EXPEDITION ANTARCTIQUE EELGE 



Species of spécial interest 



The Antarctic species of spécial interest may be said to be the following : Catcnicella 

 frigida nov., as occurring so far south ; F lustra flagellata nov. as having vibracula instead 

 of avicularia; Microporella trinervis nov. having within the front wall a diverging tube leading 

 to a round opening on each side of the zoœcium, and it is to be hoped that some of the 

 Expéditions will bring back better spécimens, so that the structure can be understood ; 

 Systenopora contracta nov. has a narrow slit-like peristomial aperture (unlike that of other 

 Cheilostomata), and has an avicularium within the aperture. A Cretaceous fossil appears to 

 belong to the same genus. Cellepora horneroides nov. with the zoœcia only on one side, 

 and with the surface so much reminding us of the Cyclostomata is interesting. In the 

 Retcporœ several species hâve a lepralioid aperture, and this group of Retcpora only known 

 previously in two species is Avell represented. Beania erccta nov. has avicularia the same 

 shape as the appendages of B. crotali Busk, and this seems to indicate that B. crotali is 

 degenerata B. erccta. Thick sections of Retcpora hippocrepis nov. reveal two short tubes arising 

 from the flesby mass to which the oral glands are attached and this no doubt is an important 

 structure requiring further studv. Hcteropora claviformis nov. occurs, but in an unsatisfactory 

 condition for studv, thougb anv possibilité of doubt as to its being Bryozoa is removed. 



Alcyonidium is found, and as it has onlv been recorded from the southern hémisphère 

 in a few cases, there are grounds for believing, that it may hâve been overlooked. 



As to which species are common we hâve sometimes to judge not by the large quanti- 

 fies, but by finding spécimens occurring from various dredgings ; and from the quantities or 

 the frequency we mav say that common species are Membranipora uniserialis nov., Cellaria 

 Dennanti MacG.; Micropora brevissima nov.; Crïbrilina projecta nov.; Schizoporella frigida nov.; 

 Hippothoa divaricata Lamx. ; H . distans MacG. ; Systenopora contracta nov. ; Cellarinella foveolata 

 nov. ; Snuttia reptans nov. ; S. inclusa nov. ; S. antarctica nov. ; Cellepora horneroides nov. ; 

 TuiTitigcra stellata Busk ; Retcpora antarctica nov. ; R. hippocrepis nov. ; Hornera antarctica nov. ; 

 Stomatopora antarctica nov. 



Number of Species 



In the material submitted to me there were 97 species of Bryozoa, but 11 ot thèse 

 were collected before the Expédition reached the Antarctic, while 2 occur both from the 

 Antarctic and Subantarctic material. Of thèse 11 species ail had been previously described, 

 and do not require further discussion. The remaining 86 species and varieties, collected 

 within the Antarctic area furnished 29 described and 5j new. As however there is so much 

 more uncertainty as to the détermination and position of the Cyclostomata, it is better to 

 consider the Cheilostomata hrst, however mentioning that there is one new Ctenostome. In 

 the suborder Cheilostomata there are 22 previously described species, and 5o considered to 

 be new, but figures do not fully express the state of the case, as many are very closely 

 related to known species, however, even taking this into considération, the number of new 

 forms is remarkably large. 



Of the Cheilostomata 9 are considered to be Australian and Xew Zealand species, 

 16 South American, 4 Argentine and Chili, 3 South African, 9 already known from the 



