436 TUBULIPORIDJE. 



b. Zoarium partially erect and free. 



(Subgenus Proboscina, Smitt.) 



STOMATOPORA INCRASSATA, Smitt. 



Plate LIX. figs. 2, 3. 



TUBULIPORA INCRASSATA (subgcn. Proboscina), Smitt, loc. cit. 402 & 458, pi. v. 



figs. 1-7 ; GEfv. K. Vet.-Ak. Fork 1871, 1119, pi. xx. fig. 8. 

 ALECTO RETIFORMIS, Hincks, Supplera. Devon & Cornw. Oat, Ann. N. H. 



ser. 4,iv. 81 (August 1871). 

 ?FILISPARSA INCRASSATA, If Orb. Pal. Fr. loc. cit. 817. 



Zoarium white, minutely punctate, and often grooved 

 transversely; much branched, the ramification com- 

 pact ; branches depressed, dichotomous, but not 

 widely divergent, often of great breadth, expanding de- 

 cidedly upwards, anastomosing freely, the reticulations 

 generally elongate and pointed at both extremities. 

 Zocecia usually disposed without much regularity, some- 

 times two or three abreast, the anterior extremity erect 

 and free. The zoarium frequently rises into short 

 cylindrical processes with a cellular apex. 



SPECIMENS of this fine and very characteristic species 

 measure about an inch across, and form somewhat circular 

 patches. In habit it is stout and compact ; the branches 

 lie rather close together, and meet and anastomose freely, 

 so that the zoarium is always more or less rctiform. The 

 fenestrse are pretty uniform in figure ; they are generally 

 narrow-elongate, and produced into a point both above and 

 below. The branches expand very rapidly upwards, and as 

 they are placed near together, the projecting points above 

 come into contact, and unite so as to form the meshes 

 of the network. There is no regularity in the arrange- 

 ment of the zooecia, such as we meet with in S. major. 

 The zoarium is always white. The tendency to form erect 

 shoots is much more marked in some specimens than 

 in others. At times the zoarium is studded over witli 



