ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 93 



9. Terebratalia smithi, sp. nov. 



Plate XVII, Fio. 9. 



Shell of medium size, subcircular in outline, rather thin ; brachial valve with mesial flexure 

 concave, surface of this valve sculptured by about thirty small, rounded, radiating ridges and several 

 prominent incremental lines ; intermediate incremental lines small and inconspicuous ; pedicle valve 

 quite strongly mesially convex, the surface being sculptured as in the dorsal valve ; beak with a 

 flattened area on each side of the deltidium ; foramen small. At a length of 20 mm. and before, the 

 shell is slightly broader proportionately than in the adult. 



Dimensions. — Long. 50 mm.; lat. 47 mm.; diam. 23 mm. 



T. smithi resembles T. hemphiUi Dall (mss.), but differs from that species by 

 being much narrower in all stages of growth, liaving a much smaller foramen, and 

 in being much more prominently sculptured. A large series of T. hemphiUi collected 

 from the Pliocene at Santa Barbara by Mr. J. Howard Wilson was compared with 

 the type of T. smithi, and the specimens in every case showed the differences men- 

 tioned above. The drawings of T. hemphilli (PI. XVII, figs. 1, 2, 3) were made by 

 Mr. J. Howard Wilson from a specimen obtained at Santa Barbara, and are inserted 

 here for comparison with the figure of the type specimen of T. smithi. T. hemphilli 

 has been found so far only in the Pliocene of Santa Barbara. 



This species and Laqueus jeffreysi are the only brachiopods which have so far 

 been found in the San Pedro beds. The type specimen, the only one found, was 

 obtained by Mrs. Oldroyd from the Pliocene of Deadman Island; it is figured in this 

 paper, and is now in the collection of Mrs. Oldroyd. 



Pliocene. — San Pedro (Oldroyd). 



Genus Laqueus Dall. 



Shell with the reflected portion of the loop attached by slender processes, on each side, to 

 the haemal processes, at or near the points where the two septal processes branch off to the septum; 

 foramen complete. 



Type, Laqueus californicus Koch. 



10. Laqueus jeffreysi Dall. 



Frenula jeffreysi Dall, Am. Nat., Vol. V., 1871, p. 55 (ismeniform stage). 



Ismejiia jejfreysi Dall, Am. Jour. Conch., Vol. VII, 1871, p. 65, PI. XI, figs. 7-10. 



Megerlia j^t/ffreysi Dall, Sci. Res. Expl. Alaska, 1877, p. 48. 



Laqueus californicus var. va7ico2tverensis Davidson, Mon. Rec. Brachiopoda, Trans. Linn. Soc. , 



2nd Sen, Vol. IV., 1887, p. 113, PI. XVIII, figs. 10-13^ (adult), {fide Dall). 

 Laqueus Jeffrey siViPOA., Proc. U. S. Nat. Mus., Vol. XVII, 1894, p. 725. 



Shell subcircular, inflated, with the margins of the valves nearly straight ; surface smooth, 

 waxen, with close, conspicuous punctations ; area marked by an incised line ; deltidia wanting ; the 

 two separated parts of the area narrow and very small ; beak of the hremal valve rather prominent, 

 smooth. Neural beak incurved, truncated, not prominent. 



Dimensions. — Long. 35mm.; lat. 35 mm.; diam. 17 mm. 



