122 



University of California Publications in Geology 



[Vol. 8 



' ' Numerous large spines much like those of Schizaster have been found at 

 one locality in the Martinez, but if they belong to this genus at all they were 

 probably derived from another and much larger species. Tubercles larger on 

 the actinal surface. Peripetalous fasciole quite distinct on one specimen. 

 Traces of what appears to be the lateral fasciole have been seen beneath the anus. 



' ' Though crushed fragments of this species have been known to the writer 

 for some years, the first recognizable specimens were discovered by the members 

 of the class in palaeontology in April, 1907. 



"Not rare in the Martinez in Contra Costa County. Specimens preserved 

 only as impressions or easts, usually badly crushed." 



Mr. William Kew has redescribed this species as follows : 



"Dimensions: Twenty forms averaged 21.3mm. in length, the largest being 

 35 mm. and the smallest 14 mm. Of nine specimens measured the average height 

 was 14 mm., the highest being 22 mm. and the lowest 11mm. The ratio of 

 height to length varies somewhat. As a rule the length is greater than the 

 height. The average ratio of eight specimens is L:H = 1:0.5999. In one case 

 the ratio is L:H = 1:1.1. 



' ' Test deeply and distinctly notched anteriorly by the ambulaeral groove, 

 continuing around to the mouth of the actinal side with slight reduction in the 

 size of the groove. Posteriorly the test is truncated at right angles to the 

 bottom. Upper surface slopes steeply to the front and has a sharp ridge 

 running from the apical center to the posterior end which forms the summit 

 of the test. Apical system, eccentric, anterior to the summit. Shell of test 

 very thin, and rarely preserved. 



"Ambulacra broad and deeply sunken; anterior petal reaches almost to 

 margin; anterior laterals a little over half way and posterior petals very short 

 and almost circular in outline. Ambulaeral pores elongated and consist of 

 two series of three rows each, the middle row of the latter alternating with, 

 and overlapping the outside ones. Extremities of the petals closed. Mouth 

 opening situated about two-thirds the distance forward; broad, two-lipped. 

 Anus high up and at base of the sharp ridge forming the summit. 



"Apical shield shows madreporic body large and pentagonal in outline. 

 Tubercles small, numerous on both upper and lower surface, regularly spaced."' 



Bryozoa 



MEMBEANOPOEA(f), sp. 

 Incrustations doubtfully referred to the genus Membranopora were 

 found at University of California Locality 765 near Lower Lake, Lake 

 County, California. The zooecia are hexagonal, regularly arranged in 

 quincunx about 0.5 mm. long and 0.3 mm. wide. Surface slightly 

 concave and bordered by an impressed line. 



Brachiopoda 



EHYNCHONELLA( ?), sp. 

 Plate 7, figure 1 



A small brachiopod was found at University of California Locality 

 784 near Lower Lake, which has been referred doubtfully to the genus 



