THE NAUTILUS. 39 



oval; that of the posterior retractor small, elongated-oval, separate 

 from that of the posterior adductor and situated immediately below 

 the notch at the end of the ligament; nacre dark, dull plumbeous, 

 tinged with green, more intense towards the beak cavity; scarcely 

 iridescent posteriorly. 



Length (of type) 69; height 35^; diam. 22 mm. 



Types (No. 30902 Coll. Walker) from the Kribi River, 17 miles 

 from Efulen, Kamerun. Cotypes in the collections of the Univ. of 

 Mich., the Philadelphia Academy, the Carnegie Museum, and Dr. 

 Louis Germain of Paris, France. 



Ten specimens, in alcohol, of this very distinct species were sent 

 by Mr. George Schwab to the museum of the Univ. of Mich., to 

 whose curator, Dr. A. G. Ruthven, I am indebted for specimens for 

 description. 



By reason of its sculptured surface, it evidently belongs to the 

 subgenus Aspatharia Bgt., as recognized by Simpson (1900) and 

 Germain (1909). 



In size, shape and in the peculiar sculpturing of the surface, which 

 requires the use of a lens to develop the detail, it is easily distin- 

 guishable from both of the allied species. 



Fearing that it might be included among the many new species 

 recently discovered by the French naturalists, I submitted a speci- 

 men to Dr. Louis Germain of the Museum of Paris, the well-known 

 expert on African Naiades, and am assured by him that it is entirely 

 distinct from any of the described species. 



Dr. A. E. Ortmann of the Carnegie Museum, who is making a 

 special study of the anatomy of the Naiades, has kindly prepared the 

 accompanying description of the soft parts. 



THE SOFT PARTS OF SPATHA KAMERUNENSIS WALKER. 



RY DR. A. E. ORTMANN. 



I am obliged to Mr. Bryant Walker for sending me a complete 

 specimen of the new species of Spatha, and the soft parts of two 

 others, for examination. The specimen with shell proved to be a 

 male; one of the other two was a sterile female, while in the third 

 the gills were in too poor condition (crushed and torn), so that no 

 attempt was made to ascertain the sex. 



