192 University of California Publications in Geology [Vol. ll 



Subkingdom VERMES 



Class ANNELLIDAE 



Order Polychaeta 



Genus SERPULA Linnaeus 



SEEPULA EECTIFOEMIS, n. sp.' 



Plate 24, figures 1 and 2 



Type srjecimen 11262, Coll. Invert. Palae. Univ. Calif., loc. 52 

 A mass of straight or nearly straight calcareous circular tubes, which have a 

 diameter of from 2 to 3 mm. The tubes are long and wherever they touch each 

 other they are cemented together. A tube may be cemented to another tube 

 along part of its length and be free from it along the remaining portion ; thus, 

 the tubes, compactly massed, weave in and out among themselves to some extent 

 but in general they all lie more or less parallel. They are somewhat smaller at 

 one end than at the other. The small ends of the tubes are all on the same side 

 of the block, this side evidently being the base of the colony. Surface of tubes 

 finely striated longitudinally. 



Occurrence. — University of California locality 52. 



Subkingdom CEPHALOPODA 



Subclass TETRABRANCHIATA 

 Family Clydonautilidae 

 Genus ATURIA Brown 

 ATUEIA sp. 

 Plate 17, figure 1 



Up to the present time only one specimen of the genus Aturia has been found 

 in the Agasoma gravidum beds of Contra Costa County ; it is very imperfect and 

 not determinable specifically. A good cross-section, however, is exposed, showing 

 the siphonal funnels reaching from one septum to the other, so characteristic of 

 this genus. 



Collected by John Buwalda at University of California locality 1173 ; found 

 associated with Dosini-a mathewsonii, Agasoma gravidum, Molopophorus liijrficatus, 

 etc. 



Phylum ECHINODERMATA 



Class ECHINOIDEA 

 Family Strongylocentrotidae 

 Genus STRONGYLOCENTROTUS Brandt 

 STEONG YLOCENTBOTUS 1 sp. 

 Spines, which appear to be referable to this genus, are rather com- 

 mon at University of California locality 1131. No good specimens 

 of the test have as yet been found. 



