232 Mr. W. E. Iloyle on the 



umbrella extends about halfway up the dorsal arms and one 

 fourth up the ventral arms, its extent being intermediate 

 between these extremes in the case of the other arms. The 

 suckers are round and prominent, and in many cases show a 

 double margin, due to a thin membrane surrounding the 

 thickened edge of the sucker; they commence one sucker's 

 breadth from the oral margin, and become gradually larger 

 and wider apart as far as the middle of the arm, where they 

 are one sucker's breadth apart, after which they are smaller 

 and closer, and towards the extremity stand in contact. 

 There is no trace of a hectocotylus. 



The Surface of the body appears to have been perfectly 

 smooth ; it is covered with torn remains of epithelium, but 

 there are neither warts nor cirri. 



The Colour is a pale yellowish grey, and there are numerous 

 reddish-brown chromatophores. 



Hab. Off the Rio San Francisco, Brazil (Station 125), 

 probably surface. One mutilated specimen, sex? 



Japetella diajjhana, n. sp. 



The Body is gelatinous and semitransparent ; it is ovoid 

 in form and considerably longer than broad. The mantle- 

 opening is very wide, extending up behind the eyes on either 

 side. The siphon extends two thirds of the distance to the 

 umbrella-margin, and is truncated at the extremity. There is 

 a median septum in the branchial cavity. 



The Head is nearly as broad as the body, and the eyes are 

 large and prominent; they consist of a larger darkly pig- 

 mented spheroid, from which protrudes the smaller opaque 

 white spherical lens. 



The Arms are unequal ; the longest (the third pair) are 

 almost as long as the body and are nearly twice as long as 

 the fourth, which are the shortest, the order of length being 

 3, 2, 1, 4; they taper rapidly to fine points. The umbrella 

 is very small, extending about one fourth up the dorsal and 

 ventral arms, a little further up the dorso-lateral and lateral 

 arms, and being least developed in the space between the 

 ventral and ventro-lateral arms. The suckers have assumed, 

 owing to shrinking, a quadrangular or triangular form ; they 

 are prominent and marked by two constrictions, one at the 

 base, separating them from the arm, the other rather more 

 than halfway up. There is no trace of any hectocotylus. 



The Surface appears to have been smooth originally, but 

 the epithelium has been to a great extent stripped off. 



The Colour is a very pale yellowish grey, marked with 

 numerous longitudinally disposed oblong chromatophores. 



