276 Sir iY. Yerinoloff- — Diatom Eartlc in California. 



The abundance of the Dictyocha and Euodia is, indeed, the most 

 remarkable feature in the Lompoc deposit. 



As to the Radiolaria, the sponge-spicules, and the Lithasterisci, 

 they are not by any means numerous and present no peculiarities. 

 There are also no calcareous remains, such, for instance, as the 

 plates of Holothurians, so well known in the Barbados earth. This 

 is also an important fact, confirming the northern character of the 

 Lompoc deposit. 



List of Siliceous Organisms in the Fossil Deposit of 

 Lompoc, Santa Barbara Co., California. 



symbolophorus Grun. One specimen 



in nine slides. 

 oclontophorus Grun. Frequent. 

 odontodiscus Grun. Frequent. 

 interlineatus Rattr. Not rare. 

 extravagans A. S. Not rare. 

 divisus Grun. Rare. 

 minutelhis Rattr. Rare. 



(6) CURVATULUS GROUP. 



curvatulus Grun. Frequent. 

 nodulifer Jan. Frequent. 

 ceginensis A. S. Frequent. 

 radiolatus Ehr. Frequent. 

 radiosus Ehr. Frequent. 



(l) RADIATI. 

 (a) RADIATUS GROLTp. 



radiatus Ehr. Frequent. 

 Argus Ehr, Frequent. 

 obscurus A. S. Rare. 



(h) OOXJLUS-IRIDIS GROUP. 



oculus-iridis Ehr. Frequent. 

 borealis Ehr. Frequent. 

 astpromphalui Ehr. Rather rare. 

 c.iitralis Ehr. Frequent. 

 perfwatus Ehr. Not rare. 

 apiculatui Ehr. Not rare. 



(c) HETEROPORUR GROUP. 



heferoporus Ehr. Rare. 

 crassus Bail. Rare. 

 gigas Ehr. Frequent. 

 diorama A. S. Frequent. 

 buUiens A. S. Rare. 

 decrescens Grun. Rare. 



(d) FIMBRIATUS GROUP. 



fimbriatiis Californica Grun. Frequent. 



(e) MARGINATUS GROUP. 



marginatus Ehr. Frequent. 

 robustus Grev. Frequent. 

 robustus bisculptus Rattr. Not rare. 

 robustus with " springs ". Not rare. 



See p. 64 Rattray Revision. 

 robustus fragilis Rattr. Not rare. A 



Pyxidicula (?). 



(c) eleganti. 



(d) elaborati. 



[e) cocconeipormes. 



coscinodiscus. 

 (a) inordinati. 

 iurgidus Rattr. Rare. 



(b) cestodiscoidales 

 None. 



None. 



None. 



None. 



(f) EXCET^TRICr. 



excentricus Ehr. Abundant. 

 decipiens Grun. Frequent. 

 minor Ehr. Frequent. 



Transitional forms to the Group 

 Lineati : 

 Frequent. 



(g) lineati. 

 lineatus Ehr. forma minor. Frequent. 

 lineatus Ehr. Frequent. 

 leptopus Grun. Frequent. 

 anguste-lineatus A. S. Frequent. 

 marginato lineatus A. S. Frequent. 

 bipartitus Rattr. Without lobes. 



Frequent. 

 blandus A. S. Frequent. 

 (h) fasciculati. 



(a) SUBTILIS GROUP. 



subtilis Ehr. Rare. Small, poor 

 specimens. 



