COLLECTANEA. 



DESCRIPTIONS OF SHELLS AND MOLLUSKS, 



BY A. A. GOULD. 



REPRINTED FROM VARIOUS SCIENTIFIC PERIODICALS, WITH REVISIONS. 

 Whatever is enclosed in brackets [ ] has been introduced in the reprint. 



SILLIMAN'S JOURNAL, NEW SERIES. 

 D^= Vol. xxxviii. p. 196. Oct. 1839. 



Solecurtus nitidtjs. \_Machaera nitida, Invert. Mass.] T. 

 oblongo-ovata, utrinque rotundata, inequilateralis ; epidermide in- 

 flecta, luteo-virescente, glabra, postice corrugata ; costa alba, dila- 

 tante, retrorsuin flectente intus munita. Long. 3 ; alt. 2, 7 ; lat. 1.9 

 poll. 



From the stomachs of codfish caught on the Banks, and occasion- 

 ally on our shores. 



Mactra ovalis. T. magna, crassa, obovata, subtriangularis, 

 epidermide rudi fusco-viridi transverse corrugata induta ; umbonibus 

 vix antemedianis ; lunula curtii lanceolatti indistincta. Long. 4 ; alt. 

 2. 7 ; lat. 1.9 poll. From the Bank fisheries, in the stomachs of fish ; 

 and smaller ones in Boston harbor. 



Compared with M. solidissima it is smaller, more compressed ; the 

 beaks less elevated and more central ; the anterior end less elevated ; 

 the hinge more delicate ; the epidermis rougher and more dusky. 



[More recently named M. ponderosa by Philippi, because he says 

 the name ovalis belongs to a fossil species.] 



Bulla [Diaphana] debilis. T. parva, ovata, ventricosa, hyalina ; 

 basi truncata, sub-umbilicata ; spira retusa, discoidea ; anfractibus 4, 



