162 W. Lilljeborg on the Genera Peltogaster and Liriope. 



genus : Agelacrinites. The recognized species of this genus are 

 enumerated in the annexed tabular view : — 



Subkingdom RADIATA. 



Class ECHINODERMATA. Order THYROIDEA. 



Fam. Agelacrinitidse. 



Genus Agelacrinites. 



Synopsis of Species. 



A. — Lower Silurian Species. 

 (Rays curved) : — 



1. A. BuchianuSy E. Forbes. 



2. A, Cincinnatiensis, Roemer. 



3. A, Dicksoni, Billings. 



4. A. (Edrioaster) Bigsbyi, Billings. 

 (Rays straight) : — 



5. A. Bohemicus, Roemer. 



6. A. Billingsii, Chapman. 

 B. — Upper Silurian Species. 



(Rays straight) : — 



7. A. parasiticus, Hall. 

 C. — Devonian Species. 



(Rays curved) : — 



8. A. Hamiltonensisy Vanuxem. 



9. A. RhenanuSy Roemer. 

 D — Carboniferous Species. 



(Rays curved) : — 



10. A. KaskaskiensiSy Hall. 



XXV. — On the Genera Peltogaster and Liriope of Rathke. 

 By W. Lilljeborg. 

 [With a Plate.] 

 Professor Lilljeborg of Upsal has published, in the ' Trans- 

 actions of the Royal Academy of Sciences' of that place, a 

 memoir containing detailed descriptions of the animals to which 

 the above generic appellations were given by Rathke. As it 

 forms an interesting supplement to the memoirs by Steenstrup 

 and Leuckart which have already appeared in this Journal*, we 

 here give an abstract of its contents. 



In the historical portion of his memoir, the author goes over 

 the same ground as his predecessors ; so that there is no occa- 



* See Ann. Nat. Hist. 2nd ser. vol. xvi. p. 153, and 3rd ser. vol. iv. 

 p. 422. 



