el PROCEEDINGS OF THE NATIONAL MUSEUM. 419 
Unio Jayanus Lea. 
(Plate Lx1, Fig. 4). 
Unio Jayanus Lea, Obs. 1., p. 28, Pl. 1x. Fig. 23, Feb. 5, 1836, Florida; Dr. Jay. 
Unio Marshi, B. H. Wright (Plate Lx, Fig. 2), Proc. Acad. Nat. Sci., Phila., 1888, p, 
118, Pl. v, Fig.2; Lake Woodruff, Volusia Co. 
Unio Tryoni, B.H. Nright (Plate Lx, Fig. 1), Proc. Acad. Nat. Sci., Phila. 1888, p. 
120, Pl. v1, Fig. 2, Lake Woodruff. 
Lea described this species from single opposed valves of two individ- 
uals. At the present time there are in this collection a single normal 
pair about half grown, and an adult right valve, neither of which is 
the specimen he has figured. This species is very closely related to U. 
Buckleyi, so much so that it is often difficult to separate it, especially 
the young, yet Mr. Lea has placed it with aheneus, and Emmonsi, in the 
Fisherianus group, a long way from the former. In general terms it 
may be said to be wider, thinner, more attenuated at the posterior 
point, and more inflated at the ventral region, than that species. The 
form which Mr. Wright has called Unio Marshi is no doubt. a synonym. 
I have examined a specimen in the possession of Mr. Marsh, who re- 
ceived it from Mr. Wright, and by whom it was so labeled, and it is 
certainly Jayanus. U. Tryoni is only a rather wide, large form of the 
species under consideration, having usually a blackish, rough epidermis. 
Five specimens are in the Museum collection (Museum No. 91129), re- 
ceived from Mr. B. H. Wright, and collected in Lake Woodruff, labeled. 
by him Unio woodruffensis Wright, and afterwards changed to Unio 
Tryoni Wright, which are typical Jayanus and are identical with two 
specimens he has sent the Museum (Museum No. 91144) from Lake 
Beresford, to which he has given the latter name. Nor do they differ 
materially from eight specimens he has sent the Museum (Museum 
No. 91141) labeled Unio leonensis Wright, Lake Woodruff, near De Leon 
Springs. (Plate Lxu, Figs. 3, 4). 
Unio coruscus Gould. 
(Plate Lx1m, Figs. 1, 7.) 
Unio coruscus Gould, Proc. Bost. Nat. Hist. Soc., Vol. v1, p. 15. 
Unio Fryanus. B. H. Wright. (Plate Lx1u, Fig. 3.) Proc. Acad. Nat. Sci. Phila., 
1888, p. 113, Pl. 1, Fig. 1. Lake Ashby, Volusia County, Fla. 
A single specimen of this species is in Mr. Lea’s collection, presented 
to him by Dr. Gould, and collected in the St. Johns River by the 
donor. It is a small shell about 1 inch in height and 1.3 inches in 
width; oval in outline, rather solid, and apparently adult, or nearly 
so, and quite inflated. The epidermis is shining and varies from 
yellowish chestnut at the posterior end to greenish brown, and is 
slightly rayed. The posterior end has a manifest ridge, and shows 
Slight traces of biangulation; the nacre is bright purplish salmon, va- 
rying to brilliantly iridescent posteriorly. The shell is peculiar in be- 
ing somewhat truncated or squarely built at the anterior end, and this 
