176 CATALOGUE OF THE BLASTOIDEA. 



lancet-plates small, scarcely occupying the entire width of the sinuses ; side plates 

 about fifteen in number, large and strong, projecting above the margins of the 

 sinuses, and somewhat petaloid in shape. Deltoid plates almost entirely concealed 

 by the radial limbs, each showing but little more than a well-marked median ridge, 

 which partially separates the spiracles at its sides. Mouth of moderate size. Orna- 

 ment of strong and coarse concentric lines. Column unknown. 



Remarks. The outline of the calyx readily distinguishes this species of Pentremitidea 

 from the three which were obtained from the Eifel Limestone by Schultze. It is 

 pyramidal from the base to the radial lips, while the latter are clavate and obpyri- 

 form. Its pentagonal section will prevent its being confounded with the decagonal 

 P. angulata, nobis (PI. IV. fig. 14), which has the interradial sutures raised, and not 

 depressed as in P. Malladai (PL V. fig. 19). The latter has smaller deltoids than 

 P. similis, nobis (PI. V. fig. 16), while its calycular outline is also different. The longer, 

 narrower, and more curved ambulacra and shorter base separate it from P. Lusitatiica 

 (PI. V. fig. 20) ; while, on the other hand, it has not the broadly truncated summit 

 and narrow elongated base of P. Paillettei (PI. IV. fig. 9). 



When originally describing Pentremitidea similis (PI. X. figs. 2, 4) we noted the 

 resemblance in the general form of its calyx to that of Orophocrhms. P. Malladai, 

 on the other hand, exhibits a digression towards Cadaster ; for the pyramidal outline 

 of the calyx is not at all unlike that presented by C. Ilindei, nobis (PI. XII. 

 figs. 5, 6), and even more like that of C. pyramidatus (PI. XII. figs. 2, 3). 



We have connected the name of this species with that of Don Lucas Mallada, of 

 the Spanish Geological Survey, to whom we are indebted for the opportunity of 

 describing both it and also some other species from Spain. 



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

 d'Arnao, Lower Devonian. (Presented by Dr. P. H. Carpenter, F.Ii.S.) 



Pentremitidea clavata, Schultze, sp. 

 (PI. IV. figs. 17, 18 ; PI. V. figs. 3-5, 17.) 



Pentremites clavatus, Schultze, Deukschr. k. Akad. Wissenscli. 18G7, Bd. xxvi. Abth. 2, 



p. 225, t. 13. f. 7a-e. 

 Pentremitidea clavata, E & C, Ann. & Mag. Nat. Hist. 1882, vol. ix. p. 223. 



Sp. Char. Calyx club-shaped ; base funnel-like, rapidly attenuating and triangular ; 

 summit contracted, small, and concave ; periphery almost equatorial where the sides 

 of the pentagon are flat or slightly concave. Basal plates carinate in the middle 

 line. Radial plates oblong quadrangular, their surfaces in two planes, the upper 

 sloping away to the summit, and consisting of the limbs, which are more than double 

 the length of the bodies ; the second plane in each plate is formed by the bodies 

 below the lips, and is concave or hollowed out; interradial sutures not placed in 

 depressions ; apices or proximal ends of the limbs prominent and sometimes pro- 



