1865.] DR. H. DOHRN ON THE MOLLUSKS OF THE ZAMBESI. 231 
Fig. 5. 
Skull of Phocena spinipinnis, seen from above, reduced one-third. 
Plata, and was afterwards exhibited in Buenos Ayres to the public, 
some years before [ came to this country. 
Length of the whole skull, 29 centim. 
Breadth between the orbits, 17 centim. 
Length of the external margin of the upper jaw, 12 centim. ; of 
the lower jaw, 22 centim. 
Note.—The tympanic bone is lost ; the figure is therefore defective 
in this part. 
2. List or THE LAND AND FRESHWATER SHELLS OF THE ZAM- 
BESI AND LAKE Nyassa, EASTERN TrRopicaL AFRICA, COL- 
LECTED By JoHN Kirk, M.D., F.L.S., &c. By Dr. H. 
Dourn. 
[The following list of land and freshwater shells, collected by me 
on the Zambesi and Lake Nyassa, has been drawn up by Dr. H. 
Dohrn, who has kindly undertaken their examination and description. 
The Unionide of the lake having previously been described and 
figured by Isaac Lea, in a paper read before the Academy of Natural 
Sciences of Philadelphia, April 12th, 1864, are not here included. 
They numbered six species, and one still remains undescribed. 
Of the twenty-four species noticed in this list by Dr. Dohrn, seven 
prove new to science, thirteen have been known before, and four be- 
long to difficult families. To each species I have added the localities 
where found. 
