CARTEEELLA.— ISOEAPHINIA. 55 



45 mm. in width at the summit; a smaller form is only 20 mm. in width and 

 160 mm. in length. In some examples the width of the cup at the summit but 

 slightly exceeds the width of the stem. 



The vertical canals penetrating the stem are "7 mm. in width and irregularly 

 disposed. In some examples the surface of the stem exhibits sinuous vertical canals. 

 The apertures of the horizontal canals, about -5 mm. in width, are present both on 

 the exterior of the cup and the stem ; they are very closely set, oval or circular in 

 form, and bounded by the spicules of the mesh. 



The spicules forming the cup and the exterior portion of the stem are -0675 mm. 

 in thickness ; they are disposed in close contact in the direction of the length of the 

 sponge. The spicules of the interior of the stem are much more slender than those 

 near the outer surface, and they are loosely connected together by their bifurcated 

 extremities. In length they vary between •787 and 1-575 mm. 



The specimens are not uncommon, though perfect examples are rare. 



Distribution. Upper Green Sand : Warminster, Wiltshire. 



Genus CARTERELLA, Zittel, 1878. 



Carterella cylindrica, Zitt. 

 1878. Carterella cylindrica, Zitt. Studien, II Ab. p. 68, t. 2. f. 7 and t. 7. f. 2. 

 Distribution. Upper Green Sand: Kelheim, near Regensburg [Zittel's coll.). 



Carterella spiculigera, Boemer, sp. 



1864. Jerea spiculigera, F. A. Roemer, Palaeont. Bd. 13, p. 34, 1. 12. f. 6. 

 1878. Eulespongia, Quenst. Petref. Bd. 5, p. 414, t. 135. f. 1, 2. 

 1878. Carterella spiculigera, Zitt. Studien, II Ab. p. 69, t. 7. f. 2. 



Detached spicules of this species from Zittel's collection. 

 Distribution. Upper Chalk : Ahlten, Hanover. 



Genus ISORAPHINIA, Zittel, 1878. 



IsoRAPHiNiA TEXTA, Roemer, sp. (Plate X. figs. 3, 3 a, 3 b.) 



1864. Siphonoccelia texta, Roemer, Palaeont. Bd. 13, p. 29, t. 10. f. 11. 

 1878. Eulespongia texta, Quenst. Petref. Bd. 5, p. 417, t. 135. f. 3-7. 

 1878. Isoraphinia texta, Zitt. Studien, II Ab. p. 69, t. 5. f. 8 and t. 7. f. 3. 



Body of sponge cylindrical, the lower portion gradually tapering to a simple 

 rounded stem ; the summit is truncate or depressed conical. Fairly large specimens 

 measure 230 mm. in length by 54 mm. in width. 



The cloacal tube is nearly cylindrical, and extends to the lower portion of the body 



