Mr, F. M'Coy on some new Palaeozoic Echinodermata. 249 



minent tubercles over the arm- bases and great plates on the 

 vertex ; but it differs from those^ besides the great size of the 

 visceral ])ortion^ very obviously in the greater proportional length 

 and less width of the costals, most remarkably of the second 

 series. 



Rare in the carboniferous limestone of BoUand. 



{Col. University of Cambridge.) 



Eucahjptrocrinus polydactylus (M'Coy) . 

 Sp. Char. (Small concave ^je/rfs not seen) ; first-costals hexagonal, 

 convex, one-third wider than long, each supporting a quadran- 

 gular second costal, nearly twice as wide as long, its width nearly 

 one-third less than that of the first costal ; on each second costal 

 rests a pentagonal scapular joint, equalling the second costal 

 in width but exceeding it in depth ; on each scapula rest two 

 hexagonal _/??'S^ arm-joints nearly equ^alling the scapul?e in w^idth 

 and depth, and joining by their inner margins (so that the in- 

 terbrachial plates cannot rest on the scapulae) ; on each of these 

 rests a smaller hexagonal second arm-joint, from each of which 

 arise two hands of four or five fingers each; between the two 

 second arm-joints of each arm is a small heptagonal inter- 

 hrachial plate, its inferior pointed end resting on the two first 

 arm-joints, and its truncated upper end supporting the small 

 lozenge-shaped plate pecu.liar to this genus ; circumscribed by 

 the first and second costal, scapular, and first arm-plates, are 

 the five large, equal, convex, nine-sided intercostal plates, each 

 supporting on its upper edge a vertical row of three hexagonal 

 interbrachial plates. Diameter of cup about 1^ inch. 



Besides the differences of proportion in the various plates 

 which may be gathered from the description, this differs from 

 the Hijpanthocrinus (Eiicalyptrocrinus) decorus (Phil.) and E. ro- 

 saceus (Gold.) in the lateral union of the first arm-joints, and 

 their supporting the interbrachial plates, instead of the scapulae, 

 the scapulae consequently being pointed above ; also in the plates 

 resting on the intercostal not being bifid, and most remarkably 

 from all of the genus in the number of fingers, there being but 

 two to each hand in the other species. 



Rare in the Wenlock limestone of Dudley. 



{Col. A cast in the University collection at Cambridge.) 



Blastoidea. 



Pentremites campanulatus (M'Coy). 

 Sp. Char. Bell-shaped, base as wide as the body; pseudambu- 

 lacra* wide above, tapering to the angles at the base ; trans- 



* I use the word pseudambulacra liere to designate those poriferous rows 

 in Pentremites, &c. whicli resemble ambulacra, but the pores of" which are 



