64 Annals of the South African Museum. 



24| 24f on the railway between Uitenhage and Graaff-Beinet (332), 

 in the railway cutting. 



Remarks. The specimen described in all probability has not 

 attained its full growth, and the manner in which the tube for 

 about the last 2 mm. of its length has grown free from the coil 

 suggests that we have only the commencement of an uncoiled stage 

 illustrated in this individual. The subsequent growth of the tube 

 was probably in a more or less nearly straight line as in Serpula 

 concava, and it is impossible to say what dimensions the detached 

 portion of the tube might attain. 



In general aspect this Serpula very closely resembles S. concava 

 (Sow.) (Upper Greensand), and agrees in the dimensions of the 

 coiled stage, but without a sufficient number of specimens for critical 

 comparison nothing further can be said regarding its actual affinities. 

 A similar form from the Neocomian of France was figured by Ley- 

 merie as Serpula lituola.* In the general habit and mode of growth 

 there is also resemblance to S. datnesi Noetling, f from the Ceno- 

 manian boulders of North Germany, but the African form differs in 

 the smaller number of whorls, the smaller dimensions, and the 

 thinner walls of the tube. 



SERPULA PINCHINIANA Tate. 



1867. Serpula (Vermilia) pinchiniana R. Tate, Quart. Journ. Geol. 

 Soc., vol. xxiii., p. 163, pi. ix., figs. IQa-c. 



The large cylindrical tubes of this form are sometimes seen 

 attached to massive lamellibranch-shells such as Exogyra imbricata 

 Krauss, or one of the pseudo-quadrate Trigonia. The adherent 

 stage is irregular in the direction of its growth : it sometimes follows 

 a sinuous course, and in some cases the tube is bent sharply 

 back upon its path and grows over itself. The generally smooth 

 surface of the tube is occasionally marked by irregular annular 

 thickenings. 



Mr. Rogers collected specimens from the Cliff on Buck Kraal, 

 Sunday's River, attached to Trigonia herzogi (122h), and at the left 

 side of the Coega Valley, half a mile down from the railway (458g, 

 on Trigonia holubi}. Another example is attached to a valve of 

 Exogyra imbricata from the Sunday's River (303), belonging to the 

 collection of the South African Museum. 



* Leymerie (3), pi. 6, fig. 5. 



t Noetling (1), p. 10 [206], Taf. i., figs. 8-10. 



