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the labours of some parasitic animalculae : but on examining 

 the substance at the fractured ends, it was found exactly to 

 accord with the external surface, being composed of small, 

 crumbly, rather oblong, particles, appearing as if held to- 

 gether by an imperfect adherence. The substance of the 

 recent tubipora musica being also thus examined, was found 

 to be of the same construction. 



LAMELLATED POLYPIFERS. 



Stony polypifers, with lamellated stars, or with undu- 

 lating grooves, furnished with lamellae. 



LAMELLATED POLYPIFERS, WITH TERMINAL STARS. 



Stylina. A stony polypifer, formed of simple thick 

 masses, echinated in the upper part. Numerous cylindrical 

 fasciculated tubes, containing radiating lamellae, with a solid 

 axis : the solid styliform axes projecting beyond the tubes. 



St. echinulata. Recent, from the South Seas. 



The recent species which Lamarck considers as the type 

 of this genus, and which is the only one with which he is 

 acquainted, was brought from the South Seas by Perron 

 and Le Sueur, and furnishes us with another instance of the 

 astonishing fact of animals whose remains are found in the 

 formations containing the reliques of animals of the earliest 

 creation, no traces of which have been seen in any of the 

 subsequent formations, but which are now found in a living 

 state in the seas of the opposite hemisphere. 



Different species of this genus are found in the transition 

 limestone ; in one of these, the fossil is simple, of a turbi- 

 nated or rather of a longish clavated form, terminating at 

 its upper end in a round, lamellated star, with a projecting 

 style-like axis in the centre, PI. x. fig. 4. In another 

 species, a similar structure exists, except that instead of the 



