PEEFACE. 



The object of the present Catalogue is to give a List of all the 

 genera and species of the family of Sea-Pens, or Pennatulariidae, 

 known to exist in the collections of Europe and America. The 

 letters B.M. after the specific names denote those species that are 

 now contained in the Collection ; and the absence of these letters 

 indicates the species which are desiderata, and therefore desirable to 

 be procured for the collection. 



These sheets were printed in October 1868, and were retained to 

 appear with the remainder of the Catalogue. 



Since the above-mentioned period, two works have been published, 

 viz.: — 



RiCHiARDi. Monografia della famiglia dei Pennatularii. 8vo. 

 Bologna, 1869. 



A. KoLLiKER. Anatomisch-systematische Beschreibung der Alcy- 

 onarien. Erste Abtheilung: Die Peunatuliden, Frank- 

 furt, 1870. 



In the latter work, some genera here proposed have been esta- 

 blished under other generic names. 



This Catalogue is the commencement of a ' Catalogue of Polypes 

 and their Corals,' of which it may be considered to be the First 

 Part. The other Parts are in preparation. 



J. E. GRAY. 



British Museum, 

 April 2, 1870. 



