330 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57, 



Cat. No. 



82923 

 110962 



64231 

 314876 

 314877 

 314864 

 314865 

 314866 

 314868 

 314869 

 314890 

 314875 

 314872 

 314873 

 314871 

 314874 

 314867 



64230 



Locality. 



Florida Keys 



Tortugas, 43 fathoms 



Barbados, 100 fathoms . . 

 Barbados, 50-60 fathoms 

 Barbados, 33 fathoms... 

 Barbados, 100 fathoms.. 

 Barbados, 75-80 fathoms 

 Barbados, 30-70 fathoms 

 Barbados, 80 fathoms... 

 Barbados, 75 fathoms... 

 Barbados, 75-80 fathoms 

 Barbados, 80 fathoms... 

 Barbados, 40-75 fathoms 

 Barbados, 35-75 fathoms 



Barbados, 35 



Barbados, 25-72 fathoms 



Antigua, 120 fathoms 



Grenada, 170 



Collector. 



Pourtales.. 

 Pourtales.. 



Blahe 



Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson. 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Henderson . 

 Blake 



Number 

 of speci- 

 mens. 



2 



5 



6 



Many. 



Many. 



1 



18 



Many. 



i2 



27 



4 



38 



24 



26 



1 



18 



4 



1 



Some confusion was caused by the fact that the coloration of 

 Davidson's A. harrettiana and of this species is similar, while Crosse 

 and Fischer figured one of the rare unicolorate specimens to illus- 

 trate their A. schrammi. But the reception of many specimens has 

 enabled me to clear this up, the former species being many times 

 larger than the latter which is extremely uniform. If the difference 

 in color be regarded as of varietal rank, the name ruhrotinda would 

 apply to the specimens with' scarlet radial lines. 



Genus MEGATHYRIS Orbigny. 



Megathiris Orbigny, Comptes Rendus, vol. 25, pp. 192, 269, 1847; Ann. Sci. Nat., 



Zool., ser. 3, vol. 8, p. 341, 1847. 

 Megathyris Bronn, Jahrbuch fiir Mineral., p. 244, 1848. 

 Argiope Deslongchamps, Mem. Soc. Lin. de Normandie, vol. 7, p. 9, 1842; not 



Argiope Savigny, 1827. 



MEGATHVRIS DETRUNCATA Gmelln. 



Anomia decollata Chemnitz, Conch. Cab., vol. 8, p. 96, pi. 98, fig. 705 a-d., 1785 



(not binomial). 

 Anomia detruncata Gmelin, Syst. Nat., p. 3347, 1791. 

 Anomia decollata Dillwyn, Descr. Cat, Rec. Sh., vol. 1, p. 292, 1817. 

 Terebratula detruncata Blainville, Diet. Sci. Nat., vol. 53, p. 141, 1828. — Phil- 



ippi. En. Moll. Sicil., vol. 1, p. 96, pi. 6, fig. 14, 1836.— Forbes, Aegean Sea, 



p. 141, 1844. 

 Terebratula aperta Blainville, Diet. Sci. Nat., vol. 53, p. 144, 1828. 

 Terebratula uma-antiqua Risso, Hist. Nat. Eiir. M^r,, vol. 4, p. 388, pi. 12, fig. 



177, 1826. 

 Terebratula cardita Risso, Hist. Nat. Eur. Mer., vol. 4, p. 389, pi. 12, fig. 180, 1826. 

 Terebratula decollata Desha yes in Lamarck, Anim. s. Vert., ed. 2, vol. 7, p. 350, 



1836. 

 Terebratula dimidiata Scacchi, Osserv. Zool., p. 17, 1833. 



