48 
var. bihamatifera, agree in all prineipal points with our arctie speci- 
men. There is much probability that they are identical. 
As regards the arrangement of the spieules I refer to Sars!). I 
have observed five forms of spieules: 
1°. (tr?.) ac. (f.) [figg. 105 and 106]. 
2°. tr®. ac. [fig. 107] nearly always bent; point never very sharp; 
3°. rut. rut. [figg. 111 and 112] curious by she extreme short- 
ness of the shaft. Varying in size. 
4°. rut. rut. NB..[figg. 109 and 110]. These spicules have a very 
remarkable shape. It is not easy to find out the real shape, but I 
now believe that they are to be considered as Esperia-anchorates, 
where all the teeth are fully developped, and not two with one 
rudimentary. The other, extremity of these anchors shows three or 
four teeth. I confess that further examination on this point is 
very necessary; but for this more material is required. 
5°. cn [fig. 108] in innumerable number on the upper surface. 
1) Sars, On some remarkable forms of arimal life ete. 1872. pag. 69, 
er ir 
