800 PROCEEDINGS OF THE NATIONAL MUSEUM. 



the ventral margin, but not spinose or imbricate. It is Z. occidentalis 

 Reeve and L. j)(rfhiaf(i C. B. Adams. 



JAGONIA ORBICULATA var. FILIATA Ball, 1901. 



Florida Keys, Bermuda, and southward to Cuba and Yucatan, in 85 

 to 300 fathoms. 



This is the deep-water type with ol>solete sculpture and entire, not 

 divaricatinjj-, riblets radiating directly to the margin. Reeve's figure 

 of ohThpia fairly represents this form. 



JAGONIA ORBICULATA var. IMBRICATULA C. B. Adams. 



Jamaica, Santo Domingo, Santa Lucia, Curasao. 

 This form has straight, strong ribs, not divaricating, and concentric- 

 ally, evenly subimbricate, 



JAGONIA ORBICULATA var. RECURVATA Dall, 1901. 



Florida Keys to Cape San Antonio, in 8 to 300 fathoms. 

 This form is more plump and the dorsal radials are distall}' arcuately 

 recurved, meeting the shell margin at right angles. 



CODAKIA (JAGONIA) COSTATA d'Orbigny, 1846. 



Cape Lookout, North Carolina, southward to Rio de Janeiro, and 

 San Sebastian, Brazil, in 13 to 85 fathoms. 



This is Lucina costata d'Orbigny, 1846, but not of Tuomey and 

 Holmes, 1856; L. textills Philippi. April, 1850, but not of Guppy, 

 1896; Lucina antillarura Reeve, August. 1850; Lucina ornata C. B. 

 Adams (Manuscript 1847), 1852, but not of Reeve, 1850, nor of Agas- 

 siz, 1845. 



This species varies from suborbicular to very inequilateral, but is 

 easily recognizable b}' its fasciculated riblets and wedge-like shape. 



CODAKIA (JAGONIA) PORTORICANA Dall, 1901. 



Mayaguez Harbor and San Juan de Porto Rico, in 20 to 30 fathoms. 

 A small and inconspicuous species, which is provisionally located in 

 this group. 



CODAKIA (JAGONIA?) PECTINELLA C. B. Adams, 1852. 



Jamaica and southward to Point Malaspina, on the Argentine coast, 

 where it was dredged in 51 fathoms. 



This little species is (juite distinct from any of the others and wants 

 the right anterior cardinal tooth. The radial ribs are strong and 

 crossed l)y slender, sparse threads, which become lamellose on either 

 side of the ))eaks. It may eventually be shown to bo better placed in 

 one of the groups included in Phaco/dcn^ 



^It is figured in the Porto Rico Report, pi. vi, fig. 9. 



