Vol. 5] Pack. — Tertiary Echinoids of California. 



279 



Occurrence : The single known specimen of this species was 

 found in Miocene east of Muir, Contra Costa County. This spec- 

 imen was obtained by Mr. D. C. Birtch of the University of 

 California on one of the field excursions in March, 1909, and was 

 placed by him in the University collections in palaeontology. 



ASTEODAPSIS FEBNANDOENSIS, n. sp. 

 PI. 24, figs. 3 and 4. 



Test small; sub-oval in outline, anterior end rounded, poste- 

 rior end slightly pointed ; much depressed, upper surface very 

 slightly convex, apex central; edges rounded. Apical system 

 central; petals extend to margin, wide open at the end, raised 

 near the apical system but almost flush with the surface of the 

 test near the margin. Poriferous zones very narrow, together 

 forming about one-fourth the width of the petal. The two pos- 

 terior petals are gently convex toward the median line through 

 the posterior interambulaeral space. A broad, shallow depression 

 occupies the center of the interambulaeral areas; the two sec- 

 ondary depressions so prominent in Astrodapsis antiselli are 

 almost entirely lacking. Actinal surface gently concave, furrows 

 poorly marked, but apparently branched as in Astrodapsis anti- 

 selli. Anal pore sub-marginal, large, and oval in outline. The 

 posterior end of the test is produced beyond the pore to a small 

 point, particularly noticeable in the smaller specimens. Tubercles 

 very large, and set in well defined pits; apparently the same on 

 upper and lower surfaces. 



Dimensions: Longitudinal diameter 51 mm.; transverse di- 

 ameter 39 mm.; maximum height 8 mm. 



Occurrence: Fernando formation (Lower Pliocene?), Else- 

 mere Canon, Los Angeles County. 



ASTEODAPSIS ANTISELLI, Conrad; n. var. AENOLDI. 



PI. 24, figs. 1 and 2. 



1856. Astrodapsis antiselli Conrad Proc. Acad. Nat. Sei. Phila., vol. 8, pp. 

 312-316. 



1856. Astrodapsis antiselli Conrad Pao. E. E. Eepts., vol. 7, p. 196, pi. 10, 

 figs. 1 and 2. 



1908. Astrodapsis antiselli Conrad (Arnold) Proc. U. S. Nat. Mus., vol. 34, 



pi. 25, fig. 10. 



1909. Astrodapsis antiselli Conrad (Arnold) Folio 162, U. S. G. S., fig. 59. 



