U N I . 



XXV 



Species 126. (Mus. Ci 



Unio Ingallsiancs. Uu. tedd mbelomjato-ovatu, gih- 

 bosiusculd, anfice rotuudald, •postki dec/ive aiiguluiu- 

 aciiminaid, lavigatd ; intense viridi. 



IxGALLs' Unio. Sliell somewhat eloiigately ovate, ra- 

 ther gibbous, anteriorly rounded, posteriorly slopiiigly 

 angularly acuminated, smooth ; dark green. 



Lea, Trans. Araer. Phil. See. 18.52 ; Obs. vol. v. p. 38. 

 pi. 2i. f. -il. 



Hub. Siam ; 13r. Ingalls. 



An interesting posteriorly acuminated type, of a dark 



shining green colour. 



Species 127. (Mus. Cuujing.) 



Unio incrassatus. Un. iesid oblonffo-securiformi,cras- 

 siuscidd, (jibbosd, antki decUvi-rotundatd, postice lafe 

 g'M(jso-angidatd, area posticd decussatha corriigatd ; 

 niyrlcante-brioined. 



The thickened Unio. Shell oblong wedge-shaped, 

 rather thick, gibljous, anteriorly slopingly rounded, 

 posteriorly broadly gibbously angled, posterior area 

 decussately wrinkled; dark-brown. 



Lea, Trans. Amer. Phil. Soc. 1810; Obs. vol. iii. p. 55. 

 pi. 16. f. 34. 



Hub. Georgia, North America. 



Of a peculiar broadly angled wedge-shape, tlie surface 



on the posterior area being cross-wrinkled. 



Species 12S. (Mus. Cuming.) 



Unio concestator. Un. tedd elliplico-omld, gibbo- 

 siusculd, rude concentrice striatd, antice contrac*e ro- 

 lundatd, postice sublate expansd ; fiiho-olivaced, viridi 

 radio id. 



The elliptic Unio. Shell elliptically ovate, rather 

 giljbous, rudely concentrically striated, anteriorly 

 eontractedly rounded, posteriorly rather broadly e.\- 

 panded ; fulvous-olive, rayed with gi'een. 



Lea, Pro. Acad. Nat. Sci. Phdad. 1857, p. 31; Obs. 

 vol. vi. p. 67. pi. 12. f. 48. 



//ub. (jeorgia. North .\merica. 



Of rather simple character, 

 manner on the interior side, whi 

 rather broadly expanded. 



Species 12'J. (ilus. Cuming.) 



Unio obtusus. Un. testa oblongo-ovatd, subi'Hiptici!. 

 gibbosd, Itevigatd, antice subquadrato-rotundafu, jhh- 

 tice gibboso-declivi, obscure lirato-radiatu ; fuico- 

 olivaced. 



The obtuse Unio. Shell oblong-ovate, slightly ellip- 

 tic, gibbous, smooth, anteriorly somewhat scpiaL-ely 

 rounded, posteriorly gibbously sloping, obscurely 

 ridge-rayed ; fulvous-olive. 



Lea, Trans. Amer. Phil. Soc. 1840; (Jbs. vol. iii. p. ;5'J. 

 pi. 11. f. 13. 



Hab. Georgia, North America. 



Partaking somewhat of the form of the preceding 



species, with the posterior side less expanded, gibbous, 



and obscurely rayeil with ridges. 



Species 130. (Mus. Cuming.) 



Unio bi-c.elatus. Uh. testd oblongo-ovatd, subcompressd, 

 rude concentrice striatd, latere antico conspiciie com- 

 presse rotundato, postico oblique declivi, umbonibus ni- 

 tidissime radiatim et concentrice snlcatis ; Uvido-fidcd. 

 otivaceo-tiridi postice radiatd. 



The doubly-carved Unio. Shell oblong-ovate, rather 

 compressed, rudely concentrically striated, anterior 

 side conspicuously compressly rounded, posteriorly 

 obliquely sloping, umboes very neatly radiately and 

 concentrically grooved; livid fulvous, posteriorly rayeil 

 with olive-green. 



Hah. ? 



A very characteristic species, unlike any American type 



with wdiich I am acquainted, having the umboes very 



neatly decussately carved, somewhat after the manner of 



Custalia. 



Species 131. (Mus. Cuming.) 

 Unio flavidens. Uu. testa trigono-securiformi, crassd, 

 umbonibus prominulis, latere antico brevissimo, rotun- 

 dulu, pos/icu trigono-acuminato ; nigricante-brunned. 



June, 18G5. 



