304 H. W. Burrows — A Bryozoan from Mekran Coast. 



The colony under description is attached to the apical whorls of 

 a Neptimea, closely allied to the Crag N. jugosa (S. V. Wood), and 

 which was found enclosed in one of the Mekran nodules. 



The zooecia are rather distorted and crowded together as they 

 accommodate themselves to the sutures and ridges of the mollusc 

 on which they have grown. The mature zooecia measure about 

 0*20 by 0"33 mm., and are almost quadrangular, with slightly 

 rounded angles. 



This species appears to be referable to M. Lacroixti, as figured 

 by Busk in the British Museum Catalogue, the most apparent 

 difference being that the cell-walls are relatively thicker ; this, 

 however, is more noticeable in the earlier zooecia — the later formed 

 and typical cells have thinner walls. 



The synonymy of this species is rather involved, but reference 

 need only here be made to the most important. 



Memhranipora Lacroixi (V. Audouin). Enlarged 45 times. 



Attached to apical whorls of Ncptunea Jugosa, found enclosed in nodule from 



Meki'au Coast. 



Busk,' in the "Crag Polyzoa" (p. 31), refers Lacroixii (in part) 

 to Savartii, Audouin. 



Pergens- regards M. reticulum, ill. Lacroixii, and M. Savartii as 

 synonymous. 



Later writers have considered M. Savartii to be a distinct species, 

 and have included in its synonymy Biflustra delicatida of the Crag. 



Waters,'-* in his memoir on the Membraniporid?e, points out that 

 the ' rosette- plates ' of ill. Lacroixii and ilf. Savartii are quite 

 different. 



1 G. Busk, A Monograph of the Fossil Polyzoa of the Crag : Palseontographical 

 Society, 1859. ^^ ■ 



- Ed. Pergens, "Pliocane Bryozoen von Rhodos" : Ann. k.k. nat. Hofmuseums 

 (Wien), 1887, vol. ii, p. 14. ,-.' c, rr ^ 



3 X. W. Waters, " Observations on Membrauiporidaj " : Jouru. Linn, boc, Zool., 

 1898, vol. xxvi, p. 679. 



