1867.] MESSRS. BAIRD AND ADAMS ON CHINESE SHELLS. 489 



4 inches, is about 2 inches wide, and on the interior surface is pro- 

 vided with about six highly elevated folds, which have other, smaller 

 folds between them. Both begin and end on the entrances of the 

 two pouches at the ends of the stomach. The right pouch, situated 

 near the pylorus, is smaller, but of the same figure and construction 

 as the corresponding one of the other or left side. Over this pouch on 

 the right end a high transverse circular fold separates a small chamber 

 from the central stomach ; and this part, after the fold, which is 

 separated into three different lobes by other folds, must be regarded 

 as a separate stomach, or a propylorus, because from it begins the 

 duodenum. There was only a short portion of this intestine ; but I 

 could observe soon after the beginning of it an expansion, like a 

 lateral pouch, which is also known in Phoccena, and very well figured 

 by Eappin his interesting work on the 'Cetacea' (Tiibingen, 1837- 

 38), pi. 6. f. 3/. I find thus a general resemblance in the stomach 

 of Pontoporia to that of Phoc^na, if we regard only the fundamental 

 type of both, and not the particular execution of this type in the 

 different genera. 



In the pouch on the right side of the stomach I found some 

 teeth of a Cephalopodous animal, belonging to the family of Loligo, 

 and also the lenses of the eyes of animals of the same group. This 

 proves that Pontoporia is a marine animal, and that it goes only 

 from curiosity or necessity in stormy times into the mouths of rivers. 

 The individual which we have had for a long time in the Museum 

 was taken near Maldonado, and is also a young animal ; but we have 

 skulls of full-grown size, 16" long, which prove that the whole 

 animal may be 4 feet long, the skull being somewhat more in length 

 than the third part of the whole body. My young specimen is 

 30 inches long, and the skull measures 1 1 inches. Under these cir- 

 cumstances I cannot believe that the large Dolphin of 1 5 feet in 

 length, seen by Freminville on the coast of Brazil, which Dr. Gray 

 mentions in the ' Catalogue of Seals, &c.' p. 232, was of this species. 



Note. — As I propose to give an extended description of the ske- 

 leton and the other parts, illustrated by well-executed figures, in one 

 of the forthcoming numbers of the 'Aii-les del Museo publico de 

 Buenos Aires,' I have not thought it necessary to enter here into 

 any further details respecting their structure. 



5. Notes upon some Interesting Chinese Shells, with a De- 

 scription of Two or Tliree New Species of Unionidce, col- 

 lected at Shanghai by Jones Lamprey, M.D., 67th Regi- 

 ment, C.M.Z.S. By W, Baird, M.D., and H. Adams, 



F.L.S. 



(Plate XXVI.) 



Amongst a variety of land- and freshwater shells brought from 

 Shanghai by Dr. Lamprey, and lately added to our National Col- 



