REPORT OF THE ECHINOIDEA—MORTENSEN 101 
The localities New Zealand and Zanzibar, given by L. Agassiz for 
his Laganum rostratum, are evidently due to erroneous labels. The 
variety is till now known only from the Malay region. 
From the shore at Capunuypugan Point (east coast of Mindanao), 
May 9, 1908, there is a single specimen, 56 mm. long, which has much 
the appearance of Peronella lesueuri, but the periproct is situated 
more inward than usual in that species, and, what is more important, 
the madreporic pores are placed in irregular furrows as in Laganum; 
there are only three genital pores. AJso the outline is irregular. It is 
quite evident that this is an abnormal specimen, and I think it must 
be a hybrid of Peronella lesueuri and a Laganum, perhaps L. depres- 
sum. It is regrettable that only this specimen was taken; had a fair 
number of laganids been collected at this locality, it would probably 
have been possible to arrive at a more definite conclusion as to the 
affinities of this specimen. 
PERONELLA (7?) PELLUCIDA Déoderlein 
Peronella (Laganum) pellucida DODERLEIN, Arch. fiir. Naturg., vol. 51, p. 32, 1885. 
Peronella pellucida H. L. CLark, Hawaiian and other Pacific Echini, Clypeastridae 
... Scutellidae, p. 53, pl. 142, figs. 1, 8-10, 1914. 
Locality.—Station 5156, Tinakta Island (lat. 5°13’ N., long. 119°56’ 
KE.) ; 33 meters; February 21, 1908. One naked but otherwise well- 
preserved test. 
Remarks.—This specimen I refer with some little doubt to the 
Japanese Peronella pellucida. It agrees with that species in its 
general shape, in the characters of the petals, and in the almost central 
position of the periproct, which is also naked as in pellucida. But it 
is somewhat lower than usual for pellucida and the periproct is tri- 
angular, with the point inward, not round as otherwise in pellucida; 
further it has the genital pores developed at a length of 24 mm., while 
in specimens from Japan the genital pores are only about to appear 
at a length of 27 mm. 
It is, of course, quite possible that these characters come within the 
range of variation of Peronella pellucida; but with the material avail- 
able at present this cannot be ascertained definitely. From a zoogeo- 
graphical point of view there can be no objection to referring this 
specimen to Peronella pellucida; it is true, the species has till now been 
recorded only from Japanese seas, but I have some tests (unfortu- 
nately dead) from the Kei Islands, which almost certainly belong to 
P. pellucida, so that this species may be expected to occur all over the 
_ Malay region. On the other hand, the small depth, 33 meters, at 
which this specimen was taken is unusual for P. pellucida, which is 
otherwise more of a deep-sea form, hitherto not known from less than 
(7 meters. After all, then, I think it the best course to refer this 
specimen provisionally and with reservation to Peronella pellucida. 
