38 ^Iv. II. J. Carter on 



are about 1 in. long by l-16t]i in. in diameter, singly or 

 bifurcated. 



13. Sycothamnus alcyoncellum^ H. 

 Sycothammis alcyoncellum, H., Kalkschwamme, Atlas, Taf. Iviii. iig. 5. 



Easily recognized by its hollow, cylindrically-branched, 

 coral-like form, checkered on the surface by spirally-inter- 

 crossing lines extending round the cylinder, Avith holes at the 

 points of intersection. There is nearly as much as would 

 fill a half-pint cup of this, all of which is in a fragmentary 

 condition, wherein the naked and peristomed varieties {S. 

 arboreum, H., fig. 7) appear to be mixed. In some of the 

 " mortar-spicules " which Hiickel describes in his text-book 

 but does not represent in the ' Atlas,' the lanciform ends are 

 serrated, like those of his Leucandra sacchavata (Taf. xxxviii. 

 fig. 13). 



14. TeichoneUa labyrintliica^ Carter. 



Teichonella labyrinthica, Carter, ' Annals/ 1878, vol. ii. p. 37, pi. ii. 

 figs. 6-10. 



There are several specimens of this species, respectively 

 complete and fragmentary, which enable me to modify to a 

 certain extent what I stated formerly respecting it, inasmuch 

 as the less involuted specimens show that it is goblet-shaped 

 in general form and wo^ simply " vallate," like T.prolifera {op. 

 et he. cif.) ; also that a q^iadrhnA'iixXQ forms part of its spicu- 

 lation ; hence these additional facts render it necessary that 

 it should be relegated to the vicinity of Grantia coinpressa^ 

 where its generic name might be changed from ^^Teichonella " 

 to '"'' Grantia.'''' It was the absence of the lower part and the 

 imperfect state of the specimen generally that led me in the first 

 instance to call it " vallate." As the structure of the stem has 

 not already been noticed, it may be here stated that it consists 

 of a solid, cylindrical, somewhat compressed mass of spicules, 

 chiefly fine triradiates with very long shafts, and echi- 

 nated with large, long, curved, fusiform acerates on the sur- 

 face, which are partly free and partly imbedded in the general 

 fabric. The largest specimen is 2y in. high, not including 

 the stem, and 3 in. across the brim of the head when invo- 

 luted ; while the maximum thickness of the wall, which is 

 towards the base, is 3-24ths in., diminishing gradually to- 

 wards the border. The stem, wliich is somewhat contracted 

 near the middle, is an inch long and about f in. thick, ex- 

 panding upwards into the wall of the head and downwards 

 upon the object on which it has grown. One cannot help 

 seeing in the compressed form of the involuted folds of the 



