480 CRETACEOrS PELECTPODA 



ADDITIONS AND COREECTIONS. 



Family^ — Tkoladidm, Suh-family, — teeudinjE, 



On page 14, after No. 8, add — 



9. Lyrodus, Gould, 1870, (Invert, of Massach., 2n(i edition, p. 34). This 

 name has been suggested for a small species, Teredo cUorotica, the palettes of 

 which are elongated, with the basal portion thin, flexuous, the upper ''lyre-shaped," 

 the extreme two-thirds of their length being " covered with a dark crust which 

 has a projecting horn at each angle." The form of these palettes very closely 

 resembles that of Nausitoria, when the tip is broken away. It is not improbable 

 that both belong to one and the same genus. 



On page 31, line 9 from top, for "Pig. 12," read Pig. 11, 



Family, — Myid^, Sub-family, — corb xjlinm. 



On page 35, hefore "4. Hucharis, Recluz," &c., add— 



Za. TcEniodon, Dunker, 1851, (Palseontographica, by Dunker and H. von 

 Meyer). Shell ovately elongated, sub-equilateral, smooth, equivalve, and ai)pa- 

 rently closed, right valve with a cardinal tooth under the umbo extending forwards, 

 left valve with a distinct marginal cartilage pit behind the beak ; type, T, ellipticus, 

 from liassic beds near Halberstadt (Germany). Dunker says, that the ligament 

 was partially external, partially internal, and that the valves are not gaping. So 

 far, this character would agree with Eucharis, but the hinge appears to be different ; 

 muscular and pallial impressions have not been observed. The genus is evidently 

 closely allied to Corhula, and still more so to Quenstedtia, but unless the last named 

 genus and JEucharis be better characterized, it will pot be possible to form a correct 

 idea q^ their affinities to Tceniodon. 



Qnpage 39, hefore '^Sub-family, — myinm,'' add— 



14, J)orsomya dorsata is figured by Ryckholt as an apparently new genus 

 from the carboniferous beds of Belgium. The figure represents a cast of an elon- 

 gately ovate shell, with a convex dorsal and slightly flexuous ventral margin, very 

 inequilateral, the small beaks being almost anterior, two small ovoid muscular scars, 

 one placed quite at the anterior end, the other near the posterior dorsal margin; 

 pallial line in the upper posterior part with an almost horizontal, deep, narrow 

 sinus. The shell resembles Corbulomya in shape, but the knowledge of the hinge 

 is essential for its correct generic determination, fvide Eyckholt, Melanges 

 Pal^ont., 1852, p. 17, pi. x, fig. 20, in M6m., Cour. Acad. Belgique, vol. xxiv). 



