REPORT ON THE CRINOIDEA. 53 



Bohlsche, Pourtales, Grube, Bell and others, so far as my knowledge of them extends. 

 A few of my own undescribed species, from the " Blake " collection and elsewhere, are 

 also added, as they have received names somewhat prematurely, owing to their being the 

 hosts of Myzostomida, which have been described by Professor von Graff. One or 

 two of Professor Liitken's MS. names are included, as they belong to easily recognisable 

 types, e.g., Antedon protecta ; but others, such as Actinometra mutabilis and Actinometra 

 trachygaster, are omitted, as I have found a considerable variety of types under each of 

 these names in the different collections that I have examined. 



I have added a few remarks respecting the absence of certain well-known names, 

 such as Antedon sarsii and Actinometra timorensis, and also with regard to the 

 presence of certain species in altogether different groups, both specific and generic, from 

 those to which they have been referred by their original describers — (See the numbers 

 before the names). 



In order to exhibit more completely the range of structural variation which is to be 

 met with among the Comatuke, I have included the formulae for various species that I 

 have examined but have not j^et described. Some rather variable species appear in more 

 than one group, 1 and to draw attention to their peculiarities the name is followed in 

 each case by the formula of the other group in which the species also occurs. Thus 



Actinometra pulchella (10), 2 and (2.(2).^- 



In one or two cases I have departed from the strict numerical sequence in order to 

 avoid separating too widely species which are really very closely allied, on the sole 



ground that one has an axillary more than the other. Thus A. 3. ^-jp immediately 

 succeeds A^y, while a.3.2(p.br) and a.3.2(p,p',br) follow most naturally directly 



after a.3.2.6r., instead of being separated from the latter group by several inter- 

 vening ones, as was the case in my preliminary list. 3 



List of Species. 



Genus ANTEDON. 

 I. A.R.2.2.2. 



A.R.3.2.(2). 1. elegans 



A.R.3.3.3. midtiradiata 



A. R. 3. 3. 3. 3. 2. microdiscus 



'It has not been worth while to repeat the name in one or two cases, e.g., Antedon elegans (A.R.3.2.(2)), and I 

 have therefore used brackets for the last figure. 



2 The 10 is not used here to indicate that there are ten joints in the distichal series, but as a short way of 

 denoting the presence of only ten arms. I trust that the abbreviation will not be misunderstood. See p. 47. 



3 Proc. Zool. Soc. Lond., 1882, pp. 746, 747. 



