298 Bulletin Vanderbilt Marine Museum, Vol. VII 



Long diameter, 21.5 millimeters; short diameter, 14 milli- 

 meters ; altitude, 7 millimeters. 



This species attains a much greater size than the present speci- 

 men and is one of the most strikingly coloured members of the 

 genus found in the Indo-Pacific. Yet in its home in the tidal zone 

 of the beauteous coral reefs this striking colour pattern of the 

 snail merges almost invisibly with its environment. 



References : Haliotis naevosa, Martyn, Thomas, Univ. Conch., 

 London, 1785, vol. II, fig. 63. — Reeve, L., Conch. Icon., 1856, 

 vol. II, pi. 8, fig. 27, pi. 9, figs.27-a-c.— SowERBY, G. B., Thes. 

 Conch., 1882, vol. V, 3, Haliotis, p. 31, fig. 39.— Wienkauff, 

 in Martini, F. H. W., und Chemnitz, J. H., Syst. Conch. 

 Cab., 1883, Bd. VI, Haliotis, p. 34, taf. 14, figs. 1-3.— Dall, 

 W. H., Proc. U. S. Nat. Mus., 1906, vol. XXIX, p. 431. 



Haliotis clathrata, Reeve, Lovell, op. cit., pi. 17, fig. 72. — 

 SowERBY, G. B., op. cit., pi. 6, fig. 39 (young) . 



Order: NUDIBRANCHIATA 

 Suborder: Nudibranchiata Holohepatica 

 Family: PLATYDORIDIDAE Bergh 



Genus: PLATYDORIS Bergh 



Platydoris cruenta (Quoy and Gaimard) 



f 



Plate 114 



Type : M. Quoy and Gaimard's type was secured by the "As- 

 trolabe" in New Guinea waters and deposited in the Paris 

 Museum. 



Distribution: Indo-Pacific, New Guinea (Quoy and Gaim- 

 ard) ; Amboina Bay ; Siboga Stations : No. 78, reef, Lum-lumu 

 Shoal, Borneo Bank ; reef. No. 279, Ruma-Kuda Bay, Roma Island ; 

 No. 193, reef, Sanana Bay, east coast, Suli Besi; No. 213, reef, 

 Pulu-Pasi-Tanette ; No. 209, south spit, Kabaena Island, and 

 No. 131, reef, Beo Bay, Karakelang Islands; all in the Dutch East 

 Indies (Bergh) ; Samoa (Boone). 



Material examined : One very fine specimen taken at Pago- 

 Pago, Samoa, September 2, 1931, in shallow water. 



