FLORIDAN BRYOZOA. 13 



But frora this it is distinguished by the calcareous ribs that run along the sides of the 

 zooecia as well as on the interstitial walls. This is a feature that I have else seen as 

 more characteristic of the Discoporella verrucaria, especially as a preliminary growth 

 by the formation of a new ooecion över the older one. Yet, although I have never 

 seen it on the Scandinavian Discoporella crassiuscula, at least in the same degree of 

 development as here, it seems me very doubtful, that such a biological feature should 

 make a specifical difference. But as long as a difference remains in any wise unex- 

 plained, of course in a faunistic work we must respect it, even if it seems to be so 

 unimportant, that we have reason to hope, that further investigations will make the 

 distinction unnatural, by showing the intermediate forms. 



As to the relations of the 



CHILOSTOMATA 



to the other orders as well as to each other, I have formerly ') shown, how they are 

 connected, in two ways, with the Ctenostomata, viz. through the JEteidce connected with 

 the Vesiculariece and through the Membraniporidce, as well as through the lower forms 

 of Flustridce, with the Halcyonellece 2 ). The JEteidoe, furthermore, connect them with the 

 Cyclostomata; and, in their last stages of evolution, even the Escharine and Celleporine 

 types converg^ towards the structure of that order. Nearest to the JEteidce are to be 

 placed the 



CELLULARIE.E, 



of which family Pourtales, in his Floridan excursions, took four forms, two of whieh 

 he has himself described as being species of the genus Canda. Now I have shown 3 ) 

 that most of the generic divisions, whieh were established within the limits of the ge- 

 nus Cellularia, such as I have recoiastructed it from the form of the zooecium, should 

 be rejoined, for the sake of all the intermediate forms and the variations in the deve- 

 lopment of the proposed characteristics. But Eucratea, Gemellaria and Caberea I have 

 retained as more expressed and isolated deviations from the Cellularian type; the first, 

 viz. in its divergence' towards the jEteidai, the second in its pureness and want of most 

 of the secondary colonial organs, the third as a divergence towards the Membranipori- 

 dva in connexion with a peeuliar form of stem. 



Among the Floridan Bryozoa, sent me for examination, I lind three forms be- 

 longing to the true genus Cellularia, and of these I will nanie one 



Cellularia pusilla (Pl. V, figs. 32 — 34), 



as it seems to me still to be underscribed. It may thus be charaeterized : 



') Bryozoa marina, and Krit. Fört., Öfvers. K. Vet.-Akad. Förhandl., 1866, p. 517; 1867, p. 294, 460 and 



470. 

 1 ) In the arctic sea, at Spetsbergen, in the year 1868, I have tbuud an Alcyonidium that I have named A. 



(Flustrella) corniculatum, which comes very near the A. {Flustrella) hispidum in the same time that it yet 



more closely connects that genus with Membranipora. 

 :i ) Krit. Fört., Öfvers. Vet.-Akad. Förh., 1867, p. 302 etc. 



