1038 bh. j. w. GnEGOBY on thh olassipioation [Dec. 15, 



Genus 2. Fueoastek, Stiirtz, 1886 [15. p. 79]. 



Diaynosis. — Disc circular small. Arms short, narrow, slightly- 

 flexible, tapering gradually. Ambulacral ossicles of a long central 

 body and two sliort wings, which are attached only to the anterior 

 corner of the ossicle. 



Distribution. — Lower Devonian, Biindenbach. 



Type species. — Furcaster 2Kda;ozoims, Stiirtz '. 



Remarks. — In Stiirtz's description he refers to the existence in 

 this genus of ventral arm-plates, and even figures them. His 

 type specimens are now in the British Museum, but I cannot 

 verify the existence of any ventral arm-plates. His type (B.iM. 

 B 3805), for example, seems to me to show almost conclusively 

 that an open furrow ran along the underside of the arm. 



Genus 3. Palastkopeoten, Stiirtz, 1886 [15. p. 88]. 



Diagnosis. — Disc circular, large (badly preserved in the speci- 

 mens ; probably originally soft and irregular). Arms thieic, broad, 

 and somewhat lanceolate in shape. Ambulacral ossicles narrow, 

 the lateral wings resting on the whole body of the ossicle. 



Distribution.— Jjowev Devonian, Bundenbach. 



Ti/2>e species. — Palastropecten zitteli, Stiirtz, 1886 [15]. 



Af/anaster, sp.. Miller & Gurley [12. p. 57, pi. ix. figs. 10, 

 11], seems to me to be allied to Lapworthwa, and at least a 

 member of the same family. It apparently has no ventral arm- 

 plates, but an open furrow, and thus differs widely from Aganuster 

 It is probably a new genus. 



Family 3. Eoluididje. 



Diagnosis. — Streptophiuraj with the ambulacral ossicles united 

 to form vertebral ossicles. Ventral arm-plates present, but there 

 are no buccal shields. (Dorsal arm-plates present only in the 

 highest genus.) 



Remarls. — This family includes three Devonian genera, v^ hich 

 differ from the previous families of .this order by the presence of 

 ventral arm -plates and by having vertebral ossicles, which arti- 

 culate (? always) by simple rounded pits and processes. The 

 family differs from living Streptophinra) by the absence of buccal 

 shields and the simplicity of the oral armature. 



Genus 1. Eoluidia, Stiirtz, 1886 [15. p. 89]. 



Diagnosis. — Disc rather lai'ge ; the interbrachial outlines are 

 deeply concave. Each synguatii consists of ])airs of mouth-frames 

 and jaws ; a jaw-plate is present. The vertebral ossicles are small 

 and the union of the two lateral elements incomplete ; the lateral 



' Tbe Protasier daoulasensis, Davy (Bull. Soc. g(Sol. Franca, eer. 3, vol. xit. 

 pp. 182-187), is au ally of Furcaster. 



