48 
THE VOYAGE OF H.M.S. CHALLENGER. 
II. Marionia, Vayssiere. 
Marionia, A. Vayssiere, Sur un nouveau genre de la famille des Tritioniad4s, Comptes rendus, 
t. lxxv., 1877, pp. 299-301. 
„ A. Vayssiere, Description dela Marionia Bergliii, Journ. de Conchyl., ser. 3, t. xix., 1879, 
pp. 106-118, pi. vii. 
„ R. Bergh, Beitr. zu einer Monogr. d. Gatt. Marionia, Vayss., Mittheil. d. zool. Stat. zu 
Neapel, Bd. iv., 1883, pp. 297-320, Taf. xxi. 
Forma corporis ut in Tritoniis propriis ; limbus frontalis digitatus, digitis compositis 
numerosis. 
Ventriculus lamellis solidis armatns. 
The genus Marionia is readily distinguished from Tritonia by the form of the pro- 
cesses of the frontal veil, and by the armed condition of the stomach. 
A number of species have been referred to this genus, many of which may possibly 
prove to be identical ; they are as follows : — 
1. Marionia blainvillea (Risso). 
Marionia bergliii, Vayss. 
Mediterranean. 
' 2. Marionia decaphylla (Cantraine). 
Mediterranean. 
3. Marionia quadrilatera (Schultz). 
Mediterranean. 
4. Marionia affinis, Bergh. 
Mediterranean. 
5. Marionia tethydea (delle Chiaje). 
' Mediterranean. 
6. Marionia costa (Verany). 
I Mediterranean. 
7 . Marionia meyeri (Verany). 
Mediterranean. 
8. Marionia acuminata ( 0 . G. Costa). 
Mediterranean. 
