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INTRODUCTION. 



Expedition 1904-1905 — List of Species — (New Species indicated by an *). 



Protankyra abyssicola. 

 *Chiridota aponocrita. 



Chiridota rigida. 

 *Myriotrochus bathybius. 

 *Myriotroehus giganteus. 

 *Molpadia bathybia. 



Molpadia holothurioides. 



Ceraplectana trachyderma. 



Cucumaria abyssorum. 



Echinocucumis bitentaculata. 



Pelagothuria natatrix. 

 *Parelpidia anamesa. 



Scotoplanes murrayi. 

 *Pcriamma tetramerum. 



Peniagone intermedia. 



Peniagone setosa. 



Oneirophanta mutabilis. 

 *Scotodeima parvispiculatum. 



Scotodeima setigerum. 



Laetmophasma fecundum. 



Capheira sulcata 

 *Euphronides dyscrita. 



Euphronides verrucosa. 



Psychropotes raripes. 



Benthodytes glutinosa. 

 *Benthodytes regularis. 



Benthodytes sanguinolenta. 

 *Mesothuria megapoda. 



Mesothuria multipes. 



Synallactes aenigma. 

 *Synallactes 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. 



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- 



