ATA MOLLUSCA. 
Length of body to base of tentacles, three and a half inches; breadth, 
two inches; length of arms, dorsal, fourteen inches; upper lateral, 
eighteen inches; lower lateral, twenty inches; ventral, fifteen inches; 
diameter of largest cupules, two-fifths of an inch. 
Taken at Callao, Peru. 
The peculiarities of this species are its reticulated surface, and nar- 
row, transverse clouds of chocolate colour; its large umbrella, with 
broad membranes running up the arms; its scattered cupules, and the 
apparent possession of two pairs of eyes. Described from a figure by 
Mr. Drayton from life, and from specimens preserved in spirits. 
Figures 587, 587 a, two views of the animal, with details. 
Octopus TETRICUS (Gould). 
Corpus magnum, oblongo-ovoideum, fissura longitudinal sub-bilobatum : 
caput subquadratum, vix corpore disjunctum, rigidum: oculi parvi, 
occulti: apertura parva, crescentica: brachii robusti, abbreviati, pro 
longitudine 2, 3,4, 1; acetabulis ad brachios laterales majoribus: os 
minutum, rostris inclusis: umbella ampla: tunica plus minusve verru- 
cosa, superciliis et dorsibus brachium superiorum cirrhigerts. 
Body large, longer than broad, ovoid, with a longitudinal constric- 
tion on the under side passing round the base. Head nearly as wide 
as the body, subquadrate, compressed vertically, very rigid, with but 
a slight constriction between it and the sac. Eyes minute, nearly 
concealed. Lower aperture small, crescentic, acutely lobed at the 
centre of the lip. Siphonal tube short, conical, truncate at tip. Arms 
contorted, very robust, subquadrate, an inch in breadth at a short dis- 
tance from the mouth, comparatively short, tapering to a fine point; 
comparative length 2, 3, 4,1. Mouth very small, contracted so as 
entirely to conceal the jaws in the specimen examined. Umbrella 
large, widest from side to side, the membrane passing up the back of 
the arms two-thirds their length. Cupules very large, crowded, espe- 
cially on the lateral pair of arms, on which they are one-third longer, 
distinct quite to the tips of the arms; about eighty or ninety pairs. 
