 mm. from the anterior edge of the body, and extend to within 2 mm. of each other behind. The mantle margin 

 extends far over the head dorsaUy, and the siphon is short. The head is rather narrow. The m-ms are about half the 

 length of the body, their order being 4, 3, 2, 1. The suckers are in four series and of medium size ; the horny rings have 

 fallen out. No heetocotyhts is present. The umbrella extends about one-fifth up the arms ; the buccal membrane has 

 the usual arrangement ; the outer lip is thin, the inner thick and papillate. The tentacles are about twice the length of 

 the body ; the club flat and expanded, and the suckers apparently in four series. The surface is smooth. The colour is 

 dark brown. The shell resembles that of Sepia singaporensis, Pfeffer, more nearly than any other known to me ; the 

 only differences being that the iucurving of the margins of the loculi in the striated area is a little more pronounced, 

 and there is a ridge or keel on the ventral surface of the spine (as in Sejiia cultrata) not recorded by Dr. Pfeffer. These 

 two species are much alike, but they differ in the arrangement of the suckers on the tentacular club. 



