TROPICAL PACIFIC HOLOTHURIOIDEA. 151 
Actinopyga lecanora. 
Miilleria lecanora JAEGER, 1833. De Holothuriis, p. 18. 
Actinopyga lecanora BRronn, 1860. Thierreich, 3, p. 403. 
A specimen of this wide-spread Indopacific species was taken February 3, 
1905, at Manga Reva, Paumotu Islands, on the coral reef, thus extending the 
known range far to the southeastward. The specimen is now very strongly 
contracted but the specific characters are distinguishable without difficulty. 
Actinopyga mauritiana. 
Miillleria mauritiana Quoy ET GaImMaARD, 1833. AsTRoLABE Zooph., p. 138. 
Actinopyga mauritiana FisHEeR, 1907. Proc. U.S. Nat. Mus., 32, p. 648. 
It is rather remarkable that while the 1899-1900 expedition brought home 
six specimens of this well-known species from at least four islands in the Society 
and Paumotu groups, the species was apparently not met with by the later 
expedition, although the latter took the preceding species at Manga Reva. 
The specimens are chiefly large adults but the one from Fakarava is only 20 
mm. long and one from Papeete is less than half grown. The latter is notable 
for being colored like lecanora, the area around the anus being abruptly and con- 
spicuously lighter than the ground-color of the body. The smallest specimen 
is of unusual interest because there are few grains in the ventral skin and the 
rods there are larger than those of the dorsal surface. If the identification of 
this specimen is correct, the characteristic ventral grains do not appear until 
the animal is more than 20 mm. long. No doubt the growth-stages of this Acti- 
nopyga would afford a very interesting study. The specimens in the present 
collection were taken at :— 
Rangiroa, Paumotus, September 23, 1899. 
Papeete, Tahiti, Society Islands, September 28, 1899. 
Makatea, Paumotus, October 6, 1899. 
Fakarava, Paumotus, October 12, 1899. 
Actinopyga parvula. 
Milleria parvula SELENKA, 1867. Zeits. f. w. Zool., 17, p. 314. 
Actinopyga parvula Fisuer, 1907. Proc. U.S. Nat. Mus., 32, p. 645. 
There are sixteen small specimens 15-35 mm. long, collected at Easter 
Island, December 20, 1904, which seem to belong to this remarkably wide-spread 
species. The color ranges from brown to almost black dorsally, but is gener- 
ally lighter ventrally. Some specimens show distinct blotches of darker color 
on the back. All the specimens have anal teeth but all five teeth are not equally 
developed in every case. This little holothurian is certainly a puzzle. It 
