ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OP SAN PEDRO. 93 



9. Terebratalia smithi, sji. nov. 



Plati; 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. .ind before, the 

 shell is slightly broader proportionately than in the adult. 



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



7'. >imithi resembles 1\ hemphilli Dall (mss.), but diffei's from (bat species by 

 being mucb narrower in all .stages of growtb, liaving a nuicb smaller foramen, and 

 in being mucb more prominently sculptured. A large series of 7\ hemphilli collected 

 from tbe Pliocene at Santa Barbara by Mr. J. Howard Wilson was compared witli 

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

 tioned above. The drawings of 7'. 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 7'. 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 hienial processes, at or near the points where the two septal processes branch oft" to the septum; 

 foramen complete. 



Type, Laqueus calif ornicus Koch. 



10. Laqueus jeffreysi Dull. 



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



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



Megerlia jeffreysi Dall, Sci. Res. Expl. Alaska, 1877, p. 48. 



Laqueus califor7iicus var. vancouvereyisis Davidson, Mon. Rec. Brachiopoda, Trans. Linn. Soc, 



2nd Sen, Vol. IV., 1887, p. 113, PL XVIII, figs. 10-13(5 (adult), {jide Dall). 

 Laqueus jeffreysiYiwA., 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 hannal valve rather prominent, 

 smooth. Neural beak incurved, truncated, not prominent. 



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



