FLOKIDAN BRYOZOA. 5 



not be considered as a difference of any specifical value. In comparing these iigures, 

 especially that of the back side, tig. 4, with my illustrations of the Scandinavian 

 Crisice 1 ), it will be seen that they agree with each other in all essential points. The 

 museum in Stockholm has also received the same form of this species from Gulf S:t 

 Vincent, Australia, throngh the Godeffroy-museum, and this species may thus be truly 

 named cosmopolitan. At Florida it is captured at from 7 — 60 fathoms. 

 The family of 



DIASTOPORID.E 



we lind here represented by the Scandinavian and Crag-form 



Diastopora repens (Pl. I, tig. 6) 



in its well-known, ramified form creeping on the Terebratula eubensis from 306 fathoms. 

 Figure 6 gives the inöst common and typieal appearance of this species; but the bran- 

 ches are continually growing broader and broader in the younger parts, and as this 

 can be the case even in a higher degree and sometimes much nearer to the origin, the 

 colony can assume a very different appearance. In all the specimens the zocecia are 

 broken in the convex level of the creeping colony, or only a little raised at their 

 distal end. The basal laminar expansion of the thin ectocyst, along the branches, is 

 prickled by pores like the wall of the zooecia, whose white, more calcareous, limits 

 are clearly conspicuous. Sometimes the branches of the bryozoary are very finely 

 striated by transverse-growing lines. 



In all its variations, this species reminds us not only of the Crag-formation, but 

 also, as even Busk was ready to believe, of the cretaceous period, when the Diastopora 

 ramosa of Michelin was living. And, in the descriptions and tigures, can we lind 

 scarcely any specifical difference. The Proboscina depressa of D'Orbigny 2 ) ought, per- 

 haps, to be referred to the sann: species. The only differences should be taken from 

 the form of the colony, which is quite too much varying, or from the degree, in which 

 the zooecia are raised at their distal end. But as regards the latter point, I find the 

 Scandinavian D. repens, in an uninjured state, present the zooecia raised to a third 

 part of their length. 



Amongst the living forms, I can-not see more reason to distinguish this from the 

 Criserpia dichotoma, D'Orb. 3 ), who is described as living in the great depths at the 

 Falkland-islands. 



In determining the species of the family 



TUBULIPORIDtE, 



I must refer the reader to my former papers *), where it is shown, how the genera, 

 that are proposed in this family, are, throngh their modes of development, connected 



>) Öfvers. Vet.-Akad. Förh., Stock., 1864. 



2 ) Pal. Franc. Terr. Cret., t. V., p. 849. 



3 ) Voy. dans 1'Araér. mérid., Polypiers, p. 19; tab. IX tigs. 7 — 13. 



4 ) Krit. Fört. Skand. Bryoz. Öfvers. Vet.-Akad. Förh. 1866, pp. 434 etc. 



