ROBSON— ON THE CEPHALOPODA 435 



Dimensions. Max. length of body (apex — base of arms), 10 mm. 

 „ width ,, „ 7 mm. 

 Length of tentacular arms, 9 mm. 



The surface of the mantle is smooth, semi-transparent, and of a faint ochreous colour. 

 A number of small dark-red chromatophores are found dorsally scattered sparsely over the 

 posterior half and disappearing anteriorly and ventrally. A couple of chromatophores 

 appear in a dorsal position on the head, one on each side of the median line. 



The body is saccular and rounded posteriorly, where, in a subterminal position, a pair 

 of small quadrate fins appear on the back. 



The funnel is large and projects more than 2 mm. beyond the edge of the mantle. 



The sessile arms exhibit the formula 3. 4. 2. 1. 



The tentacular ai^ms. Only one of them is complete. They are solid, truncheon- 

 like structures for more than 2"5 mm. of their length, after which they rapidly taper to a 

 very fine strand continued to the " club " which is 2 mm. long and well developed. 



The lateral and admedian cartilaginous rows are furnished with numerous pyramidal 

 tubercles. There are no median dorsal cartilaginous tubercles as in L. reinhardti. 



The mandibles (cf Text-fig. 1). 



The radula. The admedian lateral tooth is enlarged so as almost to match the second 

 lateral in size. There would appear to be no small marginal tooth, though it is impossible 

 to be certain of this point. 



Type in the Zoological Dept. British Museum. 



Cranchiidse. S.-fam. ii. Taoniinse. 



Taonidium, sp. 



A damaged example, sex indeterminate, juvenile, "16:5 :05," from 125 fathoms (1534). 

 Possibly referable to T. suhmii (Hoyle). 



Family Polypodidse. Scaeurgus. 



Scaeurgus unicirrhus Tiberi. (Plate 66, fig- 2.) Bull. Soc. Malac. Ital. 1880, p. 5 

 (after Delle Chiaje, n. n.). 



One example, ?, from 123 fms. S. de Malha (1406). 

 $> „ 125 „ „ (1404). 



Distribution previously known : Mediterranean region. 



The examples are unmistakably representatives of this species, which as far as the 

 author has been able to satisfy himself, has never been previously recorded E. of the 

 Mediterranean area. 



It is desirable to add some further notes to the already existing knowledge of the 

 anatomy of this form. One or two points appear to be of considerable importance. 



To the description of the hectocotylus given by Jatta (9) we may add the fact that 

 there is no communication between the main sperm-path (the marginal sulcus) and the deep 

 cleft at the extremity of the hectocotylus described by Jatta (p. 237). The function of 

 this cleft is therefore somewhat difficult to understand, unless we assume that the whole 

 extremity is applied as a sucker for prehensile purposes. 



