184 Records of the Indian Museum. [Voy. VII, 
lobules. The foot is separated from the mantle border by a 
shallow groove. 
CoLORATION.—The dorsum of the mantle is now reddish 
buff with dots and blotches of purplish black; of the tubercles 
some are of the same colour asthe blotches. The lateral surface 
of the mantle is purplish black above, forming a broad longi- 
tudinal band with irregularly sinuous margins and of about 
one-third the height of the notum in width; this band. is con- 
tinuous with that of the opposite side round the anterior hood- 
like portion of the mantle; below there is another bluish black 
band with irregular margins, this is also continuous with that 
of the opposite side round the anterior end of the mantle by 
a natrower band of the same colour. The margin of the mantle 
(perinotum) is yellowish grey, with bluish black dots just below 
the band fabove. The ommatophores, lower tentacles and the 
dorsal surface of the precephalic flap are slaty blue. In life the 
colour of the dorsal surface of the mantle was probably bright 
red and the lower lateral band was probably dark blue. 
MEASUREMENTS.—The animals having contracted in different 
degrees, and having been distorted by long immersion in 
alcohol, it is very difficult to get an accurate measurement to 
be of any use afterwards. Still it was thought best to note 
down the different measurements of all the specimens so as to 
form an idea of an average dimension. The length is taken 
along the midventral line after straightening the animal but 
without stretching it. The figure thus obtained was then com- 
pared with that resulting from measuring the animal along the 
midventral line in the distorted condition, and it was seen to 
be practically -the same in both the cases. Another measure- 
ment is also taken along the keel from end to end. The 
width of the notum is taken to be the longest distance between 
the two lateral surfaces of the animal, and this is found to 
correspond generally to the junction of the anterior one-fourth 
and the posterior three-fourths of the body. The height of 
the notum is the longest perpendicular distance between the 
keel and the margin of the notum. 
The measurements are given below in a tabulate form; 
they are all taken in centimetres. 
