SECONDARY AND TERTIARY FORMATIONS OF NORTH AMERICA. 147 



This species differs materially in the form of the cellules from any heretofore de- 

 scribed, resembling more nearly Reptescharellaovula,$0<ch. 



R. disparilis, n. s., fig. 29. — Colony encrusting. Cellules closely juxtaposed, ar- 

 ranged without any definite order; variable in form and size; normally rounded hex- 

 agonal, but most generally distorted by contact with adjoining cellules. Mouth 

 rounded in advance, straight behind ; bordered by a prominent raised lip which con- 

 tinues as a dividing wall around the cellule; at each proximal angle of the mouth is 

 often a small tubercle arising from the lip. Surface plain, slightly convex in the 

 middle and below the level of the dividing wall. Two elongated narrow special pores 

 are found immediately behind the mouth on the surface of the cellule close to the 

 dividing wall. 



Local!///. — Santa Barbara, Cal. Miocene. 



We have observed but two large well preserved colonies of this neat little species, 

 in each case encrusting another Polyzoon. It resembles in the general plan of the 

 cellules, Escharbtella mural is. but the mode of growth, the number and position of 

 the special pores, and the much later geological formation, cannot fail to distinguish 

 them. 



We observed no abortive cellules, nor ovarian vesicles. 



? R. Heermannii, n. s., fig. 30. — Colony encrusting. Cellules irregularly arranged, 

 oval or elongated in form; juxtaposed, convex, often nearly flat. Mouth terminal, 

 transversely elliptical to nearly semi-circular; proximal edge usually the straightest; 

 bordered by a slightly raised lip. Surface minutely punctate or perforate. Special 

 pores always present, placed behind the mouth near the sides of the cellule but varia- 

 ble in number, being always one, sometimes two. These pores are placed obliquely, 

 and bordered by a prominent raised lip. Ovarian vesicle round, prominent and punc- 

 tured like the surface of the cellule. 



Locality. — Santa Barbara, Cal. Miocene. 



Tne variable number of the special pores will probably entitle this species to rank 

 as a distinct genus. Sometimes in the same colony we find two prisent on a cellule ; 

 on the next, only the right hand one is present, and perhaps the next exhibits only 

 the left hand one. There is no particular arrangement of the cellules so provided. 



E. corxuta, n. s., fig. 31. — Colony encrusting, cellules agglomerated, only in one 

 layer; rpjadrangular in form; sides nearly parallel, sometimes slightly curved. Mouth 

 terminal, round to transversely elliptical, often bordered by a very small lip; prox- 

 imal lip deeply notched. Special pores abreast of, or in advance of the mouth, 

 placed at the ends of somewhat conical tubes arising from the distal angles of the 

 cellule, and looking almost directly forwards. Surface broadly convex and coarsely 

 punctate. The connecting pores, between the cellules are large and few in number. 

 We noticed but one lateral one, invariably placed near the proximal end of the cellule 



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