KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:<> 2. 181 



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Explanation of the plates. 



All figures are natural size except where otherwise stated. 



Enlargeinent is denoted by the sign of a vulgär fraction placed alongside each enlarged figure, and is in all cases 

 calculated by linear measurement: thus, f signifies that the specimen has been magnified 4 diameters. 



When figures are specially alluded to in the text, a page-reference is added to the explanation. 



"When the cup is drawn either from above (actinal) or from below (abactinal), the orientation of the figure is always 

 such that the right of the auimal is on the right of the observer, so that the posterior interradius is towards the bottom 

 of the page in the former case, towards the top in the latter. 



Plate I. 



Pisocrinus (p. 22). 



P. pilula (p. 27). 



Fig. 1. Specimen figured by ANGELIN, Tab. IV, fig. 1; from r. ant. radius. Petesvik. (pp. 30, 31). 

 N. B. The swelling at the proximal end of the stem is also seen in British specimens, and is 

 probably a constant character. 



Conical form; from r. post. interradius. Petesvik. (pp. 28, 29.) 

 Ovoido-conical form, with swollen plates; from 1. ant. radius. Petesvik. (p. 28.) 

 Globose form; from post. interradius. Petesvik. (pp. 28, 29.) 

 Same specimen; globose form; from below. (pp. 28, 29.) 



Conical form; with circular horizontal section; from below. Petesvik. (pp. 28, 29.) 

 Ovoido-conical form, with trilobate horizontal section; from below. Klinteberg. (pp. 28, 29. 

 Compare Angelin, Tab. IV, fig. 4.) 



Fig. 8. Actinal surface, showing the proximal plate of the anal tube slightly separated from the r. and 

 1. post. KR, also fragments of tegminal plates. Petesvik. (p. 31.) 



N. B. It is uncertain whether the tegminal plates seen in tbis specimen are Orals or Am- 

 bulacrals. The Orals of this genus have never yet been described, for the structure figured and 

 described by Wachsmuth and Springer and S. A. Miller (see p. 24) is now shown by the 

 former authors to be the oral pyramid of Idiot-rinns ventricosus (Amer. Geol. X, p. 138; Sept. 

 1892). That 5 Orals were present, however, as maintained by W. and Sr. and as described 

 on p. 31, is proved by a British specimen of P. pilnia now in the collection of Mr. Wachsmuth. 



Fig. 9. Cup from above, with tegminal plates removed; showing articular facets for arms, surface for 

 support of anal plate, and pentagonal opening of calycal cavity. Petesvik. (p. 30.) 



Fig. 10. Same specimen; the articular facet of a radial. (pp. 29, 30.) 



Fig. 11. Conical form; vertical section, showing calycal cavity. Petesvik. (p. 30.) 



N. B. Specimens of this species have lately been found in beds b and c, near Wisby. 



P. ollula (p. 32). 



From 1. ant. radius. Wisne Myr. 



Same specimen; from below, showing a sub-triangular basal excavation. (p. 32.) 



Specimen with conical outline and flat base; from 1. ant. radius. Petesvik. 



Very low form; from r. ant. interradius. Linde Klint. (p. 32.) 



Specimen with broad radial processes; from above. Linde Klint. (p. 32.) 



Specimen figured by Angelin, Tab. IV, fig. 2; from above, showing calycal cavity and its 



constriction. Klinteberg. (pp. 30, 32, 33.) 



Same specimen; articular facet of ant. K. (p. 33.) 



Specimen with partially fused BB; from below. Petesvik (?). (p. 32.) 



Akad. Handl. Band 25. N:o 2. 24 



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K. S 



/. Vet 



