MALACOZOA. CEPHALOPODA. SEPIINA, ELEDONE. 31 



SECTION II. OCTOCERATA. 

 With eight arms, but no tentacular appendages. 



GENUS 4. ELEDONE. ELEDONE. 



Head large, distinct, with eight fleshy, tapering 

 arms, furnished with a single series of acetabula on their 

 internal surface, and connected by basal membranes. 

 Body subglobose, or subelliptical, and somewhat de- 

 pressed, without natatory appendages. Mantle conti- 

 nuous behind with the skin of the head. 



1. Eledone Penndntii. Pennant's Ele done. 



Body globoso-elliptical, somewhat flattened, much rounded 

 at the end ; with the surface minutely granulated and dusky 

 on the dorsal aspect, smooth and yellowish-white on the 

 ventral ; which is also the case with the head. The mantle is 

 continuous with the head behind, anteriorly free, with the mar- 

 gin moderately thin, and even. The infundibulum conical, 

 compressed, truncate. The head very large, but narrower than 

 the body. The eyes rather small, with a circular aperture, 

 without eyelids. The arms very long, nearly equal, com- 

 pressed, tapering gradually to a fine point, for a fourth of their 

 length connected by membranes, the margins of which run 

 along the back of each arm to the end. The dorsal surface 

 of six of the arms more or less dusky the rest yellowish- white. 

 The acetabula are placed so closely that many of them, appa- 

 rently by pressure, have assumed a squarish form. They are 

 sessile, large, with a thick undulated margin, and internally 

 radiated, the larger with from twenty to twenty-five rays ; 

 the fifth or sixth acetabulum from the base largest. On one 

 of the dorsal arms are sixty-five, and on one of the ventral 

 seventy-five. The two branchiae consist each of twenty-four 

 pinnae. 



Inch. Lines. 



Length of the body 2 6 



Breadth 2 



Length from the mouth to the end of the 



body 3 6 



of dorsal arms 5 6 



,, ventral arms 6 3 



The above description is from an individual, preserved in 

 spirits, and in the possession of Dr. Dyce, who obtained it 

 in October, 1836 it having been taken in the Bay of Aber- 



