LEPIDESTHES. 199 



Size. — Length from 3 to 12 mm. 



Localities. — In the Barnstaple Athenseum is a specimen from Top Orchard ; in 

 the Porter Collection five from Pilton, one from Roborough, and one from 

 Poleshill ; and in my Collection one from Pouch Bridge, one from Kingdon's 

 Shirwell, and one from Laticosta Cave, Baggy. 



Remarks. — Our specimens being chiefly casts do not show any cellular 

 structure, and only in two cases faint signs of longitudinal striation. From their 

 form and general character, however, there can be no doubt that they belong to 

 the genus Gomulites. In the smaller specimens the annulations are, as a rule, fairly 

 regular (though occasionally they appear to vanish over a portion of the circum- 

 ference) and the shape is a very elongate cone, sometimes straight, sometimes 

 recurved. In one or two specimens, which are larger, the annulations have 

 become very irregular and confused, the shape is a broader cone, and there is a 

 more rapid expansion near the mouth or broader end. I have not observed any 

 signs of their being attached to other bodies, but it is most likely that they were 

 so attached by the apex. 



From the Silurian G. serpularius, Schlotheim, 1 our fossils are widely different 

 in size and the width of their annuli, and they also appear to differ in the same 

 respects, though in a less degree, from G. proprius, Hall, 2 and the other species 

 described by him. A comparison of Hall's figures 3 is interesting, as they show 

 that the same variations with age occurred in his species as in ours. 



ECHINODBRMATA. 



1. Class— ECHINOIDEA, Breyn, 1732. 



1. Sub-class— PALECHINOIDEA, Zittel, 1890. 



1. Order— PERISCHOECHINIM], M'Coy, 1849. 



I. Family — Melonitid^, Zittel, 1890. 



1. Genus — Lepidesthes, Meeh and Worthen, 1868. 



" Subspheroidal ; interambulacral areas narrow, with plates imbricating from 

 below upwards, and from the middle outwards ; ambulacral areas very wide, 

 composed of numerous small pieces scarcely differing in form, and all imbricating 

 from above downwards, the lower edges of each lapping upon the next series 



1 1820, Schlotheim, ' Petrefact.,' p. 378, pi. xxix, fig. 7. 



2 1888, Hall, ' Pal. New York,' vol. v, pt. 2, Suppt., p. 19, pi. cxvi, figs. 1—21. 



3 Ibid., pis. cxv, cxvi, cxvi a. 



