2'36 Prof. Sollas on the Structure of the 



semitransparent. The mantle adheres to the sides of the 

 siphon, so that the mantle-opening , which is single in all other 

 known Cephalopods, is here divided into two pocket-like 

 openings, which lie one beneath each eye. The siphon is very 

 long and narrow, and extends forwards anteriorly to the 

 margin of the mantle, for a distance almost equal to the length 

 of the body, and is a little swollen at the extremity. 



The Head is undistinguishable from the body except by the 

 possession of the eyes : which are situated near together on the 

 dorsal surface ; they consist of a larger basal spheroid, through 

 the walls of which pigment is clearly visible, upon which 

 stands a smaller, very prominent spheroid, white, opaque, and 

 of glistening surface. 



The Arms are equal and rather more than twice as long as 

 the body ; they are slender, and taper at first gradually and 

 then more rapidly to comparatively blunt points. The um- 

 brella extends more than two thirds up the arms, and is thin, 

 delicate, transparent, and much damaged. The suckers are firm, 

 muscular cups embedded in the softer tissue of the arms, as in 

 Girroteuthis ; there are about twelve placed at some distance 

 apart on that portion of the arm up which the web extends, 

 and eleven closely set and showing a tendency to biserial 

 arrangement on the free extremities. There are no cirri nor 

 is there any trace of the formation of a hectocotylus. 



The Surface appears to have been quite smooth originally ; 

 there is no sign of any cirri or warts. 



The Colour is a dull yellow, apparently due to preservation 

 in picric acid, and the mantle and umbrella are thickly 

 sprinkled with small brown chromatophores. 



[lab. Near the Kermadec Islands, South Pacific ; on the 

 surface (Station 171). One specimen, sex? 



XX. — Note on the Structure of the Skeleton, in the Anomo- 

 cladina. By Prof. Sollas, D.Sc, F.G.S. 



As considerable difficulty appears to exist with regard to the 

 constitution of the skeleton of the Anomocladina it may be 

 useful to publish at once a short account of the results of some 

 observations which appear to remove all doubt. Full par- 

 ticulars, with illustrations, will appear in my paper on Vetulina, 

 now in the hands of the Royal Irish Academy. 



The Anomocladina, one of the four families of Lithistid 



