CHAUNOPLECTELLA SPIXIFERA. 71 



exactly after the manner of Euplectellid florieomes. I have found 

 this to be of mucli more general occurrence on the excurrent, 

 than on tlie incurrent, surface of parenchymal septa. Sometimes, 

 as before mentioned, a sigmatocome has been found hanging on 

 the end of an outstanding spicular ray which belonged to an 

 indubitable parenchymalia. 



CHAUNOPLECTELLA SPINIFERA. N. sp. 



PI. v., figs. 14-17 and PL YL, figs. 1-S. 



In the Science College Collection I have discovered a specimen 

 (No. 459) which bears close resemblance to Chaunopleciella 

 cavernosa but seems to deserve erection into a distinct species. 

 I propose to call it CltaunoplecteUa spinifera, in view of the 

 spine-bearing character of some of its dermalia. 



Another, much smaller and evidently very young specimen 

 (Sei. Coll. Mus. No. 430), which I am inclined to refer to the 

 same species, has also come under my observation. As it differs 

 in some respects from the type-specimen, it will be well to treat 

 of it separately. I shall refer to it as the second specimen. 



The type-specimen (PI. VI., figs. 1-8) comes from Homba, 

 Sagami Sea, where it was taken at a depth of about 572 m. ( = 

 313 fathoms). It is unfortunately incomplete in that it lacks 

 the basal part, which had been torn off and lost. It represents 

 a thick-walled sac of about the size and shape of a small plum, 

 measuring, say, 30 mm. in diameter. The wall is 9 mm. thick 

 in the thickest part; it thins but little towards the sharp- edged 

 oscular margin, which is only partially preserved. The osculum 



