424 NOTES ON FLORIDA UNIONID#—SIMPSON. 
quite a strong posterior ridge, and are subplicate on the posterior-dor- 
sal slope. I can not connect it with any described species. 
Unio obnubilus Lea. 
(Plate Lxv1, Fig. 3.) 
Unio obnubilus Lea. Obs. vi. p. 84, Pl. xvi, Fig. 64, June 23, 1857. Buckhead Creek, 
Burke County, Ga.; Bishop Elliott. 
Unio Nolani B. H. Wright. Proc. Acad. Nat. Sci., Phila., 1888, p. 116, Pl. rv, Fig. 1. 
Lea’s figure is that of a male which is not so produced in the poste- 
rior ventral region as the females. Mr. Wrights figure of U. Nolani is 
that of a female, and excellently represents dozens of female Specimens 
of U. obnubilus before me, most of which have been labelled by Dr. 
Lea. Although he described his species as uniform in color, several 
specimens received by him later are rayed. Three are before me be- 
longing to Mrs. Andrews, collected by F. Rugel in Black Creek, Florida, 
and labelled Unio nolani by Mr. 8. H. Wright, which agree in every 
respect with Lea’s types of obnubilus. Another shell from the same 
locality and collection, which is identical with this, Mr. Wright has 
labelled U. Tuomeyi. The color of the epidermis and nacre is much like 
occultus, but the form is more quadrate, and it is a larger species, yet 
the young are very like those of the latter. 
Unio lugubris Lea. 
(Plate Lxv1, Fig. 4; Plate txvn, Fig. 1.) 
Unio lugubris Lea. Obs. 11, p. 30, Pl. 1x, Fig. 25, Feb. 25, 1836. Hopeton, near 
Darien, Ga.; Prof. Shepard. 
A species allied to ocumulgeensis, Geddingsianus, Whiteanus , and 
to some forms of U. Buckleyi, and which does not possess any very de- 
cidedcharacters, Theyoung shells are often blackish green and rayed; 
the adults become brownish black; they lose their luster, and are 
sometimes arcuate when old. Lea’s figure poorly represents the species. 
Several young shells from Black Creek, collected by Rugel and now in 
Mrs. Andrews’s collection, are undoubtedly this species. 
Unio ocmulgzensis Lea. 
(Plate Lxvu, Fig. 5.) 
Unio ocmulgeensis Lea. Obs. vu11, p. 89, Pl. xrv, Fig. 243, Feb. 5, 1861. Little 
Ocmulgee R., Ga.; S. M. Wilson. 
Lea’s figure is from a badly eroded specimen, though the form is 
characteristic. Some of the young shells are green, or blackish green 
and chestnut, elegantly rayed and polished, and resemble U. Buckleyi, 
but many are a dull uniform blackish, and in outline are much like U. 
Jayanus. Tn most of the Specimens the nacre is not brilliant save at 
the posterior end, where it is richly iridescent. One shell belonging to 
Mr. Marsh, and collected by Mr. Upson, of Rockford, IIL, is before me, 
and another, collected by Rugel, among Mrs. Andrews’s shells, both 
labeled Florida, are undoubtedly this species, 
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