10 T. GiSLEX, 



in A. anthus. Both in this and in the first-mentioned, newly described 

 species there are some very tender young forms with defective pinnu- 

 lation and orals not yet resorbed. I have also observed these ossicles 

 in some small Comasterid youngs and in a young Gompsometra serrata. 



Of Gharitomeiridce there are 3 species, one of them belonging to 

 a new genus, the above-mentioned Diodontometra. Moreover a new 

 species of the genus Perissometra is also described. 



The family Antedonida; counts in the collection 12 species, 

 distributed over i sub-families: 1) Antedonince : 7 species, including a 

 new one, 2) Zenometritue: one species (new), 3) Perometrince.: 2 species 

 (one new genus, the above-mentioned Glarkometra) and 4) Batymetrime.: 

 1 species. 



Gompsometra serrata as also the above-mentioned Gyllovietra 

 pulchella were brought home in great numbers and the statistical 

 investigation that 1 have carried out shows here, as almost every 

 where when one has to do with nearly fullgrown ci'inoids, an asto- 

 nishing constancy in the number of cirri, cirrals. pinnulars, etc. A 

 certain variability is, however, always visible and to establish its 

 range seems to be of rather great importance. Psatlturonietra Wireni 

 is peculiar in so far as it has sexual products on Pg, a character 

 restricted otherwise to the subfamily Bathijmetrind' or occurring excep- 

 tionally in Antedoninw. 



Of stalked Crinoids there are only representatives for the Penta- 

 crinoid genus Metacrinus, which is represented by 4 different species 

 or forms (including a new variety and a new »form»). Metacrinus Stc- 

 inarti for reasons quoted is considered to be an unimportant form-de- 

 viation from the M. rotundus type and is therefore treated as a syno- 

 nym of this species. As to M. interrupins (P. H. Carp.) I \va\o on 

 the contrary considered that there are reasons for not agreeing with 

 Mr. Sperry's views as to the identity of this species with M. rotundus 

 and I have therefore treated it as a separate species. 



The material of Metacrinus-t'ovms is extraordinarily tine and inte- 

 resting fiom an ontogenetical point of view. A young specimen of M. 

 interruptus may be the youngest known specimen of a Metacrinus spe- 

 cies and shows many interesting conditions of organisation. In a couple 

 of species it has been possible to follow the increase in the thick- 

 ness of the stem and an estimate of the total length of the grow- 



