36 



THE NAUTILUS. 



marks that the only sinistral AmpuUaria of which he had heard 

 was that described by Nevill as A. globosa subvar. sinistrorsa. 

 A sinistral A. conica was noticed by Miss E. J. Letson in Nau- 

 tilus XI, p. 33. Through the kindness of Mr. W. F. Webb 

 of Rochester N. Y. , I have lately received a fine sinistral speci- 

 men of AmpuUaria ampuUacea (L. ). It is a fresh, beautifully 

 colored example, wholly without erosion and measures 68 mm. 

 in height by 59.5 mm. in diameter. It was collected at Manu- 

 quid, Sarsogon, Luzon. — Bryant Walker. 



Valvata tricarinata perconfusa n. n. — I find that in 1897 

 Westerlund, (Ann. Mus. St. Petersb., p. 130), described a 

 Siberian species as Valvata confusa. I would therefore change 

 the name of the variety of V. tricarinata that I described as var. 

 confusa, in 1902 (Naut. XV, p. 124), to var. perconfusa. 



The Ponsonby Collection has been obtained by Dr. Bryant 

 Walker. It contains 7,500 named species and varieties, repre- 

 sented by 12,500 lots. Mr. Fulton, who inventoried it, says: 

 "probably the finest and most complete series of Helicoids ever 

 collected by one individual." 



An Arboreal Polygyra. — At the beginning of April, taking 

 advantage of the short spring vacation, Mrs. Cockerell went to the 

 Brownsville region of Texas in search of bees and flowers. The 

 bees collected include four new species and a subspecies, and 

 two species new to the U. S. Incidentally, snails were ob- 

 tained, and from San Benito come Praticolella berlandieriana, 

 Polygyra texasiana, etc. The specimens of P. texasiana are 

 mostly dead shells and of the ordinary form and size, but in 

 the epiphytic Tillandsias on the trees occured a peculiar small 

 variety, with max. diam. 7.3 to 8 mm.; pale brown color, 

 strongly ribbed above, striate beneath. I opened the base of 

 one, and there is no trace of a columellar tubercle such as oc- 

 curs in P. mooreana. This small arboreal race may be called 

 P. texasiana tillandsiee, nov. Type no. 116250 A. N. S. 



T. D. A. Cockerell. 



