ISCHADITES. 129 
Dictyophyton Danbyi is readily distinguished by its small size and the slighter 
character of its spicular framework from other species of the genus. The speci- 
mens represented on PI. II, figs. 4, 4a, are the type-forms described by M‘Coy, 
now in the Woodwardian Museum at Cambridge. The other specimen, 4), repre- 
sents the concave impressions of two individuals which, with the imperfect casts 
of five others, are exposed on the surface of a small slab of rock, now in the 
Museum of the Geological Society, Burlington House. 
Distribution.—Silurian : Upper-Ludlow-beds at Brigsteer, Benson, Under- 
barrow, Kendal, Westmoreland. 
12. Hyanosrenia Gracinis, Hinde, sp. nov. Plate I, figs. 5, 5 a—5 e. 
The form of the Sponge unknown, the detached spicules referred to the species 
are either simple hexactinellids with the normal number of rays, or modified 
spicules in which one ray or one axis is absent. The vertical axis of the spicules 
is generally longer than the transverse, and varies in length from °675 to °95 mm. 
The transverse rays are generally imperfect ; in some cases they form an oblique 
angle with the vertical axis of the spicule. The spicular rays, with one exception, 
are smooth and tapering, and apparently terminate obtusely. They vary from 
‘05 to “2 mm. in thickness. he rays in one spicule are furnished with obliquely 
projecting spines. 
Associated with the body-spicules are some fragmentary, elongated, cylindrical 
rods, about ‘12 mm. in thickness, with, in places, minute spines disposed spirally, 
which may be portions of anchoring spicules. Both these and the body-spicules 
are siliceous, and their axial canals are usually preserved. 
These various forms of spicules were discovered by Mr. J. Smith, of Kilwin- 
ning, mingled together in a bed of decayed limestone, and it is probable that they 
belong to the same species. 
Distribution.—Silurian: Wenlock strata, near Craven Arms, Shropshire (J. 
Smith). 
13. Iscnapires Linpstremi, Hinde. Plate II, figs. 2, 2 a. 
1884, IscHapires Linpstrmmi, Hinde. Quart. Journ. Geol. Soce., vol. xl, 
pl. xxxvi, fig. 2. 
— Grinpropt, ? Salter, MS. (See Bigsby’s Thesaurus Siluricus, 
p- 4, 1868.) 
