Clark: The San Lorenzo Series of Middle California 193 



Family Spatangidae 

 Genus SCHIZASTER Agassiz 

 SCHIZASTER CALIFORNICA Weaver 

 Plate 17, figure 2 



Linthia? calif omica Weaver, Univ. Calif. Publ., Bull. Dept. Geol., vol. 5, 



no. 17, pp. 272, 274, pi. 21, fig. 2, 1908. 

 Brissopsis calif omica Weaver, Stefanini, Boll. Soc. Geol. Ital., vol. 30, 



p. 705, 1911. 



Linthia calif omica Weaver, B. L. Clark, Univ. Calif. Publ., Bull. Dept. 

 Geol., vol. 9, no. 2, p. 15, 1915. 



Linthia calif omica Weaver, Clark and Twitehell, U. S. Geol. Surv., Mono- 

 graph 54, pp. 214-215, pi. 98, fig. 4, 1915. 



This species is common at University of California locality 2755, 

 which appears to be the locality from which Weaver obtained his type 

 specimen. Some of the species found associated with it are Leda 

 rostellata, Glycimeris tenuimbricata, Agasoma gravidum, etc. It was 

 at this locality that an imperfect specimen of an Archeocyathus (one 

 of the modern cup corals) was found, also found at localities 3051 and 

 3055, associated with a typical San Lorenzo fauna. 



Order ZYGOPHIUROIDA 

 Class OPHIUROIDEA 

 Family Amphiuridae 

 Genus AMPHIURA 

 AMPHIUEA? sp. 



A fragmentary specimen, apparently belonging to the genus 

 Amphiura, was found in the diatomaceous shale of the Markley 

 formation, University of California locality 3080. 



Subkingdom COELENTERATA 



Class ANTHOZOA 

 Subclass HEXACOEALLA 

 Family Turbinolidae 

 Genus THROCHOCYATHUS Milne-Edwards and Haime 

 TKOCHOCYATHUS sp. indt. 

 A cross-section of a poorly preserved specimen, referable to this 

 genus, was found at University of California locality 2755. The 

 specimen is determinable generically but is not sufficiently well- 

 preserved to warrant a description as a new species. 



