152 THE ECHINODERMS OF TORRES STRAIT. 
Its general geographical distribution is still uncertain, owing to the ease with which it is 
confused with other species. Unfortunately, the fine photographs in the ‘‘ Revision of the 
Echini”’ (pl. xine, figs. 8 to 10), said to be this species, are apparently Peronella lesueurt. 
Owing to this fact, I suspect the records of decagonale from Torres Strait really refer to 
P. lesueuri, which is common there. Déderlein (1914) has himself stated that the speci- 
mens from Torres Strait and the Aru Islands, which he called decagonale, are really lesueurt. 
Laganum depressum. 
Agassiz. 1841. Mon. Ech.: Mon. Scut., p. 110, pl. 23, figs. 1-7. 
This species was taken by both the Challenger and the Alert in the Torres Strait region 
(Prince of Wales Channel), but we did not meet with it. It has a widespread distribution 
in the Pacific Ocean and occurs in the East Indies, the Philippines, and on the coast of 
Ceylon. Its occurrence on the coast of Africa needs confirmation. 
Peronella lesueun. 
Laganum lesueuri Agassiz. 1841. Mon. Bch.: Mon. Scut., p. 116, pl. 24, figs. 3-6. 
Peronella lesueuri A. Agassiz. 1872. Rev. Ech., pt. 1, p. 148. 
We found this fine laganid at Friday Island and later it proved to be abundant at 
Badu, but we saw no indications of its occurrence at the Murray Islands. It occurs on the 
southern coast of Queensland and on the coast of West Australia as far south as Fremantle 
at least. It is common in the Aru Islands and northward through the East Indies to Hong- 
kong and southern Japan. It is not known as yet from the Pacific Ocean proper. 
Peronella orbicularis. 
Echinodiscus orbicularis Leske. 1778. Add. ad Klein, p. 144. 
Laganum orbiculare Agassiz. 1841. Mon. Ech.: Mon. Scut., p. 120, pl. 22, figs. 16-20. 
Peronella orbicularis A. Agassiz. 1872. Rev. Ech., pt. 1, p. 149. 
This is another laganid whose distribution is very imperfectly known because it has 
been so often confused with other species. It is known certainly from the Persian Gulf, 
the East Indies, the Philippines, and Torres Strait. The Challenger took it at the last- 
named place, but when the ‘‘Report on the Echini’”’ was published, the specimens were 
not separated out from the large number of laganids listed as Peronella decagonalis, and 
hence orbicularis does not figure in that Report. On the extensive sand-flat southwest 
of Friday Island we found three bare tests of this species, but we did not meet with 
living specimens. 
FIBULARIIDZE. 
Fibularia volva. 
Agassiz and Desor. 1847. Cat. Rais. Ech., p. 142. 
(Plate 35, Figures 6 to 9.) 
On a small beach on the eastern side of Badu many bare and bleached tests of young 
Breynias occurred, November 1, 1913, and among them half a dozen tests of a Fibularia 
were also found. On account of the form and the character of the petals, I felt no hesita- 
tion in referring them to volva until Dr. Mortensen called my attention to the matter of 
madreporic pores, when, to my astonishment, I found there are a number of such pores 
present instead of one, as in typical volva. As I had previously considered the presence of 
a single madreporic pore one of the family characters in the Fibulariide, these Torres 
Strait specimens are rather disconcerting. As they are not in any too good condition, 
however, I have decided to list them under volva with the mere statement that they prob- 
ably represent an undescribed species. Photographs are given (pl. 35, figs. 6 to 9) of one 
of the largest merely to show the form of the test and the relative sizes of the peristome 
and periproct. According to Bell, the Alert took volva in Prince of Wales Channel. 
