224 Messrs. R. Etlieridge, Juii., and P. H. Carpenter on 



margins of the various plates, those on the lower portions of 

 the basal plates being of a peculiar V-sha])eLl pattern. 



Ohs. This is a well-marked species, which may be at once 

 distinguished i\on\ Penlremitidea clavata^ Scliultze, P. acutan- 

 gula, Schultze, P. ScJiulfzii, de Verneuil, and the two species 

 next to be described, by the outline of the calyx. It differs 

 sharply from P. Pailletti, the type of the genus, in the lobation 

 of the radials, the smaller angle of inclination of the radial 

 sinuses, and in their shorter length. P. lusitanica to a cer- 

 tain extent resembles P. eifelensis^ F. E-omer, of which 

 Schultze has given a figure. Indeed, this species is its closest 

 ally; but here, again, the radial angle is quite different, and 

 gives to the Eifel s|)ecies the appearance of possessing a longer 

 and more curved sinus in each radial, and a very much less 

 breadth across the peristome. 



Loc. and Horizon. Asturias, Spain ; Devonian (Mus. Nat. 

 History). 



Pentremitidea angulata^ sp. nov. 



Sp. cJiar. Calyx pentagonal obpyriform, enlarging upwards 

 to the distal extremities of the ambulacra, which are nearly 

 equatorial ; section decagonal, without re-entering angles be- 

 tween the ambulacra ; summit small. Basal plates a little 

 less than half the length of the radials, forming a strongly 

 triangular cup, Vvith three prominent angles, one correspon- 

 ding to an interradius, the two others opposite ambulacra ; 

 surface of the plates between the angles hollowed out; base 

 of attachment for the column triangular. Radial plates elon- 

 gated, their surfaces in two planes which cut one another at 

 the equatorial line of the calyx : the upper, sloping away to 

 the summit, consists of the limbs ; the lower, or the body 

 below the radial lips, extends to the basiradial sutures and 

 is hollowed out ; a median ridge passes downwards from each 

 lip to the basiradial suture, whilst the angle produced by the 

 union of the two planes forms the greatest periphery or 

 equator of the calyx. The lateral margins of the radial limbs 

 are not placed in depressions, but the line of union of every 

 two adjacent limbs forms a prominent angle of the calyx. 

 Radial sinuses very narrow and long, with prominent lips. 

 Oral plates quite apical. Ambulacra long and very narroAv, 

 maintaining almost the same width throughout their wliole 

 course ; lancet-plates nearl}- as wide as the sinuses ,• side 

 plates about twenty in number on each side of an ambulacrum, 

 short but broad. Spiracles close round the mouth; anal 

 spiracle with a prominent outer n)argin. Surface ornamented 

 in the usual way. 



