CEPHALOPODA FEOM THE CALCUTTA MUSEUM. '7 



•seem to be tlie nearest allies of this new species. Prom the former it is distinguished by 

 the lesser number of teeth on the homy rings of the arm and tentacular suckers, by the 

 presence of suckers on the buccal membrane, and by the undulation of the olfactory 

 ■.crest (?). From the latter, S. maurltiana, it is distinguished by the lesser number of 

 teeth on the horny ring of the slickers and by the sliape of the pen. 



LOLIGO INDICA, Pfeffer. (PI. 2. figs. 20, 21, 22, 23, 24, 25, 26, 27, & 28.) 



To this species arc referred eight specimens from Mergui, one from Camorta Harbour, 



one from Daley Sandheads (1887), and two from the mouth of the Mutlah River; also, 



with some hesitation, a large female from the Ohilka Bight. 



The first 12 specimens differ little in size ; below are the measurements of a male and 



of the large female mentioned above : — 



6- ?• 



ecntim. ceutim. 



Length of mantle (npper surface) 9"1 14 



Breadth „ at beginning of tins .... \Q 3 



Length of fin-attachment 5 7"6 



Breadth of fins combined -i'S 7"65 



Length of pen of a smaller ^ , 6'6 centira., breadth ] -2 centim. 

 „ „ the large 2 , li centim., breadth 2-7 ceutim. 



I feel obliged to go into some detail concerning this species, since the figures and 

 descriptions published by Mr. Hoyle of the ' Challenger ' specimens (i) differ widely from 

 Dr. Pfeffer's original description (6). 



Concerning the horny ring of the suckers of the arms, Pfeffer says, " Armringe mit 6 

 ziemlich grad viereckigen Zabnen ; darauf folgt die erhabene Leistc, die vorn nocli 

 jederseits cine Einkerbung als Paxdiment eines Zahnes zeigt." This hardly agrees with 

 Hoyle's figures, but corresponds exactly to my figure of the horny ring of the female 

 (fig. 26). 



With regard to the horny ring of the suckers of the arms, I find that there is a well- 

 marked sexual difference, for in the males these rings are armed with from 9 to 11 

 rounded teeth (fig. 20). 



Again, concerning the horny ring of the tentacular suckers, Pfeffer says, " Grosse 

 Tentakelringe mit etwa 21 spitz dreieckigen Zahnen, deren Basis schmaler ist, als die 

 Zwischenraume." While this description differs much from Hoyle's figures, it agrees 

 entirely with what I find (fig. 27). iVlthough 21 is the usual number of teeth in these 

 specimens, there are sometimes as few as 15 in the large female. Pig. 24 shows the 

 horny ring armed with G strong teeth from one of the very small distal suckers of the 

 ckib ; while fig. 25 represents a portion of the horny ring from one of the suckers of the 

 apical set at the tip of the club (cfr. Sepiotetdhis, j). 0). 



The lobes of the buccal membrane are provided with small toothed suckers, the horny 

 ring of which is shown in fig. 21. I figure also a club-shaped spermatophore removed 

 from the buccal membrane (fig. 28). 



