232 MR. P. S. ABRAHAM ON THE [ Mar. 6, 
Gen. PLocamoruorvts, Riippell & Leuckart, 1828. 
Plocamoceros, Cuvier, 1830. Plocamophorus, Gray, 1842. Peplidia, 
Lowe, 1842. Histiophorus, Pease, 1860. 
Body limaciform. Mantle represented by a supracapital veil 
bearing tuberculate or branched appendages on the margin, and by two 
or three tubercular processes upon each side of the back. Rhino- 
phores laminate. Oral tentacles flat. Branchize few, non-retractile. 
Tail dorsally carinated. Odontophore with the spines near the middle 
bicuspid, none median in position. An incomplete buccal collar. 
1. P. oceLuatus, Riipp. & Leuck. Atl. zu der Reise nord. Afrik., 
*‘Neue Wirb. Th. des roth. Meers,” p. 17, T. 5. f. 3. 
HTab. Red Sea. 
2. P. crytonicus, Ald. & Hane. 
Polycera? ceylonica, Kelaart, Ann. & Mag. Nat. Hist. 3rd ser. iii. 
p- 489 (1859); figured by Ald. & Hane. T. Z.S. vol. v. pl. 32. f. 4-6. 
Hab. Coromandel and Ceylon coasts. 
3. P. rmpeRtALis, Angas, Journ. de Conch. xii. p. 52, pl. 5. f. 7 
(1864). 
Hab. New South Wales. 
4. P. MACULATUS. 
Histiophorus maculatus, Pease, P. Z. 8. 1861, p. 36. 
Hab. Sandwich Islands. 
5. P. MADER. 
Peplidia madere, Lowe, P. Z. 8. 1842, p. 51. 
Hab. Madeira. 
6. P. nawvarus, Abraham, Ann. & Mag. Nat. Hist. 4th ser. xviii. 
p- 139, pl. 6. f. 4, 4a. 
Hab. New South Wales. 
7. P. uevrvarius, Abraham, Bull. de la Soc. Zool. de France, 
1876, p. 287, f. 1-4. 
EA 
8. P. ? sp.’, figured in Krusenstern’s ‘ Atlas,’ T. 88. f. (1813). 
Hab. ——? 
9. P. r1LEes11, Bergh ; figured partially in Semper’s ‘ Reise,’ T. 51. 
f. 17-27, & T. 53. f. 1-4 (1876). 
Hab. 2 

10. P. RAMULOSUS. 
Polycera? ramulosa, Stimpson, Proce. Ac. Nat. Sci. Phil. vii. p. 379 
(1855). 
Hab. China. 
' T have been unable to see the text of Krusenstern. In case the animal 
has not been named by Tilesius, I have elsewhere proposed flagellatus for its 
specific name, on account of the flagellate lateral prolongations of the supra- 
capital yeil. 
