122 INTRODUCTION. 
Expedition 1904-1905 — List of Species — (New Species indicated by an *). 
Protankyra abyssicola. 
*Chiridota aponocrita. 
Chiridota rigida. 
*Myriotrochus bathybius. 
*Myriotrochus giganteus. 
*Molpadia bathybia. 
Molpadia holothurioides. 
Ceraplectana trachyderma. 
Cucumaria abyssorum. 
Echinocucumis bitentaculata. 
Pelagothuria natatrix. 
*Parelpidia anamesa. 
Scotoplanes murrayi. 
*Periamma tetramerum. 
Peniagone intermedia. 
Peniagone setosa. 
Oneirophanta mutabilis. 
*Scotodeima parvispiculatum. 
Scotodeima setigerum. 
Laetmophasma fecundum. 
Capheira suleata 
Euphronides verrucosa. 
Psychropotes raripes. 
Benthodytes glutinosa. 
*Benthodytes regularis. 
Benthodytes sanguinolenta. 
*Mesothuria megapoda. 
Mesothuria multipes. 
Synallactes aenigma. 
*S ynallactes triplax. 
Pseudostichopus mollis. 
Stichopus variegatus. 
Holothuria arenicola. 
Holothuria atra. 
Holothuria cinerascens. 
Holothuria imitans. 
Holothuria impatiens. 
Holothuria languens. 
Holothuria lubrica. 
Holothuria marenzelleri. 
Actinopyga lecanora 
Actinopyga parvula. 
*Euphronides dyscrita. 
The 1904-1905 collection was always considered by Mr. Agassiz an excep- 
tionally important one, an opinion based in part on the remarkably interesting 
trawl-hauls at several stations. Thus at station 4647, nine species were obtained, 
representing eight different genera, and two of the species are very notable new 
forms. At station 4649, five species of five genera were taken, one of the species 
being new. At 4651, seven species of seven genera, were secured and at 4656, 
five species of five genera. At 4658, eight species of seven genera, with two 
new species, were taken, and again at 4672, eight species of eight genera, with 
two new species, were brought in. It is not surprising therefore that Mr. 
Agassiz looked upon the collection as of great value. That it is not of more 
unusual importance, is owing to the facts that even the new forms nearly all 
belong to genera previously known from the eastern Pacific, while the ALBA- 
TROSS 1891 expedition secured a large proportion of the species occurring in the 
deep waters of the region. 
The new species described in the present report belong to the four families 
Synaptidae, Molpadiidae, Elpidiidae, and Holothuriidae, but the three new 
members of this last family are all members of the subfamily Synallactinae. The 
identification of deep-water holothurians, especially synallactids and elpidiids, 
is rendered difficult by the bad condition in which they reach the surface. It 
seems to be very exceptional for them to be taken in uninjured condition. More- 
