KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 2. 35 



Of the Stem only 1.3 inni. are preserved in the most perfect specimen (Pl. I, tig. 23); 

 in this proximal portion the ossicles are low, as raany as 7 being contained in it: the 

 stem rapidly becomes quite thin. The lumen is small and round. 



No other characters are shown by the speeimens yet known. 



Notes on Angelin's figures: 



Tab. IV tig. 3 is seen from the left anterior radius, not »a latere dorsuali». The 

 arms are represented as too mucli rounded; the trigonal shape of the cup is not given, 

 the basals are wronglv drawn, the stem is incorrect, and the radial processes, though 

 obvious in the specimen, are quite absent from the drawing. 



Tal». IV fig. 3 a is a little bet ter, but the seetion of the arms is quite wrong; the 

 arms are too rounded, the relation of the anal plate to the radials is wrongly rendered, 

 and the basals are incorrectly drawn. 



Locality: Djupvik in Eksta (c) and elsewhere in Gotland, precise place not stated. 



Heterocrinid^e. 



Inadunata, Fistulata, Monoeyclica; with anal x usually resting on left upper slope 

 of right posterior super-radial, and partly on right upper slope of left posterior radial, 

 but sometimes sunk between the two, and always supporting a long ventral tube; with 5 

 arms, either diehotomous and simple or bifurcate, in the latter ease with either armlets 

 or pinnules. 



The genus Heterocrinus was first made the type of a Family by Zittel 1 ). His fani- 

 ily however included many genera now referred by me to the Decadocrinida?, by other 

 authors to the Poteriocrinida'. 



In 1886 Wachsmuth and Springer 2 ) emended this family by ejecting all Dicyclica, 

 retaining only y> Heterocrinus W. and S. non Hall = Ectenocrinus S. A. Miller, »Steno- 

 crinus» W. and S. = Heterocrinus Hall, (Hiiocrinus W. and S. = Heterocrinus Hall, pars, 

 and Iocrinus Hall. 



The genus Anomalocrinus, whieh »differs from the Heterocrinida? in the form of the 



calyx and in the arrangement of the pinnules , was made by Wachsmuth and 



Springer the type of a distinct Family Anomalocrinidae 3 ). 



Failing to see good grounds for this, in 1890 4 ) I included the following genera in 

 the Heterocrinida 1 , Iocrinus, Hall, Heterocrinus Hall non W. and S., Ectenocrinus, S. A. 

 Miller, Ohiocrinus W. and S., and Anomalocrinus M. and VY. 



To the above must now be added Herpet&crinus Salter — • Myelodactylus Hall. 

 This is the only genus of the family found in Gotland. 



1 ) Handb. cl. Palaeont., vol. I, p. 358; 1879. 



2 ) 'Revision III, (203); Proc. 188G, p. 127. 



3 ) Op. cit. III, (211); Proc. p. 135. 



4 ) »Brit. Foss. Crin.;>, Ann. Mag. Nat. Hist., ser. 6, vol. V, p. 384; May, 1890. 



