10 SHELLS OF NEW ENGLAND. 
ure. For the present I prefer to follow Professor 
Forbes in uniting Yoldia with Leda. 
L. opesa, St., Pl. II. f.1. Bost. Proc. Oct. 1851. T. parva, 
tenuis, ovalis, ineequilateralis, posticé longior, epider- 
mide nitido, tenuistriato; apicibus parvis; margine 
ventrali modicé arcuato: areola parum conspicua; 
dentibus anticis decem, posticis duodecim, parvis. 
Long. .22, lat. .12, poll. 
This species is narrower and more inflated than the 
young of L. thracieformis. Prof. Adams informs me 
that it is the MV. navicularis of Mighels, (Maine Cat.) 
It is certainly not that of Couthouy. It was taken 
in deep water in Mass. Bay. 
L. saporitua, St. Nucula sapotilla, Gould, 100, f. 61. 
— Corall. Eastport Harbor, 10 f. mud, (W. 8.) 
Provincetown Harb. deep water, sand, (Totten.) It 
inhabits also the coast between these points. 
L. Cascornsis, St. Nucula Cascoensis, Migh. et Ad. 
Bost. Jour. iv. 40.— Casco Bay. Very probably a 
variety of L. myalis. 
L. myauis, St. Mucula myalis, Couth., 1838. Gould, 99. 
Yoldia angularis, Moll. 1842. (?) — Eastport to Cape 
Cod. 
L. urmatua, St. Nucula limatula, Say. Gould, 98, f. 
62.— Whole Coast. Laminarian. Eastport in 6 f. 
mud, (W.S.) Portland Harbor, (Migh.) Salem Har- 
bor, 1 to 3 f.(Wh.) Boston Harbor, 2 to 10 f. mud 
and sand, (W.8.) Vineyard Sound, (Ag.) Off Pas- 
que I. 5 miles from land, in 8 f. (Prime and W. 8.) 
L. Tenursutcata, St. Nucula tenuisulcata, Couth. 1888. 
