REPORT ON THE CEPHALOPODA. 57 



thickest about two-thirds the distance from their base, and terminate in a delicate 

 slender tip, which projects beyond the web. The umbrella is a thin delicate mem- 

 brane, very largely developed, and when fully expanded probably forming a cup nearly 

 three times as large in diameter as in depth. It extends from the tip of the ventral arm 

 on either side backwards, and becomes gradually narrower, so that it only extends along 

 the proximal two-thirds of the next arm, and passes beneath it to be attached in a 

 crescentic line to the outer surface of the web, which similarly passes backwards from 

 the tip of this (PL XII. fig. 1) : this condition is usually described by saying that the 

 arm does not lie in the umbrella for the proximal two-thirds of its length, but is joined 

 to it by a vertical or " intermediate " web, but this does not so correctly represent the 

 arrangement. The umbrella stretches across from tip to tip of the two dorsal arms, and 

 between the proximal two-thirds of the two ventral arms (see woodcut 2). The web is 

 thickened but not indurated where it is attached to the ventral aspect of the arms. The 

 suckers commence about 1 cm. from the oral margin, and the first four lie pretty close 

 together within a space of less than 2 cm., after which they gradually become further 

 separated, an interval of 2-3 cm. intervening between each two ; about two-thirds along 

 the arm they stand closer together, and are very large, but after this they again become 

 smaller, and stand in close contiguity with each other. The proximal suckers are small, 

 prominent, and rather soft, and seem to contract by folding the lateral margins over 

 towards each other, so as to present the appearance of a half-closed eyelid ; the largest 

 suckers are firm and muscular, and consist of a hollow globular basal portion imbedded 

 in the arm and a short cylindrical or conical projecting portion. They are divided inter- 

 nally also into two parts, the outer being a shallow cup leading by a narrow aperture 

 into a rounded cavity below. The cirri commence between the fourth and fifth suckers 

 as very minute prominences, which gradually increase in length until halfway along 

 the arm they attain a maximum length of 8 cm., after which they decrease rapidly, 

 and cease opposite the attachment of the web to the ventral aspect of the arm. 



The Surface of the body has been entirely denuded of epidermis, so that it is 

 impossible to ascertain its nature ; the web is perfectly smooth. 



The Colour, so far as preserved, is a dull madder ; an entry in v. Willemoes-Suhra's 

 manuscript journal states that it was " rose" when captured. 



The Jems are shown in PL XII. figs. 6, 7. 



(ZOOL. CHAiL. EXP. — PAET XLIV. 1886.) ^^ ^ 



