RESEARCH IN CHINA. 



which several genetically related species afford, I have adopted the plan of including 

 the genus and species in a single description. 



The growth of Carnegiea bassleri is in small lenticular masses, having a slight 

 thickness relative to their spread. One example, for instance, has a thickness of 

 but 4 mm. and a diameter of 35 mm. The structure is fine and dense and seems to 

 be entirely without the lamellate appearance which gives this group its name. 



In transverse section the coenosteum is seen to be made up of walls and aper- 

 tures, both possessing a very irregular and tortuous pattern. The walls are espe- 

 cially vermicular and inosculated, giving off disconnected spurs and dividing the 

 inclosed space into small separate apertures. The entire course of the walls seems 

 to be made up of curves, and the outlines of the apertures are of course correspond- 

 ingly curvilinear. The walls are relatively thick, and where projecting spurs are 

 given off these often appear to be rounded and enlarged at the disconnected end, 

 as if terminating in a pillar. Similar enlargements can be observed also in other 

 portions of the walls. The zooidal apertures are nearly equal in size and the whole 

 structure seems to be quite regular, but not infrequently several of the apertures are 

 confluent, although the larger one thus formed is so tortuous that it fails to have this 

 appearance in the tout ensemble of the section. Astrorhiza? appear to be entirely 

 absent. 



In longitudinal section the skeleton is seen to be composed of continuous zooidal 

 tubes and continuous walls, the latter being, as already shown in transverse section, 

 relatively thick. The zooidal tubes are rather closely tabulate and the walls are 

 perforated. The perforations are of unequal sizes and irregular distribution. It 

 is without doubt owing to these interruptions in the radial walls that in cross- 

 section two or more of the zooidal tubes appear to be connected into a single large 

 vermicular one. Sometimes, owing perhaps to the influence of tabulae and porous 

 developments, the walls in longitudinal section have a nodose appearance, somewhat 

 as in Stenopora. Of course the two genera are otherwise widely different and have 

 different affinities. 



In the lower part of the ccenosteum the zooidal tubes are narrow and bent 

 inward toward the point of origin, as in colonies of compound corals and bryozoans. 

 In this region the walls are thin and the pores and tabulae much less plentiful. 



This form appears to be but distantly related to those described from the Salt 

 Range of India, and it presents more structural affinities with the older genus 

 Stromatopora. From this, however, it is clearly distinguished by the pattern of 

 the apertures and by the absence of astrorhizae and of latilaminae. The zooidal 

 tubes and bounding walls are much more continuously and regularly developed, and 

 the walls themselves apparently somewhat different in construction. They appear 

 to be dense, and but for the local thickening, which may represent radial pillars, 

 structureless. Carnegiea seems to belong to the Stromatoporidae, but to be distinctly 

 different from any of the genera at present assigned to that family. 



Locality and Horizon. Pennsylvanian (Wu-shan limestone) ; nearLiang-ho-k'ou, 

 East Ssi-ch'uan (station 7). 



Archseocidaris sp. 



In the Shan-tung cherts (station 59) a species of Archccocidaris occurs, repre- 

 sented by molds of fragments of the characteristic spines. They are of very small 

 size, round in cross-section, about 0.25 mm. in diameter, and covered with relatively 

 large and closely set spinules, which are arranged in about eight longitudinal rows. 

 Those in the same row are about o.i mm. apart. 



Locality and Horizon. Pennsylvanian; near Ts'ai-kia-chuang, Shan-tung 

 (station 59). 



