92 BULLETIN 77, UIsriTED STATES NATIONAL MUSEUM. 



ANOLOTICHIA RHOMBICA, new species. 

 Plate 2, fig. 9; plate 6, figs. 6, 7; text fig. 29. 



Dianulites rhombicum Dybowski, Die Chaetetiden der Ostbaltischen Silur- 



Formation, 1877, p. 33, pi. 1, fig. 9. 

 Not Chsetetes rhombicus Nicholson, Quart. Journ. Geol. Soc. London, vol. 30, 



1874, p. 507, pi. 29, figs. 11-116. 



This well-marked form, for which I have adopted the specific name 

 applied to it by Dybowski, is a common and characteristic fossil of 

 the Wesenberg beds. It was intelligently described by Dybowski, 

 who, however, very erroneously considered it to be the same as 

 Nicholson's Chsetetes rhombicus. The latter is a synonjrm of Chsete- 



FlG. 29.— ANOLOTICHIA EHOMBICA. tt, TANGENTIAL SECTION, X20, WITH PORTION OF A MACULA EEPEE- 

 SENTED; &, ANOTHER TANGENTIAL SECTION, X20, "WITH THE LTJNARIUM INCONSPICUOUS, BUT EXHIBITING 

 CONNECTING PORES ; C, VERTICAL SECTION, X20, WITH STRUCTURE OF WALLS AND CONNECTING PORES 



visible; d and e, two portions of a vertical section cutting the walls both vertically and 



LONGITUDINALLY, AND EXHIBITING THE CONNECTING PORES. WeSENBERG LIMESTONE (E), WeSENBERG, 



Esthonia. 



tes (now Rhombotrypa) guadrata Rominger, a very abundant ramose 

 trepostomatous bryozoan highly characteristic of the Richmond 

 group in North America. The only point of agreement between the 

 two species is the frequently rhombic shape of their zooscia, the one 

 character that misled Dybowski. Through the courtesy of Dr. 

 Mikliailowski, I have had the opportunity of studying an authentic 

 specimen, indeed probably the type-specimen, of Dybowski' s Dianu- 

 lites rhoTubicus, and I am, therefore, able to make the above identifica- 

 tion with certainty. 



The zoarium of Anolotichia rhombica is of thin, free, undulating 

 masses with a wrinkled epitheca on the basal side and a smooth^ 



