DESCRIPTIONS OF THE SPECIES. 17.", 



merit of fine thread-like striae, parallel to the margins of the plates. Column of vi rj 

 minute joints. 



Remarks. Pentremitidea Paillettei may he regarded both as the type of the genua 



and as the representative of its pyriform species. There is a gradual transition from 

 P. Paillettei through /'. Lusitanica (PI. V. fig. 20) and P. Eifel&nm (PI. V. fig. t) 

 to the equally typical calyx of P. clavata (PI. IV. fig. 18). The very pentalohate 

 character of the calyx, when seen in section, is a striking feature of this species 

 (PI. IV. figs. 8, 9), and is more pronounced than in its nearest allies P. Lusitanica 

 (PI. IV. fig. 12) and P. Eifelensis (PI. V. fig. 2), especially the latter. The ambu- 

 lacra and radial sinuses are relatively much shorter than in the former type, and the 

 radial angle differs a good deal (PI. IV. figs. 9, 11). The calyx is also more slender, 

 and lacks the distension visible in P. Lusitanica just below the lips of the radial 

 plates; while the general form and the wider sinuses separate P. Paillettei from 

 P. Eifelensis (PI. V. figs. 1, 2). 



Owing to a curious error the former species has been referred to as Pentremites 

 Dutertrii in Roemer's well-known Monograph l . He gives as a reference L'Institut, 

 1844, xii. p. 21G, but we find that the Blastoid mentioned on this page is really 

 P. Paillettei, the name Dutertrii being employed for a species of Leptama. 



Locality and Horizon. Colle near Sabero, province of Leon, Spain: Calcaire 

 d'Arnao, Lower Devonian. [De Verneuil and Barrois 2 also give Ferrofies, Anurias 

 in the Calcaire de Ferrones, and the latter further mentions Luanco, in the Calcaire 

 de Moniello.] 



Pentremitidea Lusitanica, E. & C. 

 (PL IV. figs. 11, 12, 15; PI. V. fig. 20; PI. X. fig. 1.) 

 Pentremitidea Lusitanica, E. & C, Ann. & Mag. Nat. Hist. 1882, vol. is. p. 2:2.). 



Sp. Char. Calyx clavate-pyriform, elongate, expanding gradually upwards ; base 

 elongate and pointed ; summit truncate. Basal plates only a trifle shorter than the 

 radials, forming an elongated cup, the lower portion of each plate bearing a strong 

 central ridge, which assists in forming the ornamentation, but a transverse fold is not 

 present. Radial plates rather narrow, elongate, and arched from the lips downwards 

 along the body of each plate ; three impressed lines diverge from each lip, one to 

 each infero-lateral angle, and one along the middle line ; sinuses with sharp erect 

 margins, making an angle of about 134° with the truncated summit ; lips a little 

 thickened and simply rounded. Ambulacra elongately petaloid ; lancet-plates broad, 

 almost wholly filling up the sinuses; side plates large and oblong, their outer 

 margins rounded, about fifteen on each side of an ambulacrum ; outer side plates 

 narrow, bent down at a much greater angle than the side plates. Spiracles mere 

 elongated slits ; anal spiracle rounded, or inclined to circular. Ornament of fine 



1 Arehiv f. Natnrgesch. 1851, Jahrg. xvii. Bd. ii. p. 37-1. 



2 Jliiiu. Soc. Geol. du Xord, tome ii. Mom. 1, p. 225. 



