Crinoidea, Encrinidae. 
15 
«Schlesischen Muschelkalke». The only locality given by Beyrich is «Kamin bei 
Beuthen» (Ober-Schlesien), 'l'his also is the locality of the specimen flgured by 
Roemer. Prof. Dr. Otto Jaekel, who kindly examined the specimens in the Berlin 
Museum für Naturkunde at my request, teils me that the other localities there 
represented are Rossberg near Beuthen, and Mikultschütz, and that there is no 
difference whatever between the forms from these three localities. Reference to 
Roemer (op. cit.) or to H. Eck («Über die Formationen des bunten Sandsteins und des 
Muschelkalks in Oberschlesien» Berlin, 1865) shows that the horizon of these localities 
is the same, namely the beds vvith Spirifer Mentzeli in the middle of the Lower 
Muschelkalk. The species then should be interpreted primarily by means of specimens 
from these localities, and this is attempted in the following account, based partly on 
Dr. Jaekel’s answers to my questions, partly on five entrochi from Rossberg which 
he kindly sent me (now registered Brit. Mus. E 7100, and here referred to as a, 
b, c, d, e), and partly on a large number of specimens from St. Hyacinth-Quelle 
near Beuthen, preserved in the Geological Museum of Tübingen University (16 of 
these, presented to the British Museum, are registered E 7116). 
Section circular. Side-faces flat or slightly convex, very rarely concave. Sutures 
with fine, distinct crenellae. Joint-face in most quite level, with a small but distinct 
axial canal, varying from circular to pentagonal, from which ridges radiate to the 
periphery. These ridges are, as Beyrich said, not granulär but smooth and clean-cut 
As they approach the periphery they increase in width and in number, the latter 
either by dichotomy or by the converse process — the intercalation of fresh ridges; 
thus in a joint-face 7'7 mm. in diameter, there are 15 ridges starting from the axial 
canal, and these have increased to 41 at the periphery. Incipient dichotomy of the 
ridges is frequently visible in the form of a groove running down the middle of each 
ridge for the whole or a part of its length. In some specimens a few of the longer 
ridges unite at their proximal ends to form a raised margin to the axial canal. In 
others there is, around the axial canal, a roughly pentagonal depression sometimes 
defined by a raised petaloid ridge, and within it may be either granules or finer 
ridges, due to a division of the main ridges by the above-mentioned median grooves. 
Neither cirri nor cirrus-facets are to be seen in the figures cited above or in the 
specimens at our disposal 
Measurements in millimetres are as follows: 
Quenstedt’s 
Roemer’s 
E 7116 
E 7100 
figure 
figure 
a 
b 
c 
d 
Diameter 
.7‘6 
7'5 
8-8 
77 
6'5 
5‘6 
5'0 
4‘3 
Average 
height of columnal L7 
2'0 
L8 
1-3 
T4 
2'2 
T3 
17 
Diameter 
of lumen ... ? 
0-6 
1 '5 
0'6 
07 
07 
07 
0'6 
In 1859 K. von Schauroth, doubtless in ignorance of Beyrich’s name, described 
and flgured columnals from the Trigonella Limestone near Recoaro, under the new 
name Encrinus ? radiatus} Except for the Statement that his specimens, with a 
diameter of 4 to 6 mm., had a height of scarcely 1 mm., the differences between 
them and the true E. silesiacus are but obscurely indicated. It is therefore not 
surprising that H. Eck (op. cit. 1865, p. 88) referred these specimens to the latter 
1 Sitzber. Akad. Wiss. Wien, Math.-Nat. CI. XXXIV, p. 288, pl. I, fig. 4. 
