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Storer’s New Species of Nucula 
4, 5, 6. Ovarium of do. and sections when the 
flower was a week old. 
a. Tube or vessel for the passage of the gran- 
ules of pollen. 
1. Ovarium of T. erectum ten days after the 
opening of the flower. 
8. Section of do. do. 
a.a. a. The sacs formed by the inner skin 
(endocarp) inclosing the ovula. 
9. Seed ripe (magnified). 
10. Section of do. (magnified). 
a. Chalaza. b. Raphe, and the vessels branch- 
ing off. c. Foramen. d. Embryo. e. Pul- 
py mass. 
ART. V.—DESCRIPTION OF A NEW SPECIES OF NU- 
CULA 
A FROM MASSACHUSETTS BAY. By D. HuxPHREYS 
Storer. Read January 31st, 1838. 
NucuLA THRACIEFORMIS. 
N. testa ovato-oblongá, transversi, nigrà, crass ; anticé —_ 
posticé subtruncatà et compressà, umbonibus prominentibus ; 
foveà magna. 
