ON TWO NEW lIEXACTilNELLlDA FEOM SAGAMI BAY. 93 



The numerals iiidicAts the ordei' of formation of cleavage-segments. 



Pig. 1. Egg. in the chorion sack, fresh. Zeiss, 4. B. 



Fig. 2. 4 blastomere stage, from the vegetative pole, fresh. A, left 

 anterior blastomere ; B, right anterior blastomere ; C, right 

 posterior blastomere; D, left posterior blastomere. Z., 4. B. 



Fig. 8. 24 cell stage ; from the animal pole, fresh. Z., 4, B. 



Fig. 4. Segmentation of entomesoderm cell at the 28-cell stage ; 

 transverse section. Z., 4. D. 



Fig. 5. Segmentation of fourth and seventh generation of micro- 

 meres ; from the vegetative pole, horizontal section. Z., 

 4. D. 



Fig. G. A stage before division of the Unite soderm ; froin the vege- 

 tative pole, horizontal section. Z., 4. D. 



Fig. 7. Segmentation of t/vv/ifsocZe'r^M and of entodermic macromcres ; 

 from the vegetative pole. Z,, 4. D, 



Fig. 8. The same stage, transverse section. Z., 4. D. 



I'ig. y. Formation of the first mesoderm cell ; from the vegetative 

 pole, horizontal s3(;tion. Z., 4. D. 



Fig. lO. The same, trcUisverse section. Z., 4. D. 



Fig. 11. A stage with three germinal layers established, sagittal 

 section. Z., 4. D. 



On Two New Hexactinellida from Sagami Bay. 



By I. Ijima, Ph. D. 



EUPLECTELLA MARSHALLI, u. sp. 



A few miles off Cape Simosaki in Pro v. Awa, from a depth of 

 100-150 fathoms and a bottom of gravels and shells, I have collected 

 over a dozen sp3cimons of an apparently new Euplectella, to which 

 I herewith propose the name of E. MarshaUi. In fresh state, they 

 were of a soft sahnon-[jink color. 



