31G PEOEESSOR E. RAY LANKESTEE. 



(4) The sharp horny beaks placed at the entrance to the 

 mouth (fig. 2, m) are unlike the buccal armature of any mollusc 

 excepting the true cuttle-fishes. 



This Clionid-like form is then without doubt a very young 

 condition of a Dibranchiate Siphonopod. In some details it 

 presents important resemblance to the genus Cranchia. 



The genus Cranchia was founded by Leach in 1817; three 

 species are described from the Atlantic Ocean. I take the 

 following characters from ' Bronn^s Thierreich.^ The body 

 is globular^ with terminal paired fins carried on a special 

 prolongation of the body. The mantle is attached to the head 

 by a nuchal baud, and is fused on each side to the base 

 of the funnel. (A similar disposition in his young Cepha- 

 lopod accounts for Suhm^s not having detected the free edge 

 of the mantle-flap in the fresh specimens observed by him. 

 Under pressure, when mounted with a cover-glass for the 

 microscope, the mantle has become detached from the base of 

 the funnel, as represented in my drawing, fig. 2, which must 

 therefore be regarded as representing the animal in an arti- 

 ficial condition.) The head is small, with large eyes; the 

 cornea presents only a small slit. The two prehensile arms 

 are long ; the smaller arms, eight in number, very short. 

 There are two rows of suckers to the arms. The funnel is 

 long; it is devoid of attachment to the head, and without 

 internal valve. The pen extends along the whole length 

 of the back (antero-dorsal surface), and is thin, soft, small, 

 and pointed at each end. 



This description applies in most respects to the young 

 Cephalopod now in question. The differences and peculiarities 

 presented by the "Challenger" specimens are, on the one 

 hand, such as might possibly occur in the young form as com- 

 pared with the adult ; on the other hand they are more probably 

 due to the fact that we have before us a new genus allied to 

 Cranchia. 



The important peculiarities presented by Suhm^s young 

 Cephalopod are : 



(1) The pedunculation of the eyes. 



