DESCRIPTIONS OF THE BPECIBS. 177 



jecting Blightly upwards above the concave summit ; sinuses long, narrow, and mucfa 

 bent down at their distal extremities; lips not individually prominent, but projecting 

 on account of the natural convexity of the radial plates about the periphery ; 

 radial angle 89°. Deltoid plates quite inconspicuous. Ambulacra moderately narrow, 

 retaining the same width throughout the greater portion of their length ; food- 

 groove very distinct, deep, and moderately wide; side plates at least twenty-six in 

 number on each side of an ambulacrum, square to oblong in form ; outer side plates 

 very minute. Spiracles round, and large for the size of the calyx, situated within 

 the circumscribed depression of the summit, and often with well-marked septa ; anal 

 spiracle pyriform-triangular. Hydrospires unknown in the species proper. Mouth 

 large. Ornament of rather coarse concentric lines. Column unknown. 



Remarks. This species is remarkable for its occurrence in the Eifelien division of 

 the Devonian both in Spain and in Germany 1 . In fact, with the exception of 

 Orophocrinus pentangularis, which occurs in the Carboniferous Limestone of England, 

 Ireland, and Belgium, it is the only Blastoid which has been found in more than one 

 country of Europe. 



The shape of its calyx readily distinguishes it from Pentremitidea angulata which 

 has a decagonal section (PI. IV. figs. 13, 14) ; while the sides of the calyx in P. 

 clavata are flattened or concave (PI. IV. figs. 17, 18 ; PI. V. fig. 17). One of its most 

 striking characters, in which it approaches P. Wachsmut/ii and P.] leda (PI. V. figs. G, 

 12), is the deep incision of the radials and the consequent great length of the ambu- 

 lacra, both points in which it is allied to P. acutangula, Schultze, sp., which we have 

 unfortunately been unable to see. This is most marked in young individuals, which 

 have almost no bodies to the radials at all, as is well shown in Schultze's figures 2 . 

 The shape of the upper part of the calyx also seems to vary a good deal, and we have 

 no Spanish examples in which it is quite so rounded as is represented in Schultze's 

 figures and in our PI. IV. fig. 18. But the form shown on PI. V. fig. 17 is not very 

 different from his largest variety shown in fig. 7, and we have a smaller one with a 

 summit quite as round as the original of his fig. la. 



Localities and Horizon. Nollenbach, near Kerpen : Eifel Limestone, Middle Devo- 

 nian (auctorum), but Lower Devonian (Barrois). Colle, near Sabero, Province of Leon, 

 Spain : Calcaire d'Arnao, Lower Devonian. (Presented by Dr. P. H. Carpenter, F.R.S.) 



Pentremitidea clavata, var. Schultzei, E. & C, var. nov. 

 (PI. V. figs. 3-5.) 

 "We propose to give this varietal name to a Spanish form which we do not feel 

 justified in separating from Schultze's type, though it differs from it much more 



1 Most authors consider the Eifel Limestone as of Middle Devonian age, but Barrois places it in the 

 Lower Devonian. 



2 Denkschr. k. Akad. Wissensch. Wien, 1867, Bd. sxvi. Abth. 2, t. 13. f. 7 C. 



2 A 



