516 DR F. A. BATHER. 



Plate I. 



Dendrocystis Barrandei, §§ 89-107. 



Fig. 1. Holotype, Brit. Mus. E 16026. Reverse face, with brachiole on right. Shows character of 

 thecal plates. x 2 diam. 



Fig. 2. Brit. Mus. E 1 6006. Reverse face. Shows sugar-loaf plate, S, on the right, and above it a 

 projection of the theca. The distal region of the stem is well shown, but is not complete. Nat. size. 



Fig. 3. Brit. Mus. E 16024. Proximal portion of theca, with basal rim; proximal and median regions 

 of stem. X 2 diam. 



Fig. 4. Brit. Mus. E 16028. Obverse face, with brachiole on left. Note the single series of brachiolars, 

 and the adbrachial plates. x 2 diam. 



Dendrocystis Sedgwicki, §§ 108-126. 



Fig. 5. Holotype, in R. Bohemian Museum. Photographed from a squeeze, Brit. Mus. E 16005. 

 Obverse face, with brachiole on left. Shows sugar-loaf plate, S, and above it a projection of the theca. 

 The large folded plate, supposed by some to represent anal valves, is denoted by a; (§ 57). Adbrachials, 

 antibrachial lobe, umbonate plates, basal rim, and stem are well shown. Nat. size. 



Fig. 6. Brit. Mus. E 16031. Reverse face, with the adbrachial plates and proximal brachiolars on the 

 left. Below, on the left, are the narrow elongate plates probably connected with the vent (§ 74) ; some 

 stout plates below these probably belong to an adjacent underlying individual. The umbonate plates are 

 also shown. x 2 diam. 



Fig. 7. Brit. Mus. E 16021. The absence of umbonate plates suggests that this is the reverse face. 

 Note the angle and overlying notch on the right side (§ 77). The proximal region of the stem is well 

 shown (§ 124). x 2 diam. 



Fig. 8. Brit. Mus. E 16020. Distal region of stem, showing the alternation of dimeres towards the 

 rounded extremity (§ 122). x 2 diam. 



Fig. 9. Brit. Mus. E 16018. Two distal euds of the stem (§ 122). That on the right shows the 

 rounded extremity plainly. That on the left lies over part of a brachiole, and to the left of it the ridged 

 inner faces of the brachiolars are exposed (§118). x 4 diam. 



