384 



DR F. A. BATHER. 



Paratypes, various imprints from Trubsko, Brit. Mus. E16022-E 16025, which with 

 the holotype were obtained from the R. Bohemian Museum in 1912. Also similar 

 imprints, Brit. Mus. E16027-E 16030 and E 1 6101-E16103, received from J. Barrande, 

 and all accompanied by Barrande's original MS. label " Cystid. Sedgwicki, Barr. D — 

 Trubin." It was, however, clear from examination of the matrix, from Barrande's 

 statement as to the scarcity of Dendrocystis in " dS, les schistes noirs de Trubin," and 

 from comparison with Barrande's figures, that our specimens came from Trubsko. 

 This was confirmed by Dr J. Perner, by the specimens E16022-E 16026, and by the 

 specimen of D. Sedgwicki represented in Barrande's pi. 27, f. 18. This last is 

 believed by Dr Perner to be the only one among the specimens of Dendrocystis 

 figured by Barrande which really comes from d3, Trubin. 



§ 93. Of the other specimens said by Barrande to come from Trubin, Dr Perner 

 believes that the original of pi. 27, f 17 came from d4 of Zahorzan ; the original of pi. 27, 

 f. 1 from d2 of Trubsko. The latter specimen was also among those submitted to me, and 

 I accept Dr Perner's opinion. It is therefore probably a specimen of this species, but 

 it is not a very good one, and, owing to the confusion as to its locality, is better ranked 

 merely among the paratypes (PI. I. fig. 2). 



Other specimens presumed to belong to this species, though not examined by rae, 

 are represented in Barrande's pi. 27, ff. 5 (this shows two thecas together), 19, 20, 

 21, 22, 23. 



§ 94. Description. — (Text-fig. 6.) Theca. Outline more regularly cordiform than 

 in D. Sedgwicki, but not bilaterally symmetrical, tending to convex outline on adbrachial 

 side and to concave on antibrachial. Lobes subequal, antibrachial slightly more pro- 

 nounced, both descending slightly but clearly below stem-attachment. Narrow end 

 truncated by a slightly concave curve ; one of the two slight shoulders thus formed 

 supports the brachiole. (See specimens, Brit. Mus. El 6028 [PI. I. fig. 4], E 16029.) 



§ 95. Measurements of Theca in millimetres : — 





Height. 



Width Above. 



Greatest Width. 



Ratio of Width 

 to Height. 



E 16023 

 E 16026 

 E 16028 

 E 16029 

 E 16006* 



22-7 

 20-6 

 20-4 

 20-5 

 ca. 25 



ca. 8-5 

 ca. 7*3 

 ca. 7 

 ca. 7 

 ca. 7-3 



19-5 



18-6 



18-5 



18-5 



ca. 24-5 



•85 

 •9 

 •9 

 •9 

 ca. -98 



The height is measured from the stem-attachment to the depression between the 

 shoulders. An outside measurement, covering both lobes and shoulders, would make 

 the ratio of width to height nearer "85 than '9. 



§ 96. The convexity in the lower half of the theca is well marked in nearly all 



* This is a squeeze taken from the original of Barrande, pi. 27, f. 1. 



