of the shell measures 55 mm., of which 25 mm. is occupied by the body cham- 

 ber ; probably it is not complete in its apical portion. The septa 1-1.5 mm. 

 apart. Neither the position and nature of the siphon and siphonal collar, nor 

 the .sculpture of the surface are shown by the single specimen. 



Locality : — Hui-lung-chi, Ta-kuan-ting, prov. Yun-nan (Yamada Coll.) ; in 

 a dark grey shale. The rock is quite similar to that with Trochoccras sp. 

 mentioned above. They are probably of the same geological age. 



Brachiopoda. 



(B)- I. Havasaka). 

 Pentameridse. 

 Pentamerus, Sow. 



Pentameru^ toorealis Eichwald. 

 PI. XII,, Fig. 9. 



i860. P,-ntamcrus borcalis, Eichwald : — Lethaea rossica, vol. I., p. 787. 

 ? 1894. P. obloiiga. Hall (pars) : — Nat. Hist. New York, vol. VIII., p. 59, 

 pi. LXX., fig. 4, etc. 

 1908. P. borcalis, GuRlCH : — Leitfossilien, vol. I., p. 59. p. I. 21, fig. I. 

 191 1. P. borcalis, Frech : — VoN Richthofen's China, vol. V., p. 15, 

 pi. IV., fig. 3. 



A specimen already mentioned and illustrated by Prof. Frech in his work 

 above cited is now to be described somewhat more in detail. The specimen 

 belongs to Prof Yabe, who while abroad had showed it to the former. The 

 only figures accessible to the writer for comparison are those of the named 

 species from the Baltic Region of Russia given by Dr. Gurich in his " Leit- 

 fossilien." The writer therefore greatly regrets that he is unable to study the 

 real affinities between the Chinese and the Baltic forms as he could wish 

 though Frech's authority may no doubt be followed as conclusive. 



