43- 



smooth, except numerous distinct costal striae in pinnate arrangement ; wall 

 thin. Calyx deep and abrupt, with flat bottom. Septal spines very minute, 

 numerous ; tabulae thin, numerous, about 8 in a space of 5 mm., mostly 

 horizontal, often coalescing and giving rise to horizontal series of coarse 

 vesicles of unequal size; not seldom spiniferous. 



The internal structure of the coral is very simple, with no other endothe- 

 cal elements than the tabulae and minute spiniferous processes. It represents 

 a new species probably allied 'loP.giabra Lindstrom from the Gotlandian of Got- 

 land. The named species is acompound corallum, thoughalsooftenfoundsimple ; 

 its corallites are provided with thecal expansions outside and horizontal tabulae 

 and numerous spiniferous processes inside ; the spines are very numerous and 

 arranged in regular lines in position corresponding to septa, over the whole 

 inner surface of calyx. The Chinese form also much resembles certain species 

 of Amplexus'^^ with the septa very diminutive in size. As I now believe, though 

 with some slight doubt, that there is no lamellar septa developed in the present 

 coral, it is assigned to the genus Polyrophc, and not to Auiplcxns. 



Locality : — No-lu-ping, Tung-hu-hsien, prov. Hu-pei (Usui Coll. J 



Bryozoa. 



Trepostomata. 

 Batostomellidae. 



Batostomella, Ulrich 



Batostomella antiqua Yabe sp. nov. 



PI. XIX., Fig. 4 ; PL XXVIII., Figs. 2a-b. 



Zisi^r/^^/w consisting of solid slender ramose branches, 1.5-4 mm broad; 

 slightly flexuous and circular in cross section. Zooccial tubes amalgamated per- 



1) G. LixDSTROM: Beschreibung einigcr Obersilurischer Korallen, Bihang till K. Svenska 

 Vet. Handlingar. Vol. XXIV, i8g6. p. 43, pi. VIII, figs, gg-ioo. 



2) For instance, exilis Bil ings ; L. M. Lambe: A Revision of the Genera and Species of 

 Canadian Plaeozoic Corals. Pt. II, p. 131, pi. IX, flgs, 5, 5 a, 5b. 



