38 PROCEEDINGS OF THE NA TIONAL MUSEUM. tol. xxxiii. 



clearl}^ defined, and has a nearly circular shape, irrespective of the 

 asymmetry of the corallite as a whole. This portion is rather constant 

 in size, and in few instances does it attain a diameter of more than 

 4 mm. The septa, which number from 25 to 27, are irreg'ular. They 

 are often alternately long and short, but in parts of the same corallite 

 may be equal, or in appearance replaced by vesicular tissue. Not 

 inf requentl}' one of the smaller (secondary) septa is seen to bend to one 

 side and to become confluent with a primar}^ one. The interseptal 

 loculi are rather abundantly partitioned by what in cross sections looks 

 like dissepimental tissue, but in realit}" has more the nature of nearl}^ 

 flat horizontal tal)ula3. As previously remarked, the septa are often 

 so contorted that they can not be distinguished from the interseptal 

 plates with which thc}^ intersect. 



The pseudocolumella, which occupies the central area, is fairly dis- 

 tinct from the surrounding structures and consists of relatively small 

 concentrically arranged cysts, which are nearly vertical in position, 

 but with the upper end distinctl}" inclined toward the center. The 

 ends of the septa reach nearly or quite to the pseudocolumella, and 

 some of them appear to connect with the plates which compose it. 



As members of the genus LifJiostrotion^ Lonsdale described and fig- 

 ured a number of Lonsdaleias from Uralian Russia, some of Avhich 

 may be related to the form under consideration. Lonsdale discrim- 

 inated his species upon characters which are not shown in ordinary 

 conditions of preservation, not, for instance, in the Chinese material, 

 and at the same time failed to give precise data regarding features 

 which I was able to ascertain. On this account a satisfactory compari- 

 son of the present form with his species can not be made. It seems 

 to be distinct from the American and European types whose descrip- 

 tions I have seen. No species belonging to the genus has as 3'et been 

 described from China. 



Locality and Jiorizon. — Pennsylvanian (Wu-shan limestone); near 

 Ta-ning-hien, East Ssi-ch'uan (Stations 1 and 2). 



MICHELINEA FAVOSITOIDES, new species. 



Of this species our collection contains a single specimen, which pre- 

 sents the followino- characters: 



Descriptio7i. — The shape appears to have been hemispherical, with 

 a flat base and a width greater than the height. The latter dimension 

 is estimated at about 40 mm., and the entire width at about 80 nnii. 

 The corallites are rather regular in size and shape, and usually small, 

 few of them attaining a diameter of 2i mm. The septa are closely 

 approximate, 11 to 13 occurring in the space of 5 mm. They are on 

 the whole rather regular, but arc distinctly convex and not infre- 

 quently confluent. Mural pores appear to be present, but, as shown 



