1 70 Kev. T. Hincks's Contributions towards a 



The synonymy of Micropora impressa contained in Miss 

 Jelly's invaluable ' Catalogue ' includes Memhranipora Ande- 

 gavensis, of Busk, and in a note at the close of it the author 

 adds the following : — " Regarding the synonymy of this 

 species it must be remarked that opinions differ. Hincks 

 places the Memhranipora Andegavensis of Busk as a synonym 

 of Steganoimrella [Thalamoporella) Smittii (B. M. P. 178)." 

 My reason for doing so I have already explained (B. M. P. 

 vol. i. pp. 178, 179). Through Mr. Busk's kindness I had 

 the opportunity of examining the type-specimen of tiie Mem- 

 hrani^^ora Andegavensis of tiie ' Crag Polyzoa.' So far as 

 my recollection goes, I had been struck by the close resem- 

 blance between the avicularia of the latter and those of 

 Steganoporella Smittii, which I was about to describe, and 

 asked Mr. Bnsk to allow me to see his specimen. And, in 

 passing, I may remark that the presence of the large and 

 remarkable avicularia, which are clearly shown in Busk's 

 figure of M. Andegavensis^ is in itself conclusive as to the 

 synonymic question. Micropora impressa^ so far as I know, 

 is altogether destitute of these appendages. On examining 

 the type-specimen I found such a general agreement between 

 it and the recent species as to leave no doubt respecting the 

 identity of the two forms. The shape and structure of the 

 avicularium are the same in both ; this I was able to deter- 

 mine even with respect to the minute details, as in one or two 

 cases the mandible of the avicularium had been preserved in 

 the fossil specimen. What Mr. Busk's reasons might be for 

 identifying his species with the Eschara Andegavensis of 

 Michehn 1 have no means of knowing ; but his own figure 

 shows that lie was mistaken. Michelin's species, tliere can 

 be little doubt, is the Eschara impressa of Moll. Memhrani- 

 pora Andegavensis of Busk must therefore be removed from 

 the synonymy of the latter. 



Manzoni identifies Memhranipora calpensis, Busk (which is 

 no doubt Eschara impressa of Moll), with Michelin's E. Ande- 

 gavensis, but follows Busk in referring the Crag species to 

 the latter. Probably he merely copied Busk without careful 

 examination of his figure. 



Ibid. (p. 30 Sep.). 

 Microporella Jissa, sp. n. 



On the whole I am inclined to refer this form to Adeona 

 violacea, Johnston (sp.). The points of ditference are the 

 shape of the pore, the oblique direction of the suboral avicu- 

 larium, the presence of zooecia bearing a large lateral avicu- 



