REPORT ON UPPER PALEOZOIC FOSSILS FROM CHINA. 317 



Diaphragms are rather few and distant, and they are developed at very irregular 

 intervals. The vesicles observed in longitudinal sections vary greatly in size. As 

 a rule they are but gently convex, the upper and lower surfaces often being nearly 

 flat and parallel. 



This species is clearly distinct from American forms of similar geologic age, 

 and also from F. parasitica, the only species described by Waagen and Wentzel from 

 the Salt Range. It is also very distinct from F. tuberosa, a member of the Lo-ping 

 fauna described by Kayser. 



Locality and Horizon. Pennsylvanian (Wu-shan limestone) ; near Ta-ning-hien, 

 East Ssi-ch'uan (station 2). 



Orthotichia ? sp. 



This form is represented by a single specimen, and a very fragmentary one; 

 but the fauna known from this formation is so limited that it should not be left 

 altogether unconsidered, although a specific, and even a definite generic, identifica- 

 tion is impossible. 



The specimen has a length of 30 mm. and a width of 38 mm., the latter dimen- 

 sion being nearly complete. The total length was probably not short of 40 mm. 

 and may have been 45 mm. The shell is massive, measuring about 5 mm. in thick- 

 ness in the middle of the transverse break. From the rather high convexity the 

 inference may be drawn that the shell is a dorsal valve. The striation is fine, about 

 1 7 lirse being found within a distance of 5 mm. The shell is as usual profusely and 

 finely punctate, and in addition is marked by evenly distributed black points, much 

 larger and much fewer than the punctae, which are found only along the centers of 

 the lirae. These undoubtedly represent the location of numerous small spines which 

 have been broken and worn away. 



From the absence of plications it seems more probable that we have in this 

 specimen an Orthis, rather than an Enteletes, and from the high convexity that 

 we have an Orthotichia or a Schizophoria rather than a Rhipidomella. The last- 

 mentioned feature, however, is not so marked as to form very strong evidence. 

 Neither Waagen, from India, nor Kayser, from China, has described orthoids similar 

 to this in other respects and equaling it in size. Tschernyschew figures a shell from 

 Russia, however, identified as Orthotichia morgani [morganiana] Derby, which is 

 semblable. The horizon given in Russia is the Schwagerina zone. 



Locality and Horizon. Pennsylvanian (Wu-shan limestone) ; near Ta-ning-hien, 

 East Ssi-ch'uan (station 3). 



Derbya sp. 



This form is represented by a mere fragment, but as it is a ventral valve suffi- 

 cient characters are shown to determine the generic position and some of the specific 

 features. 



Unless this dimension is imperfect, the length measures 18 mm., while the width 

 is uncertain. The area appears to be only moderately elevated. The surface is 

 rather coarsely striate, the striae being broad and the lirae thin and strong. About 

 9 or 10 of the latter occur in a space of 5 mm. They are more or less regularly 

 unequal and in three series. 



The term Derbya is here employed only for the division of that genus which 

 Waagen called the septati. 



Locality and Plorison. Pennsylvanian (Wu-shan limestone) ; nearLiang-ho-k'6u, 

 East Ssi-ch'uan (station 7). 



