OCTINEON LINDAHLI. 463 



Octineon, from the characteristic octameral disposition of its 

 large retractor muscles." 



The animal is, therefore, Octineon (Moseley, MS.) Lin- 

 dahli (W. B. Carp.). 



As, in addition to the foregoing introduction. Professor 

 Moseley left only a description in general terms of Dr. Car- 

 penter's figures (utilised for those of the figures which have 

 been redrawn for the present paper), it will be obvious that the 

 whole investigation had to be begun afresh for a third time- 

 The difiiculties of manipulation to which Professor Moseley 

 refers proved to be considerable, the animal being too small 

 and too brittle to allow of much dissection, while the sand par- 

 ticles, which not only cover the external surface thickly, but 

 are carried deep into the body of the animal by the invagination 

 of part of the body- wall, ruin alike razor and section. 



No specimens of Octineon have been recorded besides those 

 of the "Porcupine" expedition; but Professor Lankester 

 informs me that he has dredged an organism of the same 

 appearance on the Terebratula ground beyond Capri. I for- 

 warded one of the "Porcupine" specimens to my friend Dr. 

 Paul Mayer at Naples, with the request for others in an 

 expanded condition ; but this ground is seldom visited, and the 

 search for Octineon has not as yet been successful. 



The normal form of the animal in contraction (fig. 1) 

 appears to be that of a flat disc from which a truncated cone 

 projects centrally upwards. All the specimens were in this 

 state of extreme contraction. In diameter the disc varies 

 between three and seven sixteenths of an inch, and the total 

 thickness, including the cone, varies between one and three 

 sixteenths of an inch. 



Whether from damage to the animal, or from some other 

 cause, the outline of the disc is often most irregular, and the 

 position of the cone becomes thereby excentric (figs. 3, 4, 5). 

 A few specimens are rather plano-convex and less flattened; so 

 far as I have seen, these are the specimens in which generative 

 organs are being developed. 



VOL. 35, PART 3. — NEW SER. I I 



