oe 
TRITOGONIA TUBERCULATA MUDDLE Ig! 
to the genus Quwadrula, and thus the hypothetical name is a 
hononym to Quadrula verrucosa (Barnes) Baker, 1808. 
7. UNIO PUSTULATA Swainson, 1840. Treatise on Malacology 
Neee7 5, vue. -545- Ge 
Name preoccupied by Unio pustulatus Lea, 1834=Quadrula 
pustulata (Lea) Simpson, 1900. 
8. UNIO GIGAS Sowerby, 1867, Cont. Reeve’s Conch. Icon- 
ica Vb: pl. L. Vin, fig.- 287. 
Simpson’ says that he thinks this is a rather high male 
Tritogonia tuberculata. Mr. Edgar A. Smith, of the British Museum, 
notes in a personal communication that the whereabouts of the 
type of the figure given in the Conchologia is unknown. He states 
further that, in his opinion, “it is the adult form of U. Cumingit, 
Lea, a Chinese form (figured op. cit. fig. 264). River Ohio, the 
locality given for gigas in the Conch. Incon. I regard a as one of 
the many mistakes in that work. I do not perceive any resemblance 
of gigas to U. verrucosa=tuberculata.”” 1 have been obliged to 
abide by Mr. Smith’s decision in this matter, as the work cited is 
very rare and expensive, and I have been unable to gain access 
to it, although I have applied to all the great libraries in America. 
However, if it shall be shown that U. gigas Sowerby, 1867, was 
ever really applied to a specimen of U. tuberculatus Barnes, this 
specific name will be available for transference to the genus 
Quadrula. Nevertheless, it will be difficult, if not impossible, 
to locate the type of the ‘icon, as it was sold, perhaps, with the 
collection. (E. A. Smith.) 
g. QUADRULA OBESA (Simpson) Vanatta, 1910, The Nautilus 
DOSNT = “102: 
Simpson’ described a variety of Tyritogonia tuberculata as 
Tritogonia tuberculata obesa. ‘This variety is considered valid, 
Wright & Walker’ listing it as a valid subpsecies in their Check- 
list. Vanatta used the “originally varietal name obesa Simps. 
instead of Tritogonia tuberculaia Bar., as the name ftuberculata is 
preoccupied in Quadrula.’”* But if we are to consider Tritogonia 
1 Proc. U. S. Nat. Mus. XXII 608, footnote 3, [1900]. 
2 Op. locis stip. cit. ,p. 609. [1900]. 
8 Checklist, N. A, Naiades, p. 18. [Detroit, Mich., 1902.] 
* Op. Vanatte citat. p. 102. 
