Geiierul History of the Marine Polyzoa. 33^ 



sfoniatous genera by its ooecial characters. Its ovlcelli^erous 

 cell differs essentially from the (fon<eciuin or sexual cell which 

 occurs atnongst the Adeonea'. The latter is an enlarged and 

 otherwise modified zooecium set apart for reproductive func- 

 tions. In the present genus there is a true external ooecium 

 or special chamber for the reception of the embryo, but instead 

 of being an appendage of the zooecium, as is usual, it is an 

 integral |)art of it, occupying the whole of the u])per (or ante- 

 rior) jjortion of the cell which is inclosed by a ribbed roofing. 

 This bears a close resemblance in structure to the front wall 

 of the Cribrilinc zooecium, and like it has originated in a 

 modification and adaptation of the marginal spines. 



The morphological history, then, of the ooBcium in this 

 form is unique and its structural elements differ altogether 

 from those which are met with in ordinary species. There is 

 certainly a valid claim to generic rank. 



In the absence of living specimens and of specimens 

 preserved in spirit it is hardly possible to interpret the struc- 

 ture and its functions fully ; but we may hope that the 

 observations of the Australian naturalists will soon enable us 

 to complete the history. 



Ibid. (p. 72 sep.) *. 

 Meinhranipora variegata, sp. n. 



This species appears to be identical with M. ecliinata^ 

 d'Orb. (Voy. Araer. merid. pt. 4, p. 16). D'Orbigny does 

 not mention the pedicellate avicularia, and his diagnosis is 

 wanting in fulness ; but there can be no doubt that he had 

 the present species in view. It will rank as M. echinata, 

 d'Orbigny. 



Additional Loc. Chili and Peru {d^Orb.) ; Queen Charlotte 

 Islands [Dr. Dawson). 



Ibid. (p. 73 Sep.). 

 Diuchoris {Beania) distans^ sp. n. 



Waters (" Australian Bryozoa," ' Annals ' for August 

 1887, p. 94) identifies this species with Diachoris spinigera^ 

 MacG. He says, " There is considerable irregularity in the 

 number of spines, and from this specimen I consider that D. 

 distans, Hincks, is too closely allied to be separated as a 

 species." 



* See nlso ' Annals ' for February 1882, ser. -5. vol, ix, p. 81 (sep.). 



