REPORT ON THE HOLOTHURIANS COLLECTED BY THE UNITED STATES FISHERIES STEAMER ''ALBATROSS" IN THE NORTHWESTERN PACIFIC DURING THE SUM-MER OF 1906. By HmosHi Ohshima, Of the Tokyo Imperial University, Japan. The collection of holothurians made by the United States Fisheries steamer Albatross during her cruise in the northwest Pacific Ocean in the summer of 1906 was exceedingly rich. Its study was originally assigned by the United States Bureau of Fisheries to the late Prof. K. Mitsukuri, but after his death in September, 1909, was transferred to the writer. The material was found to be all but untouched by the late professor, only two species of Molpadia having been worked out, one of which, Ankyroderma diomedise, was described in his posthu-mous work, Studies on Actinopodous Holothurioidea. The specimens contained in nearly 200 bottles and vials are refer-able to 95 species and 1 subspecies, belonging to 37 genera. The following 3 could not, however, be specifically determined owing to the imperfectness of the specimens or to their young state: Paelopatides (f), ep. Cucumaria, sp. (juv.)-Anapta (?), sp. The following 46 are new to science : Synallactes multivesiculatus. S. gilberti. Bathyplotes ostergreni. Mesothuria media. Pseudostichopus aleutianus. Ps. molpadioides. Ps. arenosus. Ps. nudus. Ps. unguiculatus. Capheira mollis. Deima mosaicum. Orphnurgus rigidus. Pannychia moseleyi virgulifera. Ilyodsemon miurense. Peniagone japonica. Achlyonice monactinica. Scotoplanes theeli. Benthodytes gotoi. Molpadia diomedise (Mitsukuri). M. clarki. M. infesta. Gaudina ludwigi. Cucumaria ijimai. C. lamperti. C. spinosa. C. sluiteri. C. constricta. C. globosa. Thyone punctata. Th. parva. Th. bicornis. Th. imbricata. Pseudocucumis dactylicus. Ps. watasei. Ps. sagamiensis. Ps. tabulatus. Proceedings U. S. National Museum, Vol. 48— No. 2073. 213
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