POTERIOCRINID^E.— SYNBATHOCRINUS. 93 



Genus 2. Synbathocrinus. {Phillips.) 



Definition. — Dovso-central plate undivided, (1) ; on which rest five broad lateral 

 plates, (2). 



Professor Phillips was the first to notice this curious crinoid and to found on it his 

 genus Synhathocrimis. Hitherto only one species has been discovered, but this single 

 species unites in itself characters which make it an intermediate and connecting link 

 between several other genera. In its pentagonal undivided dorso-central plate, and 

 broad lateral plates it is homologous with the Plalycrini; the structure of its rays and 

 their mode of articulation to the ray bearing plates, connect it with the Poteriocrini ; 

 while in its contracted internal cavity for the digestive organs, and tumid plates, we see 

 its remote approach to the Apiocrini. 



1. Species. Synbathocrinus conicus. (Phillips.) 

 Fl. 11, Fij. 5 a, 5b, 5 c, 5 d, and 5 e. 



Definition. — Dorso-central plate pentagonal; perisomic or lateral plates five ; rays 

 five; column unknown. 



Synonymes and References. 



Synbathocrinus conicus. — Phill. Geol. of York. pi. 4,f. 12, and 1.3. 

 ^Aust. Ann. Nat. Hist. vol. 10, p. 108. 



Formation and Localities. 



The Mountain limestone, BoUand ; Barry Island, in the Bristol Channel ; Hook 

 Point, Wexford. 



