236 



BRITISH PALEOZOIC ASTEROZOA. 



Oral Surface (PI. XVI, figs. 3—7; Text-fig. 171).— The text-figure is drawn 

 [mm one of the smaller individuals (R = 36 ram.). The mouth-angle plates are 

 of the typical Palasterina type. Immediately behind them is a stout odontophor 

 as in /'. scotise, but it is not swollen or ornamented as in that form. Behind the 

 odontophor in the left interradius is a large madreporite of the same form as that 



MAP. 







)■ 



M 



Acl. 



Am . 



Text-fig. 171. — Drawing of an arm and the neighbouring interradii of Palasterina follmanni. Ad., adam- 

 bulacralia; Am., anibulacralia ; M., madreporite j M.A.P., mouth-angle plates j 0., odontophor. x 2. 



in /'. primseva. The remaining plates in the interradii are small and identical in 

 shape and ornament with those on the apical surface. 



The groove is widely open and the anibulacralia are seen clearly. They are of 

 the primitive type found in the forms of this lineage. They seem to be opposite 

 throughout the length of the arm drawn. This is the condition in three of the 

 arms of the specimen. In the other two arms the anibulacralia alternate in the 

 distal region. The adambulacralia are only slightly swollen on their orpamented 

 surface. The ornament consists of three groove-spines and stout sub- ambulacra] 

 spines distributed uniformly over the plate. 



