ON TWO NEW ITRYAr'TINETJ.TDA l-^ROM SAGAMI EAY. 05 



trast to -E. MarshaJli with respect to their dimensions and general 

 configuration of the body. Hence notwithstanding the above-mentioned 

 agreement in spicules, I have considered it expedient to separate the 

 two forms. At least the new form is to be considered as a well different- 

 iated variety of the foL-m found in Genkai Sea. It is nesdless to mention 

 that E. MarsJiaJIi is at once distinguishable fi'om E. imperkdh Ij. 



HYALONRMA OYATUM, u. sp. 



While examining the HijaJonnna of Hagami Bay, I recently came 

 across a form which must be erected into a new species. 



H. ovatum is represented in my collection l)y three small, rather 

 mutilated specimens preserved in alcohol. 'l\vo of them were collected 

 by myself, midway between the little island of Hashima and the 

 headland of Mana/.uru on the eastern coast of Pi'ovince Izu, from a 

 muddy bottom and a depth of about '2.50 fathoms. At this locality they 

 were the only Hyalonema I could obtain. The remaining one specimen 

 was brought to me by my collecfcer, together with a number of young 

 H. apertum, from the neighbourhood of Okinose, under which name 

 the submarine plateau extending westwards from Cape Sunosald, is 

 known. IMacroscopically all my specimens present httle or no specific 

 characteristics, so that they had long been included among young speci- 

 mens of iJ. apertum, until I came to examine their spicules in detail. 

 Nevertheless there can be no doubt of their close aflinity to the species 

 just mentioned. 



The sponge-body is egg-shaped, broadest near the upper end or at 

 about the middle. Tjength of body in my largest specimen, 28 mm.; 

 length of the exposed basal tuft in the same sp3cimen, 85 mm.; 

 breadth of the same just below the basal pad, 15 mm. The tuft-fibres 

 are not twisted, nor is any Palythoa present. It is probable that I 

 have only .young specimens, whose tuft, on furtlier growth of the 

 body, would acquire a Palythoa-investment and gradually liecome 

 tv/isted, as I know is the case dnring the development of 77. apprtiim. 

 The gastral opening at the superior end is very narrow and unfurnished 



