iy THE NAUTILUS. 
ANNOTATED List OF THE RECENT BRACHIOPODA IN THE COL- 
LECTION OF THE UNITED States Nationa Museum, witH DE- 
SCRIPTIONS OF THIRTY-THREE NEw Forms. By William H. 
Dall (Proc. U. S. Nat. Mus., 1920, Vol. 57, pp. 261-377). The 
collection of recent Brachiopods in the National Museum is 
unusually strong, containing 181 different forms, represented 
by over 6,000 specimens, including many original types. 
ON THE ANATOMY OF PALUDESTRINA JENKINSI. By C. G. 
Robson (Ann. Mag. N. H., 9 ser., V, May, 1920). This species 
has long been of interest on account of its rapid spread 
through the waterways of England, Wales and Ireland, and 
recently from the discovery that it is apparently partheno- 
genetic. It has a large crystalline style. There is a well- 
developed pedal gland as in Valvata. In the ovary were seen 
oocytes but no spermatozoa. There is also an organ corres- 
ponding to the spermatheca. The capacious brood-pouch is 
excavated in the pallial integument of the right side, and 
capable of holding over 40 young. The writer has already 
suggested that P. jenkinsi is a Potamopyrgus; it should be 
compared with some of the tropical species, none of which 
have been dissected.—H. A. P. 
THE RaDULA OF THE Mitrmp&. By Rev. A. H. Cooke (Proce. 
Zool. Soc. London, 1919 [1920], pp. 405-422, 18 figs. in text). 
A valuable contribution to our knowledge of the radula of 
this family. The work is based largely on the collection of 
the late Prof. H. M. Gwatkin. 
Costa Rican Lanp AND FRESHWATER SHELLS. By H. A. 
Pilsbry (Proc. Acad. Nat. Sci., 1920, pp. 2-10, 6 figs. in text). 
The paper is based on a collection made by Dr. P. P. Calvert 
and Mrs. Calvert in 1909 and 1910. Five new species are de- 
seribed.—C. W. J. 
