KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 2. 115 



species is yet known, and that from only one specimen; but since the form is one that 

 we should naturally expect to find somewhere, and since it has been found just at the 

 horizon where it was to be expected, I have little hesitation in regarding it as a good genus. 

 The name proposed refers to the ancient inhabitants of Gotland (/o'#o/). 



Gothocrinus gracilis, n. sp. 

 (Plate V, fig-s. 158—159.) 



This species is founded on a single specimen, which consists of a complete crown 

 and a portion of the stem. The state of prcservation and the sandy matrix do not permit 

 of the details being accnrately observed. 



Deseription of the specimen. 



l>ors;tl cnp, shaped as in Botryocrinus, but ralher wider at the base. The measure- 

 ments are, — width at base 2.5 mm.; width above 4.9 mm.; lieight 5 mm. The plates 

 are all higher than wide. 



No ornament is to be seen. 



Text-tig. 16. Dissectiori of the Dorsal Cup of Gothocrinus gracilis, 



accnrately made from the type-speciraen (X 4 diam.). 



IBP) 5, pentagonal as seen from exteriör. 



BB 5, hexagonal, except the posterior which is heptagonal. 



UK 5, shield-shaped. The articular facet occupies about two-thirds their width, 

 except, in r. post. radins, where it is rather wider in proportion owing to the compres- 

 sion of the radial by anal x. 



R' immediately beneath r. post. R, and separated from it by a horizontal sutnre as 

 in Dendrocrinus. It rests on pust. and r. post. BB, and supports 1)}' its upper sides anal 

 ■c and r. ant. R. 



The Arms reach a length of 32 mm. They bifurcate on the 4th or 5th primibrach. 

 The main branches are long and tine, and give off artidets altemately on either side, as 

 in Botryocrinus, the exact arrangement of which cannot be made ont. The slender and 

 graceful appearance of the arms has suggested the trivial name. 



