Lower Palfpozoic Crinoids of Bohemia. 



109 



Vletavicrinus, a name derived from the ancient appellation 

 ot the river Moldau, on which lies Dvorce, is based on a 

 unique specimen from the black limestone (el-2) of that 

 locality. The specimen is an almost perfect crown, to which 

 47 millim. of stem remain attached. It forms the type of a 

 new species, V. Haueri. The crinoid (Fig. 4) is a Camerate, 



Fig. 4. — Analysis of the type of Vletavicrinus Haueri, outlines copied 

 from Waagen and John, nat. size. Shading as in fig. 1. The 

 portions of arms that surmount the anals are intended as repe- 

 titions of the arm-branches drawn also in the adjoining rays ; 

 the object doubtless was to show the relations of the pinuules, 

 but the chief result is to prove the inaccuracy of the diagram. 



but whether monocyclic or dicyclic is uncertain, since the 

 base is almost entirely hidden by the stem. Each ray con- 

 tains 2 fixed primibrachs, and the fixed secundibrachs in each 

 half-ray are said to be 7 or 8 (a number which each of the 

 five figures chooses its own way of contradicting - ), the last of 

 these being axillary. The left posterior interradius, as cleaned 

 from matrix by the authors, exhibits a proximal interbrachial 

 resting on the shoulders of the radials, and supporting two 

 parallel rows of interbrachials, which gradually become 

 smaller and more irregular and pass into the tegmen. Fifteen 

 plates in all are exposed in this interradius. The posterior 

 interradius shows over 30 plates, which seem to have passed 

 up into an anal tube. The proximal anal rests on the base, 

 and is followed by a single plate which supports two parallel 

 rows of irregular plates, 5 in each row, followed by smaller 

 plates. Rather large intersecundibrachs are visible in the 

 right and left posterior rays, arranged as in the diagram, and 

 succeeded by smaller and less regular plates. The arms, 



