﻿LAMPSILIS 



127 



fuller just behind the center; surface perfectly smooth except 

 for rest lines, color greenish-yellow with beautiful broad, rich 

 green rays throughout ; between these broad rays there are 

 narrower and fainter ones : epidermis polished and very bril- 

 liant, wrinkled on the posterior slope ; ligament short and high ; 

 left valve with three small, rather blurred, subcompressed 

 pseudocardinals and two remote, short laterals, the hinge plate 

 between the two sets of teeth narrowed and rounded ; right 

 valve with two pseudocardinals, the lower the larger, and a 

 short, remote, high lateral. Beak cavities moderate; muscle 

 scars shallow ; nacre bluish-white, not brilliant, slightly irides- 

 cent behind. The type is probably a male shell, though in this 

 group there seems to be but little difference between the shells 

 of the two sexes. 



Length 48, height 28, diam. 19 mm. 



Type locality, Ocklocknee River, Leon County, Florida. 

 Unio kirklandiatms S. H. Wright. Naut., X, 1897, P- ^3^- 

 Lampsilis kirklandianus Simpson, Pr. Ac. N. Sci. Phila., 1900, 



p. 76, pi. I, fig. 7 ; Syn., 1900, p. 557. 



One of the loveliest Naiades in the world. The color pattern 

 is exquisite, and the epidermis is more highly polished than in 

 any Unione I know of. It closely resembles the brighter forms 

 of suhangulata, but it is much smoother and more brilliant, it 

 has a higher posterior ridge, and feebler, more compressed 

 pseudocardinals. 



Group of Lampsilis cl lip si form is. 



Shell elliptical, subinflated, pointed behind, that of the female 

 but slightly swollen at the post-base ; behind this inflation there 

 is a slight sinus ; beak sculpture doubly looped, the hinder loop 

 sometimes open behind : epidermis dull, rayed with wavy lines, 

 generally arranged in bands ; nacre white. 



Animal with the marsupium, colored below ; gills large, inner 

 wholly united to or only free from the abdominal sac a short 

 distance. 



