REPOET OR T THE HETEROPODA. 
17 
Pterotrachea keraudrenii (Eydoux and Souleyet). 
1841. Firole de keraudren, Eydoux and Souleyet, Yoy. “ Bonite,” Atlas, pi. xvi. figs. 8-10. 
1847. Firola keraudrenii, Chenu, Lecons elem. Hist, nat., p. 130, fig. 417 (reduced copy of 
Eydoux and Souleyet). 
1 850 1 ., „ Desliayes, Traite Conch., pi. cii. fig. 6 (copy of Eydoux and Souleyet). 
1850. Pterotrachea keraudrenii, Gray, Fig. Moll. Aniru., pi. ccxxxviii. fig. 3 (copy of Eydoux 
and Sordeyet). 
1852. Firola keraudrenii, Souleyet, Yoy. “Bonite,” Zool., vol. ii. p. 349. 
1855. Pterotrachea keraudrenii, H. and A. Adams, Gen. Moll., vol. ii. p. 94. 
Habitat. — Mid Atlantic (Eydoux and Souleyet). 
Pterotrachea scutata, Gegenbaur. 
1855. Pterotrachea scidata, Gegenbaur, Untersuch. Pterop. und Heterop., pp. 185, 215, pi. viii. 
figs. 19, 20. 
Habitat. — Messina (Gegenbaur). 
Species beyond Recognition. 
Pterotrachea liyalina, Forskal. 
1775. 
1776. 
1789. 
1791. 
1805. 
1817. 
1822. 
1825. 
1830. 
1830. 
1841. 
1843. 
1843. 
Pterotrachea liyalina, Forskal, Descrip. Anim., p. 118. 
„ „ id., leones, p. 10, pi. xxxiv. fig. B. 
,, ,, Gmelin, Syst. Rat., vol. vi. p. 3137. 
,, ,. Bruguiere, Ency. Metb., pi. Ixxxviii. fig. 2 (copy of Forsk&l). 
,, „ Roissy, Hist. Rat. (Suite a Buffon), vol. v. p. 79. 
Firole transparente, Bose, Nouv. Diet. Hist. Rat., vol. xi. pi. D.xx. fig. 11 (reversed copy 
of Forskal). 
Pterotrachea liyalina, Lamarck, Anim. sans Vert., vol. vii. p. 676; ed. 2, vol. xi. p. 384. 
„ „ Eschscholtz, Isis von Oken, p. 736. 
,, „ Deshayes, Ency. M6th., vol. ii. p. 130. 
,, ,, Bose, Hist, nat., vers, ed. 2, vol. i. p. 64, pi. ii. fig. 1 (reversed copy 
of Forskal). 
„ ,, Chiaje, Descriz. e Rotom. Anim. Invert. Sicil., vol. ii. p. 93. 
„ „ id., Rendicont. Accad. Sci. Soc. Borbon. Rapoli, vol. ii. p. 106. 
Firola hyalina, Forbes, Report Brit. Assoc., p. 132. 
Habitat. — Not stated by Forskal. Probably Mediterranean. 
This species I am inclined to think must be a small Firoloida. 
(ZOOL. C3ALL. EXP. PAET LXXII. — 1888.) 
Cccc 3 
