V °l889. n '] PROCEEDINGS OF THE NATIONAL MUSEUM. 251 



Genus LIMiEA Bronn. 



Limaea Bronniana Dall. 



Plate xiv, Fig. 9. 



Limcea Bronniana Dall, Bull. Mus. Cotup. Zoo]., xn, p. 22C>, 1886. 



Hab. — North Carolina to Barbados in 15 to 804 fathoms, U. S. Fish 

 Commission Stations 2596, 2G12, and 2619 being among the localities. 



Suborder MYTILACEA. 



Family MYTILID^. 



Genus CRENELLA Brown. 



Crenella (decussata var.f) divaricata Orbiguy. 



Crenella decussata (Montagu) Dall, Bull. Mus. Coiup. Zool., ix, p. 116; XII, p. 235, 



1886. 

 Nuculocardia divaricata Oibigny, Moll. Cuba, n, p. 311, PI. xxvn Figs. 56-59, 1845. 

 This little shell — described from the Antilles by Oibigny, and indis- 

 tinguishable from specimens of G. decussata of the same size, except 

 that it is usually whiter — never reaches the size of northern specimens 

 of C. decussata. The latter is found as far south as Cataliua Island, off 

 the coast of Santa Barbara County, California. The presence of a fresh 

 specimen of G. divaricata containing the animal, in dredgiugs at Station 

 2805, in 51 fathoms, mud, Panama Bay, was therefore not altogether 

 surprising. It is the first record of the Antillean form on the west 

 coast of America and adds to the probabilities of its being merely a 

 tropical race of G. decussata. 



Suborder NUCULACEA. 



Family LED1TLE. 



Genus MALLETIA Desmoulins. 



Malletia goniura sp. nov. 



Plate x, Fig. 10. 



Shell small, rather full, with a brilliantly polished olivaceous epi- 

 dermis, and faint sculpture of incremental lines ; umbones not promi- 

 nent; anterior end rounded ; base nearly straight; posterior extremity 

 bluntly truncate with a double flexure, caused by two well-marked 

 ridges extending from the beaks to the extremity of the shell ; lunule 

 and escutcheon linear or none; ligament external, short, black; hinge 

 line straight behind the beaks, descending slightly in front of them, 

 with nineteen anterior and twenty-five posterior, small, short V-shaped 

 teeth, the two series separated by a short edentulous space ; interior 

 polished, slightly iridescent; muscular scars rather large, faint ; the pal- 



