OP SOUTHERN INDIA. 483 



Page 124, 5th line, from bottom, for T. fFer.J primula, read T. [TeUinides] 

 primula ; for further reference see p. 126. 



At the end of page 145 add — 



6. Liocyma, Dall, 1870, (Proc. Post. Soe. Nat. Hist., xiii, p. 252,) has been 

 proposed for Tapes fluctnosa, Gould, (Moll. Massach., 2nd edit., p. 136). It is a 

 small, ovate, concentrically striated, compressed, nearly equivalve and rather thin 

 shell ; there are in each valve three cardinal teeth, the middle one cleft ; pallial 

 sinus small. I doubt that sufficient reason exists for separating generically the 

 shell from Pidlastra, as restricted ; it does not appear to differ from small, or young, 

 forms of this genus. 



Fage 147, Qa. Mercenaria — 



Perkins, in a paper on the Molluscan fauna of New Haven, Part II, &c., 

 (Proc. Post. Soc. Nat. Hist., Nov. 1869, p. 147,) proposes to substitute for Merce- 

 naria a new generic name, Crassivenus. I need not repeat what I have already 

 noticed in my introduction, that the recently proposed so-called "rule" of the 

 Pritish Association, rejecting all generic names which have been taken from specific 

 designations, is in its application impracticable, and has no chance of being adopted 

 by naturalists. It must not take retrospective effect. 



On page 152 add — 



8?. Artena, Conrad, 1870, (Am. Journ. Conch., VI, p. 76). Shell "triangu- 

 lar, thick ; surface with acute, concentric, prominent ribs ; hinge with three cardi- 

 nal teeth in the right valve, two of them diverging, distant, the anterior one under 

 the apex robust, direct, curved ; left valve with three diverging distant teeth ; lateral 

 tooth very small, pyramidal ; pallial siuus very small and angular." Type, Cythe- 

 rea staminea, Conrad, (Foss. tert. form., U. S., pi. 21, fig. 1). This appears to be 

 very close to some species of Dione and barely different from that sub-genus. 

 Conrad states that it differs from Cytherea, (= Meretrix), Caryatis, and others by 

 the one thick anterior cardinal tooth of the right valve instead of two approximate 

 teeth, 'and by the two distant thick, nearly equal teeth of the opposite valve,' &c., 

 but in the above characteristic there are said to be ' three distant teeth.' 

 On page 156 iwte under — 



13. Eripthyla, Gabb. I quoted as one of the best known species of this 

 genus Luciiia lenticidaris, Goldf. This species is noticed by Posquet in his Liste 

 des foss. de mass. cr^t. du Limbourg, p. 16, (Extr. du Prod, d'une desc. geol. de la 

 Pelgique, par G. Dewalque, 1868,) as Dozyia lenticidaris, Posq., evidently with 

 the object of suggesting it as the type of a new genus. 



14. Gemma, Desh. Stimpson had abeady called Venus Gemma, Totten, 

 which is the type species of the genus. Gemma Totteni, a name which I had 

 previously overlooked. Perkins (Proc. Poston Nat. Hist. Soc, November 1869, 

 p. 148,) suggests the new generic name Totteniana* "according to the Pritish 



* The author might at least have so far conformed to the ohvions rule of using the name ToUenia, unless he 

 has discovered that Mr. Totten was wrong in originally spelling his own name (see Tryon in Am. Journ. Conch., VI, 

 p. 177). 



