CAULOPHACUS. 85 



CAULOPHACUS F. E. Sch. 



Balanites, F. E. Sch., '86; '87, pp. 122,:372. 



Balanelht, F. E. Scir., '87 (postscrip>t). 



Caulophacus, F. E. Sch., '86; '87, pp. 124, 373; '97, p. 520. 



Caulophacids of cup-like or fungiform body ; solitary (always ?). 

 Pareiicliymalia chiefly diactiiis but iiicludiug also large regular 

 hexactins. Dermalia, liexactinic pinules ; on the stalk these may 

 be replaced by pentactinic forms. Gastralia, either liexactinic or 

 pentactinic pinules. Discohexaster j^resent in varying forms; with- 

 out strobiloplumicome. 



Noteworthy is the fact that in most species (probably all 

 except C. loiifolium n. sp.) of the genus the unpaired ray of the 

 pentactinic hypode.rmalia and hypogastralia is beset with prickles 

 throughout neaily its entire length. Further, in most species (the 

 exception being again G. lotifolium) the discohexaster occurs in 

 tw^o easily distinguishable types, which I shall call, for the sake 

 of easy reference, the 'pachydiscohexaüev and the lophodiscohexaster. 

 The former has thick, thorny or barbed, widely diverging termi- 

 nals ; it is frequently hemihexactinose or hexactinose, and in some 

 species occurs in the hexactinose form only. The latter has nmcli 

 thinner terminals, which form a distinctly separate tuft of bell- 

 like or elongate-conical shape to each principal. 



The follow^ing is a key to the five known species of this 

 o;enus : 



