REPORT ON THE ECHINOIDEA COLLECTED BY 
THE UNITED STATES FISHERIES STEAMER 
“ALBATROSS” DURING THE PHILIPPINE EX- 
PEDITION, 1907-1910. PART 2: THE ECHINO- 
THURIDAE, SALENIIDAE, ARBACIIDAE, 
ASPIDODIADEMATIDAE, MICROPYGIDAH, 
DIADEMATIDAE, PEDINIDAE, TEMNOPLEURI- 
DAE, TOXOPNEUSTIDAE, and ECHINOMETRI- 
DAE 
By Tueropor Mortensen 
INTRODUCTION 
The first part of the report on the Echinoidea of the Albatross 
Philippine Expedition,: published in 1927, dealt with the family 
Cidaridae. The present second part is concerned with the families 
Echinothuridae, Saleniidae, Arbaciidae, Aspidodiadematidae, Mi- 
cropygidae, Diadematidae, Pedinidae, Temnopleuridae, Toxopneusti- 
dae, and Echinometridae. 
The Echinothuridae are represented in the collection by 16 species 
and 2 varieties, and there are in addition a couple of young specimens 
of Sperosoma not indentifiable with certainty as to species. The 
Saleniidae are represented by only one species with a variety, and the 
Arbaciidae by 4 species. The Aspidodiadematidae are represented 
by 3 species, the Micropygidae by 2, the Diadematidae by 7, the 
Pedinidae by 2, the Temnopleuridae by 15 (with in addition 2 un- 
identifiable tests), the Toxopneustidae by 2, and the Echinometridae 
by 8. 
Of the Echinothuridae, four represent new species, one of these 
being the type of a new genus, Hemiphormosoma, also, there are two 
new varieties. ‘These were briefly described by me in 1934.2, A new 
variety in the Saleniidae found in the collection was described at the 
same time. 
There are described herein four new species, one in the Diademati- 
dae (Hremopyga debilis), one in the Pedinidae (Caenopedina annu- 
lata), one in the Temnopleuridae (Microcyphus excentricus), and one 
in the Echinometridae (Hchinostrephus formosus). 
1U. S. Nat. Mus. Bull. 100, vol. 6, pt. 4, pp. 248-312, 22 figs., 33 pls., 1927. 
2? Vid. Medd. Dansk Naturh. Foren., vol. 98, pp. 162-164, 1934. 
