56 Prof. W, King on the Fossil gentis Anthracosia. 



Jukesii by EorbeSj and occurring in the Knocktopher plant-beds, 

 is calculated to settle this point ; for should it possess the scars 

 in question, the conclusion must arise that normal species of the 

 family existed in the Devonian epoch, — also contemporaneously 

 with Anthi'acosia. 



Supplementary Note. 



Not being able to identify the type of Anthracosia with any 

 published species, I am under the necessity of publishing it as 

 new, naming it after my friend Mr. Bean. 



Anthracosia Beaniana, King. 



Diagnosis. — Oval: very inequilateral. Umhones s,m2iW. Valves 

 thin, rather tumid, and marked with nearly obsolete wrinkles. 



This species has some resemblance to Brown's Pachyodon 

 bipennis ; but it differs from the latter notably in the anterior 

 end being much shorter. The valves throughout their length 

 are evenly rounded, giving no marked prominence to the um- 

 bones. It does not appear to have much exceeded an inch or so 

 in length. 



It occurred to me in the coal-measures near Newcastle-on- 

 Tyne*. 



Belmont, near Galwa}', 

 December 12, 1855. 



EXPLANATION OF PLATE IV. 



Fig. 1. Anthracosia Beaniana, King, a. Left valve (which is restored 

 behind the black line) ; b, Right valve. 



Fig. 2. Dental system of the same species; enlarged, a + , posterior slope, 

 b-\- , anterior ridge of cardinal tooth of left valve, a; a, posterior 

 ridge (fitting on posterior slope (ff-f-) of tooth of opposite valve), 

 b, anterior excavation (receiving anterior ridge (64-) of tooth of 

 opposite valve) of right valve, b ; o, o, ligamental fulcra on hinge- 

 plate. 



Fig. 3. Diagram exhibiting vertical section of cardinal teeth of the same 



* A few days ago (Dec. 22) I received from Professor Sedgwick for the 

 Library of Qneen's College, Galway, the Third Fasciculus of his " Synopsis 

 of the Classification of the British Palieozoic Rocks," in which I perceive 

 that Professor M'Coy has published a genus under the name Carbonicola. 

 My friend evidently thinks it synonymous with Anthracosia, which he ad- 

 mits being aware that I intended describing ! However, if the genus Car- 

 bonicola possess the characters diagnosed by Professor M'Coy, it is clearly 

 not the same as my Anthracosia, which does not possess any lateral teeth. 

 There are certain errors in the remarks under the genus Carbonicola which 

 it must be obvious to any one that I am not called on to correct ; but it is 

 otherwise with several interspersed throughout the work. Some of those now 

 alluded to, I purpose correcting in future Numbers of the ' Annals,' and 

 the remainder I hope to put right, should I have an opportunity of bring- 

 ing out a new edition of my Monograph. ^ — Dec. 27, 1855. 



