250 REPORT— 1882. 



possible to arrange the species stratagraphically, as many, having the 

 same type of cell, range from the Lias upwards. As far as I am able to 

 do so I shall give the range of the species, beginning, of course, with the 

 lowest strata. 



Class POLTZOA. 



Sub-order Ctclostomata, Busk. 



Fam. I. CkisiiDvE, Busk. 



No fossils belonging to this family are at present known to have existed 

 in the Jurassic epoch. 



Fam. II. 1880. TuBULiPORiDif;,' Hincks. 



' Zoarium entirely adherent, or more or less free and erect, multiform, 

 often linear, or flabellate, or lobate, sometimes cylindrical. Zocecia 

 tubular, disposed in contiguous series or in single lines. Omcium, an 

 inflation of the surface of the zoarium at certain points, or a modified 

 cell.' (Vol. i. p. 424.) 



1. Stomatopora, Bronn. 4. Entalophora, Lamx. 



2. TuBULiPORA, Lamarck. 5. Diastopora, „ (pars). 



3. Idmonea, Lamouronx, 



1825. Stomatopora, Bronn. 

 1821. Alecto, Lamx.; 1826, Aulopora (pars), Goldf. 



1 have already done partial justice to the uniserial Stomatopora, found 

 in the Palaeozoic rocks ^ of this and other countries. I have again 

 studied the species described by James Hall, Professor Nicholson, and 

 myself, and I cannot, at present, detect any generic character in the 

 species that may be used by the systematic paleontologist to separate 

 the PalfBozoic from the Massozoic types. I must, therefore, regard the 

 Btomatoporoi of the two epochs as one, though the sequence is broken in 

 the Palgeozoic — no species having as yet, I believe, been recorded from 

 the Carboniferous series of this or any other country. 



Jules Haime has already pointed out the striking differences between 

 the Alecto of Lamx. founded upon A. dicJwtoma and the Devonian 

 Aulopora ; but I have not been able to verify his strictures regarding 

 the exclusion of the latter from this group. It may be possible, however, 

 to find that corals and polyzoa have been unwittingly united in some of 

 our identifications. Haime gives seven different Jurassic species as 

 found in the Lias and Oolite of this and other countries. As far as my 

 material will justify the assumption, I claim for our British area the 

 following charactei'istic types. As they are somewhat different I give the 

 characters of our own species and varieties. 



I. Stomatopora antiqua, Haime. 

 (pi. vi. fig. 7,^ Jurassic Bryozoa). 



Zoariuvi branching dichotomously, branches contorted, very rarely 

 anastomosing. Zocecia uniserial ; lateral zoo3cia given off from either 



' For SjTionyms see British Marine Polyzoa. 



2 Brit. Assoc. Report, 1881. Silurian Uniserial, Stomatopora and Ascodictya. 

 ' Notes on the Wenlock Polyzoa,' QuaH. Journ. Geol. Soc. Nov. 1881, Feb. 1882. 



^ The references to Haime's work, Bryor,narcs Fossilcst de la, Formation jurasse. 



