92 CALIFORNIA ACADEMY OF SCIENCES. 



MOLLUSCOIDEA. 



Class BRYOZOA. 



8. Bryozoa sp. indet. 



Small pieces of branching bryozoa are found quite abundantly in the San 

 Pedro series; but as no diagnoses of West Coast species are available, their generic 

 and specific relations cannot be given. Among some material sent to Dr. Dall, and 

 identified by him, were several specimens which he labeled ^^Cupulifera sp." These 

 little saucer-sHaped bryozoa are from the upper San Pedro deposits, at the lumber- 

 yard, north end of the San Pedro bluff. 



Class BRACHIOPODA.' 



Order ARTIIROPOMATA. 



Family IV. TEREBRATULID.E. 



Genus Terebratalia Bcecher. 



Shell smooth or radially plaited; dorsal valve longitudinally impressed; hinge-line straight 

 or not much curved; beak with a flattened area on each side of the deltidium; foramen large; del- 

 tidium incomplete; loop attached to the septum. 



Terebratalia obsoleta Dall is a characteristic species. 



[S. B.j2 Terebratalia hemphilli Dall. 



Plate XVII, Fics. 1, 2 and 3. 

 Terebratalia hemphilli Dall (mss.) 



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

 concave ; surface of this valve sculptured by numerous fine incremental lines, and very faintly near 

 the apex by several radiating lines ; pedicle valve mesially convex, the sculpture being as in the 

 brachial valve. 



Dimensions. — Long. 56 mm.; lat. 57 mm.; diam. 30 mm. 



This species may be distinguished from T. xmithi by its broader outline, larger 

 foramen, and nearly smooth surface. 2\ hemphilli is a form which shows much 

 variation both as regards its outline, degree of convexity or concavity of its valves, 

 and its sculpture. The drawings of this species were made by Mr. J. Howard 

 Wilson, who first discovered the species. Found in the Pliocene of Packard '.s Hill, 

 Santa Barbara. 



Pliocene. — Santa Barbara (Wilson; Arnold). 



' The clasHlficatlon and generic dCHcriptlon of Ihia class are from Tryon's " Structural ami Systematic ConcljoloKy." 

 » All Bpeclcs described Id tills paper, but not occurring in the San Pedro fauna, are designated by the Initials of the locality from 

 whence they are descriljed. 



