F. R. Cowper Reed — Salter's Undescribed Species. 339 



1888. Sphcerospongia hospitalis, G. J. Hinde: Mon. Brit. Foss. Sponges (PaliBont. 



Soc), p. 182. 

 1888. Sphmrospongia hospitalis, Etheridge : Cat. Brit. Foss., pt. i, p. 3. 

 1891. Sphcerospongia hospitalis, "Woods : Cat. Type Foss. Woodw. Mus., p. 2. 

 1880-97. Sphcerospongia hospitalis, Roemer (Freeh): Leth. Geog., Th. i, Bd. 1, 



p. 296. 



The original specimen, whicli came from the Middle Bala of the 

 Onny Eiver, is unfortunately missing, as Mr. Woods (op. cit. supra) 

 mentions. But we possess four other specimens in the Woodwardian 

 Museum from the same locality and horizon, two of which date back 

 to Salter's time. Two of these specimens are external casts of the 

 surface, and the other two show the surface itself, one being a nearly 

 •complete individual. 



Diagnosis. — Body globular or ovoid ; base or stalk unknown. 

 Surface composed of numerous closely fitting, convex, hexagonal 

 plates, about 1'5 mm in' diameter. Each plate has its individual 

 convexity, and is ornamented with small irregular radiating ridges, 

 particularly distinct near the edges of the plates. The centre of 

 many of the plates is seen to be marked by a small tubercle, but it 

 is generally very indistinct. No different plates nor openings visible, 

 but indications of closely placed radiating pillars inside the body. 



Measurements. — Diameters of ovoid figured specimen, 30 mm. 

 and 25 mm. ; five plates in a space of 8 mm. 



Eemabks. — The affinities of this species have been briefly mentioned 

 by Nicholson, Etheridge, and Hinde in the references above given. 

 The probable relations to Pasceolus are generally recognized in 

 the shape, character of surface, and ornamentation of the plates ; 

 but some doubts must remain as to the true generic position of 

 this species until we are better acquainted with its internal structure. 

 Hinde (op. cit.) has declared that it cannot be left in the genus 

 Sphcerospongia, of which Sph. tessellata (Phill.) is the type. 



Graptotheoa oatenulata, Salter. (PI. XVni, Fig. 8.) 



1873. Graptotheoa catenulata, n.sp., Salter: Cat. Camb. Sil. Foss. Woodw. Mus., 



p. 171 (« 986). 

 1891. Graptotheoa catenulata, "Woods: Cat. Type Foss. "Woodw. Mus., p. 120. 



There is only Salter's original specimen (a 986) of this curious 

 fossil, which he attributed to the Pteropoda, giving the new generic 

 name of GraptotJieca. This genus is not mentioned by Zittel or 

 in any subsequent palseontological v?ork, so far as I am aware. 

 It is difficult to see why Salter assigned it to such a zoological 

 position, as it exhibits no peculiarly pteropodal characters. The 

 specimen is from the Lower Ludlow of Leintwardine, and is of 

 an elongated subtriangular form, acutely pointed at one end, the 

 two adjacent sides making an angle of about 30°. The other end 

 is broad, but its true shape cannot be made out owing to the poor 

 state of preservation. The surface is marked with 8 or 9 strong 

 raised lines parallel to the second longest side; of these the first 

 4 or 5 nearest the margin are equidistant, but the others are less 

 regular and slightly curved. Some of the lines bifurcate near 



