FLORIDAN BRYOZOA. / 



granular calcification, thus making an escharine form out of the formerly flustrine spe- 

 cies. The other colony, brought up by Pourtales, is raised at two points into stems 

 of the Vincularian forrn (fig. 61), otherwise retaining the same constitution of the zoce- 

 cia and avicularia. These stems, if taken alone, by the anthors, without doubt, would 

 have been brought in adifferent systematical series, from that into which they would 

 place the encrusting stage. 



The zooecia, as deprived of their primary ectocyst x ), have their front in the 

 middle raised a little between the two above-named furrows. The apertural area has 

 a trapezoidal form, with rounded distal end, broader in its proximal part, with roun- 

 ded corners and the proximal margin concave. As to its dimensions I have measured 

 one area 0,29 mm. long and 0,22 mm. in its greatest breadth: thus the length is to 

 the breadth, about as 4 to 3. If these areas had been a little more elongated, one 

 could expect to have reason for uniting this species with Vincularia elegans, D'Orb. 2 ), 

 from the Falkland-islands, because the linguiform zooecia, if deprived of their primary 

 ectocyst, have their borders raised, the front side sloping inwards against the above- 

 named furrows, thus the description, given by D'Orbigny, would suit it very well; but 

 his fignres present the areas of a form, that seems to come nearer to the Vinc. ornata, 

 Busk, only wanting the denticles of that form, which, perhaps, have escaped the at- 

 tention of D'Orbigny. 



Now my Plate I, as it is composed of very different forms, I hope it will show,, 

 that neither the agreement, nor the diversity in the manner of building their colonies, 

 will give any warrant as to the natural affinities of the higher bryozoa. If that be 

 granted, I will have fewer opponents against my exposition of the following families; 

 yet nobody deeper than myself can feel the insufficiency of our present knowledge as 

 to the limits, of the natural series. 



MEMBRANIPORIDvE. 



Membranipora lineata 3 ) (Pl. II, fig. 62). 



Of this species Pourtales has taken a very typical, though for the most part 

 died and unclean colony, growing on a piece of coral from 42 fathoms at Florida. 

 The only remarkable difference from the oldknown european form would be the size 

 of the ocecia, about 0,21 mm. broad, while the zooecia in that respect resemble the 

 european form. Thus it would hold an intermediate position between Membr. craticula 

 and the true M. lineata; but, as I have shown (Öfvers. Vet. Akad. Förh. 1867, pag. 

 391), these two forms are to be regarded as variations of age and development of the 

 same species. 



1 ) The drawer has shown one in the middle of the shadowed part of the raised stem (fig. 61); the other 

 zooecia there were either coveved by their primary ectocyst or in an oblique position. Yet that clear 

 zocecion, in a flexure of the stem, has got a more than usually abbieviated form. 



2 ) Voy. d. UAmér. mer., Tom. V, part 4, Zooph., Div. 1, Bryoz., pag. 21, tab. IX, figs. 25 — 28. 



3 ) Of the synonyms see: Öfvers. Vet. Akad. Förh. 1867, pag. 364. 



