NOTES ON A GIGANTIC CEPHALOl'OD. 41 



collapsed and protruded, haugiug by their pi'oximal part. There were 

 thus no cornea which shut otf the cyc-cavlttj from outside. The open- 

 ings of the eyes, although somewhat damaged, could be made out to 

 have been large and to have had distinct ei/e-lids. The Lachrymal 

 sinus was very small, if present at all ; we seemed to see a slight notch 

 at the place where the sinus should have been. Length from the 

 anterior ventral mantle viargin to the base of the ventral (MJi) sessile 

 arm on the median line 19 cm. Lengtli from tJie anterior ventral 

 mantle margin to tJie middle of the mouth 29 cm. Breadth behind the 

 eyes 14 cm. 



The InfundibuluiM was united to the head by two muscular 

 bands and was provided with a valve. Length from tJie anterior 

 ventral mantle margin to tJie middle of the infundibular opening 11 cm. 

 Breadth across the opening 8 cm. 



The Sessile Akms : Bize. of these several had l)een injured 

 as mentioned before. The following gives the length and condition of 

 each arm : 



First (Dorsal) Fair : left, injured, only So cm. left ; right, 

 a small portion of tlie tip lost i.e., nearly perfect, GO an. 



Second (Upper Lateral) Pair: left, nearly perfect, 75 cm.; 

 right, nearly perfect 70 cm. 



Third (Lower Lateral) Pair : left, oitire, 87 cm. right, 

 injured 71 cm. 



Fourth (Ventral) Pair : left, entire, 122 cm.; rigid, entire, 

 117 cm. 

 It is evident from these measurements that in point of length, the 

 fourth pair stood first among the sessile arms, then came the third, 

 then the second, and finally the first, pair. The formula is thus 4, 3, 2. 

 1. Supposing that about G cm. had been lost from the tip of the right 

 arm of the first pair, it (the shortest arm) would become 72 cm. long, 

 and was shorter than the left fourth arm (the longest) by 50 cm. i.e., by 

 about two-thirds of its own length. While the first three pairs differed 

 from one another by only 10 cvi. or less, and may thus be said to have 



