1 70 Rev. T. Hiiicks's Contributions towards a 



The synonymy of Micropora impressa contained in Miss 

 Jelly's invaluable ' Catalogue' mcXxxd^es, Memhranipora Ande- 

 govensis, of ]?usk, 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 Andeqavensis of Busk as a synonym 

 of Sieganojwrella {Thalamoporella) Smittii (B. M. P. 178)." 

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

 vol. i. pp. ]78, 179). Through AJr. Busk's kindness I had 

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

 hranipora Andeg<ivensis of the ' 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 

 St( ganoporella Smittii, which I was about to describe, and 

 asked Mr. Busk 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 tjpe-specimen I found such a general agi'cement between 

 it and the recent species as to leave no doubt res])ecting the 

 identity of the two forms. The shape and stiucture 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 

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

 shows that he was mistaken. ]\licheliu's species, there can 

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

 pora Andegavensis of Busk must theiefore be removed from 

 the synonymy of the latter. 



Manzoni identifies Memhranipora calpensis, Busk (which is 

 no doubt Eschara impressa ot ^loll), with Miehelin's E. Ande- 

 gavensis, but follows Busk in referiing the Crag species to 

 the latter. Probably he merely copied Busk without careful 

 examination of his figure. 



Ibid. (p. 30 Sep.). 

 Micropoj-eUa JissOf sp. n. 



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

 violacui, Johnston (sp.). The })oints of ditierence are the 

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

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



