TRANSACTIONS OF WAGNER 

 IOS2 



TERTIARY FAUNA OF FLORIDA 



Macoma Kelseyi n. sp. 

 Plate 49, Figure 7. 



Pleistocene of San Diego, California, obtained in the City Park by Dr. 

 R. E. C. Stearns. 



Shell large, solid, heavy, compressed, slightly flexed ; beaks subcentral, 

 prominent, pointed ; anterior end evenly rounded into an arcuate base and 

 dorsal margin ; posterior end lanceolate, the dorsal margin nearly rectilinear ; 

 surface sculptured only by strong, rather irregular lines of growth ; hinge- 

 plate short, broad, and strong ; teeth normal, elongated, large ; pallial sinus 

 discrepant in the two valves ; left valve with the upper part of the sinus sinu- 

 ous, extending from the posterior to the anterior adductor, behind which is 

 a thickened obscure ray ; right valve with the sinus short, gibboLis, the anterior 

 end rounded, thence the line curves backward before coalescing with the 

 pallial line below ; in the left valve the sinus is coincident with the whole of 

 the pallial line below. Lon. 86, alt. 56, diam. 20 mm. 



This fine, large species is closely related to the recent and Pleistocene M. 

 nasuta Conrad, from which it dififers as follows : it is larger, heavier, and 

 flatter than any specimens of M. nasnta yet recorded ; the ridge bounding 

 the posterior dorsal area is less prominent, and in all the specimens of M. 

 nasuta examined the line of the sinus joins the pallial line below at a right 

 angle without previously curving backward. The most obvious external char- 

 acter is the comparative flatness of the posterior part of the right valve and 

 its narrower dorsal area in M. Kelseyi. The latter is named in honor of 

 Professor F. W. Kelsey of San Diego, who has given much attention to the 

 local shell farma. 



Other species of typical Macoma which have been reported from the post- 

 Eocene beds of the Pacific coast are Macoma arctata Conrad (1849, as Tellina, 

 not Tellina arctata Conrad, 1843, from North Carolina) from the Miocene 

 of Oregon ; M. congesta Conrad (as Tellina in P. R. R. Rep., 1855, v., App., 

 p. 323, pi. iii., figs. 14, 18, 21, 210) from' the white shales of Monterey County, 

 California, Miocene; T. diegoana and pedroana Conrad {op. cit.) appear 

 to be unrecognizable; T. eborea Conrad (in Meek's Miocene Checklist, 1864) 

 seems to be merely a list name never figured or described ; T. ocoyana Conrad 

 (1855, P. R. R. Rep., v., p. 329, pi. viii., fig. 75) is referred to Macoma by 

 Gabb, but has not been recognized since it was figured by Conrad from Blake's 

 Ocoya Creek collection; M. indentata Carpenter, M. e.vpansa Carpenter, and 

 M. nasuta Conrad have all been cited from the Miocene of California or 



