214 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 48. 



Phyllophorus eylindricus. 

 Ph. glaucus. 

 Ph. diomedese. 

 Ph. minutus. 

 Psolidium vitreum. 



Ps. bullatum. 

 Protankyra kagoshimensis. 

 Txrdogyrus cidaridis. 

 Toxodora pacifica. 

 Myriotrochus mitsukurii. 



The following are reported for the first time from the northwest 

 Pacific: 



Mesothuria murrayi (Theel). 

 Orphnurgus insignis Fisher. 

 Psychropotes raripes Ludwig. 

 Euphronides depressa Theel. 

 Benthodytes sanguinolenta Theel. 

 Molpadia intermedia (Ludwig). 



M. musculus Eisso. 



M. spinosa (Ludwig). 



Cucumaria mosaica Kcehler and Vaney. 



P solus chitonoides Clark. 



Chiridota albatrossii Edwards. 



It may be worthy of note that the collection contains three new 

 cases of brooding holothurians, all belonging to Cucumarids, namely, 

 Cucumaria ijimai, C. lamperti, and Thyone imbricata. I may also 

 mention another fact which appears to me to have some significance 

 in connection with the breeding habit, namely, that in some holo- 

 thurians, such as Bathyplotes tizardi, ova are found attached about the 

 mouth in the male. 



It is also remarkable that in some deep-sea forms the ova are of 

 quite large size, those of Enypniastes eximia measuring 3-3.5 mm. and 

 those of Benthodytes gotoi and Euphronides depressa 2.5 mm. in diam- 

 eter. They exceed the previous record given by Ludwig for Bentho- 

 dytes sanguinolenta (2-2.2 mm.) . Another fact of some interest occurs 

 in some deep-sea forms. That the mesentery of the third limb of the 

 intestine is attached to the body wall along the ventral edge of the 

 right dorsal radial muscle has already been observed by Ludwig in 

 Benthodytes sanguinolenta, and the same peculiarity also occurs in 

 several others, such as Deima mosaicum, Pannychia moseleyi virguli- 

 fera, Ilyodxmon ijimai, I. miurense, Achlyonice monactinica, Scoto- 

 planes theeli, Psychropotes raripes, Benthodytes gotoi. This peculiarity 

 seems to be rather common among the Elasipoda. 



To the United States Bureau of Fisheries I tender my thanks for 

 permission to work on the valuable collection. I also extend my 

 thanks to Prof. I. Ijima, who has kindly given me a table in his Insti- 

 tute, and to Prof. S. Goto for reading the manuscript and making 

 suggestions. Further I wish to acknowledge my great indebtedness 

 to Miss Mary J. Rathbun who has kindly read the proofs. 



