254 DESCRIPTIVE CATALOGUE 



Horizon. — Cretaceous — Flyseh. 



Locality. — Pahnern, etc., Switzerland. 



This " species " is readily separated from the others by the 

 arrangement of the lateral branches at right angles to the larger 

 branches. 



v. 11516. In PI. I, fig. 2, a small fragment from the Upper 

 Cretaceous is illustrated to show the branched thallus, 

 ■which much resembles the original description. 



Text-flg. 10.— CljOntlriteS patttlll^, Fisoher-Ooster. Sliowing the rect- 

 angular form of the brauches. Nat. size. After Fischer-Ooster. 



Genus ALGITES, Seward (emend.). 

 [Catal. Mesoz. Plants Brit. Mus., Wealden, pt. i, 1894, p. 4.J 



Seward's diagnosis, if emended, may be taken : — A generic 

 term to cover a presumably composite genus for those flattened 

 impressions " which in all probability belong to the class Algae, 

 but which by reason of the absence of reproductive organs, 

 internal structure, or characters of a trustworthy nature in the 

 determination of affinity, cannot be referred with any degree of 

 certainty to a particular genus or family." 



The separation of the cylindrical forms into another group 

 may at times seem arbitrary, but it is convenient at present. 

 Where all the " genera " are based on very unsatisfactory data, 

 it is well to use a clearly marked and stable character. 



