XX 



• Conrad (Am. Joum. Conch., vol. ri, p. 196,) places Pachydon, for which ho would rather substitute the name AnuoUiyrit, among the COSBULINX, but I do not think that iu 

 identity with Qootlallm cin he questioned. 



t SlicII ovatfly t'lnii^rateil, mm-li compressed, inequilateral, anteriorly much shorter; coucentrically striated; umboues very small, curved in; lunule small, deep; hinfrc with a 

 siniile, lurce, clonpalcii. caniin;il tooth iu cich valve ; type, E. Arconatii, Issel, from the red sea, (Ak.iha-bav). The characters of the species, as gi\n\ \n- Issel, .ire not sufficient to 

 determine tlie dassilication of Iho kcuus. In Kciioral form it is cvideutly dose to Ooodallia, but it also exliibits considerable relation to some of the elongated' forms of Lorivet. (Issel, 

 Malaeolopia del Mar rosso. 18(;9, p. M.',. pi. i, titr. In), 



I ( ? Sub-senera, Hrjuimi, Uluua. Thmilin apod II. and A. Ad.-inis, Oen. II, p. 489). 



I The type species is said to dilTer from Mar:i,irihi)ia by having the gills in their enlirc length united to the mantle, a small cardinal tubercle in each valve, (Verhandlg. lud 

 Mittheilg. dcs Sicbenbiirg. Ver. f. Xaturw., vol. ivii, Isuti, p. 184). 



