13() PROCEEDINGS OF THE NATIONAL MnSElJM. v<.i,. xxxii. 



In adult shells the last whorl is usually somewhat deflected below the 

 peripheral keel of the preceding tui"n, and the keel is thus exposed 

 above the suture. Operculum reddish brown, with scarcely depressed 

 eccentric nucleus and many tine lines of growth. 



The specimen figured proba})ly had seven and a half whorls (the 

 early ones being- somewhat eroded) and measures: Altitude, 32 mm.; 

 greater diameter, 24.5 mm.; lesser diameter, 21.1 mm.; aperture, alti- 

 tude (from the posterior angle to the base of the columella), 17.-4 mm.; 

 diameter (at right angles to the last from the middle keel of the outer 

 lip), 13 mm. There are eight specimens of this species in the collec- 

 tion of the U. 8. National Museum— three. Cat. No. 103669, from 

 Luzon, Philippine Islands, of which one has served for our descrip- 

 tion and figure; Cat. No. 104056b, one specimen, collected by Rich in 

 Luzon; one. Cat. No. 47996, collected by Hungerford at St. Cruz 

 Bay Lake, Luzon, and three specimens. Cat. No. 19985, obtained by 

 the North Pacific Exploring Expedition at Manila, Luzon, Philippine 

 Islands. 



VIVIPARA ANGULARIS BURROUGHIANA Lea. 



Plate X, figs. 3, 4. 



Paludina bnrrnnf/hiana Lea, Trans. Am. Phil. Soc, V, 18,37, p. 113, pi. xix, 

 fig. 80. 



There are three specimens in the Lea collection, Cat. No. 105640, 

 U. S. National Museum, which were collected by Doctor Burroughs 

 at Manila, Philippine Islands. Since the types were collected by 

 Doctor Burroughs at Manila, it is quite likely that these specimens 

 represent the cotypes upon which Doctor Lea based his description. 

 This appears all the more probable, as one of the three shells agrees 

 in every respect with the figure cited above. V. a. hurroughiajia 

 represents a strongl}^ sculptui'ed form of am/ularis. In this, the spaces 

 between the keels on the spire are marked with a number of slender 

 subgranose lirations. In some individuals these lirations attain almost 

 half the size of the middle keel. The sculpture of the base also is 

 much stronger than in F. angular is proper. There are five lots in 

 the collection, the one cited above, of which one specimen is figured, 

 Plate X, fig. 4, which measures: Altitude, 39.2 mm.; greater diameter, 

 28.2 mm. Cat. No. 19984, U.S.N.M., fifteen specimens, collected by 

 Wilsoup at Manila. Of these eight are nepionic shells. Cat. No. 

 90477, one specimen, from Manila, the strongest sculptured individual, 

 here figured. Plate X, fig. 3. Cat. No. 104056, U.S.N.M., one speci- 

 men, collected by Rich, in Luzon, Philippine Islands. Cat. No. 192975, 

 U.S.N.M., four individuals, collected by Maj. Edgar A. Mearns, at 

 Pasa}" Beach, Manila, Luzon, Philippine Islands. 



