538 Dr. F. A. Bather — Notes on Yunnan Cystidea. 



The diplopores have already been discussed (p. 512); in spite of 

 their radiating arrangement they never cross a suture. The canals 

 pass in a straight line vertically or obliquelj'' through the plate, 

 emerging on the inner face in marked depressions, between which 

 the surface is raised in irregular prominences. 



Stnoci/stis mansu^i (^Reed, 1917, sub Ovocystis). (Text-figs. 

 3, 4, 6, 7, 12, 13.) 



Of the "nearly sixty specimens" mentioned by Dr. Eeed the 

 ten figured ones have been studied, viz. II, 2 to 11. None of these 

 seems to correspond with either I or II of Heed's table of measure- 

 7uents, which indicate much larger individuals; but II, 6 corresponds 

 fairly with his III. Although one of the smaller individuals, this 

 specimen is one of the more complete, and is therefore hereby selected 

 as Holotype. 



The following are actual measurements in millimetres : — 



Specimen 

 Height . 

 Greatest 



diameters 

 Diameters 



at base 



Peristome 

 plane 



(For explanation of angles, see under S. loc%yi.) 



The crushing makes it difficult to get the orientation, and in 

 several eases the anus is not preserved or not clearly seen. There 

 appears, however, to be little variation in the angle formed by the 

 peristome plane with the anal plane ; it is between 95° and 100°. 



As may be seen from Dr. Reed's pi. II, figs. 7, 8, and less clearly 

 from figs. 6, 9, the relative positions of the thecal openings are as in 

 S. loGzyi ; a line drawn from the anal centre through the hydropore 

 would approximately coincide with the line of the left anterior 

 food-groove. 



Reed's figs. 7 and 8 also show that the branches of the subvective 

 system are not really equal. As in S. loczyi, the left posterior 

 branch is the longest,, and the right posterior is the shortest 

 (specimens 6, 7, 8). 



The angle at which the branches of each pair diverge may in some 

 specimens be 60°-90° as stated ; but as measured in the figured 

 specimens, it varies between 90°, as in the left jjair of II, 7 and 9, 

 and 140°, as in the right pair of 7 ; in the right pair of 9 it is 130° ; 

 and in 8 it is 105° on the left, 106° or more on the right. These 

 measurements are confirmed by Mr. Brock's drawings. 



The Brachiole-facets are far from clear, so that one does not like to 

 lay too much stress on the occasional suggestion of two facets to the 

 branch, as in S. loczyi (see Reed, pi. II, fig. 8, r. ant. branch), 

 especially since Dr. Reed does not mention it. Note in fig. 8 how 

 very close the diplopores are to the food-grooves (also our Text- 

 fig. 12). The elevation of tlie thecal plate on which the facet 

 rests is, in this species, called by Dr. Reed an " oral boss" : would 

 not " brachiole boss " or " facet boss" be more appropriate ? 



II 



i48-5:i 

 30-9! 

 26-5 

 6-0 

 5-5 



brokeii 

 not pre 

 served 



