442 . NAIADITES FROM NOVA SCOTIA. [Aug. 1894, 



Fig. 11. Slab with (a) Anthracomya elongata. 



(b) Anthracomya, sp. ? 



(c) Naiadites carbonarius. 



(Collection of the Geol. Survey of Cariada.) 



12. Anthracomya lesvis (Dawson). 



13. Anthracomya cvalis (Dawson). Horizon of the Millstone Grit. 



' , f Carbonicola (M'Coy) 1 , , ,-p. .. 



14 \ a \li ■ ITT- \ f anqulata (Dawson.). 



\ Anthracosia (lung) ) y ' 



[Note. — Specimens 1, 4, 5 belong to Sir J. W. Dawson's collection in the 

 McGrill College, Montreal; specimens 11 & 13 to the Geological Survey of 

 Canada. The remainder ha\e been presented to me by Sir J. W. Dawson. — 

 W. H.] 



Discussion. 



Prof. J. P. Blake observed that the name Naiadites had been 

 used by Bnckman for a Liassic plant in 1845, and therefore was 

 not available for a Carboniferous shell in 1862. As to the name 

 Anthracomya, there is no more objection to it on the score of the 

 shell not belonging to the Myacidse than to the name Goniomya 

 for shells belonging to the Anatinidse. 



Dr. W. T. Blanford said that one important point had appa- 

 rently escaped Dr. Hind's notice. Mr. Salter, in the Society's 

 Journal for 1863, retained the name Anthracomya in preference to 

 Naiadites, because the latter genus had never been described. 

 Barnes published without a description have, of course, no claim to 

 recognition. 



Dr. J. W. Gregory pointed out that the use of a generic name in 

 botany does not bar its subsequent use in zoology ; as the botanists 

 insist on using names previously used for animals, zoologists have 

 no option but to do the same. 



The President, Prof. T. M c Kenny Hughes, and Mr. Marr also 

 spoke. * 



