ANNOTATED LIST. 59 
that cancellata and its allies are not congeneric with flavescens and cumingii, and further- 
more that a large series of cancellata, showing growth stages, would make clear that too 
many species are here recognized in that section of the genus. 
Ferdina is undoubtedly an East Indian genus reaching Fiji on the east and Zanzibar 
on the west. The type locality given for F. cumingii is probably erroneous, as explained 
below under that species. Naturally, in view of the rarity of the species, nothing is known 
of their habits. All are of relatively small size, though kuhlii is said to be 5 inches across. 
Ferdina flavescens. 
Gray. 1840. Ann. Mag. Nat. Hist., 6, p. 282.—De Loriol. 1885, Mem. Soc. Phys. Hist. Nat. Geneve, 29, No. 
4, p. 47, pl. xv, figs. 8-Se. 
This species is not rare at Mauritius, and de Loriol has figured it well. His largest 
specimen has R=38 mm.; Gray’s specimens were a trifle smaller. The color of dried 
specimens is said by Gray to be ‘‘yellow, brown varied.” De Loriol’s colored figure is 
varied yellow-brown, but it is not made clear whether the figure is colored from life or from 
a preserved specimen. There is no record for this species away from Mauritius, except 
possibly Pfeffer’s (1896) record of a single arm of F. kuhlii from Tumbatu Island, Zanzibar, 
which Ludwig (1899) very naturally suggests may prove to be an arm of flavescens. But 
it is hard to see how Pfeffer could have confused the two species. 
Ferdina cumingii. 
Gray. 1840. Ann. Mag. Nat. Hist., 6, p. 283. 
There are two puzzling things about this species, and I regret I can throw no light 
on either of them. The first is in regard to the locality; it is highly improbable that Ferdina 
occurs on the west coast of South America; nevertheless Gray and Perrier, in giving the 
locality of the type material, both say ‘‘West coast of Colombia.” Gray, however, adds 
““H. Cuming esq.’”’ as the collector, and it is well known that Cuming collected extensively 
in the Philippines and also that his locality labels were not reliable. There seems to me 
little doubt, therefore, that the type locality for this species is in the Philippine Islands. 
The second puzzling matter is in Gray’s innocent-looking statement: ‘‘the larger 
tubercles on the side are red when the granules are rubbed off, which they often are.” 
Anyone who has seen the marginal plates of cancellata or one of the allied species will at 
once infer that Gray is mistaken about the granules being ‘‘rubbed off,” and will recognize 
the condition of the marginals characteristic of the cancellata group. But Perrier, after 
study of Gray’s material, says ‘‘tout le corps” is covered by a uniform granulation finer 
than in flavescens, and he does not even hint that some of the marginals are bare. I am 
at a loss to explain this puzzle but it occurs to me that Gray might have found a specimen 
of the cancellata group with his cwmingii material and this was subsequently removed 
before Perrier saw the material. A reéxamination of the British Museum Ferdinas would 
possibly clear up this difficulty. 
Ferdina offreti. 
Koehler. 1910. Indian Mus. Ast., p. 143, pl. xvi, figs. 2-5. 
The description and figures of this fine species leave nothing to be desired except that 
I do not think there is any inner series of actinal intermediate plates (see next species). 
The holotype was taken near Little Andaman Island in 10 fathoms, but a much smaller 
specimen was collected in 34 fathoms near Ceylon. 
Ferdina glyptodisca. 
Fisher. 1913. Proc. U.S. Nat. Mus., 46, p. 213.—1919, Bull. 100 U. S. Nat. Mus., p. 370, pl. 56, fig. 5; pl. 95, 
figs. 4-4b; pl. 104, fig. 2; pl. 106, fig. 4. 
There seems to be no ground for doubt that this species is distinct from offrett. In 
one point, however, I think the difference imaginary. Fisher says: ‘‘inner series of small 
