310 PROCEEDINGS OF THE NATIONAL MrSEUM. vol.xxiii. 



MACOMA (PSAMMACOMA) EXTENUATA var? PANAMENSIS Dall, 1900. 



Panama. 



This form is hardly disting-uishable from the Atlantic Macoma exten- 

 uata Dall, but appears to have a less polished surface and to be a larger 

 and somewhat higher shell. 



MACOMA (PSAMMOTRETA) AURORA Hanley, 1844. 



Gulf of California to Panama. 



This species was cited and labeled by Carpenter with the name of 

 Tellina domheyi Hanley, which is a Metis. 



It may be noted here that Macoma {Macalla) Brugu'ievei Hanley, a 

 Chinese species, and Macoma inornata Hanley, a Chilean species, are 

 erroneously referred to California in Bertin's ^Monograph of 1878. 

 Tellina pu7'a Gould, 1852, from Lower California, is the young of 

 Tellina mazatlanica Deshayes, according to Carpenter, but the figures 

 of Gould and Sowerby hardly sustain this view. The species is erro- 

 neously referred to Vancouver by Sowerb}" and Bertin. Tdlinahpcvi- 

 rostris Deshayes, 1854, is another species which has had a Californian 

 habitat wrongly assigned to it. 



DESCRIPTIONS OF NEW SPECIES. 



ATLANTIC COAST. 



TELLINA (EURYTELLINA?) GEORGIANA new species. 



(Plate II, fig. 3.) 



Shell of moderate size, rosaceous, more or less suffused w^th a yel- 

 lowish tinge, and frequently with obscure paler narrow rays near the 

 posterior slope; surface polished; valves compressed, subequilateral, 

 the anterior somewhat longer, rounded in front, descending more 

 rapidly and somewhat pointed behind, base arcuate; surface sculpture 

 of fine, even, concentric grooves with wider interspaces, these, on 

 approaching the umbonal ridge, in large part cease, those which per- 

 sist continue over the umbonal angle and to the dorsal margin as rather 

 distant sharp little elevated lamellae, the interspaces of which are very 

 finely obscurely radially striate; umbones not prominent, their apices 

 usually pale; lunule and escutcheon narrow and inconspicuous; hinge 

 normal, the right laterals well developed, the anterior subapproximate, 

 the left laterals oVjsolete; pallial sinus similar in l)oth valves, touching 

 the anterior adductor scar, wholly confluent below. Lon., 32; alt., IT; 

 diam., 6 mm. 



lug urtd type.— ^iO. 9377T, U. S. N. :M.; dredged by the U. S. Fish 

 Commission in the Gulf of Mexico, at station 2387, in 32 fathoms, 



