THE ANNALS 



MAGAZINE OF NATURAL HISTORY. 



[FOURTH SERIES.] 

 No. 110. FEBRUARY 1877. 



IX. — On two Vitreohexactinellid Sponges. 

 By H. J. Carter, F.R.S. &c. 



[Plate IX.] 



The following descriptions of Eurete farreopsis, n. sp., and 

 MyJiusia Grayi^ Bk., respectively have been made more espe- 

 cially for two purposes, viz. the former to show the mode of 

 growth in Farrea occa, which has not yet been described from 

 a living specimen, and the latter to illustrate the only known 

 living species possessing the structure of the Ventriculidce 

 that has come to notice. 



I am indebted to my friend Dr. J. Millar for the specimen 

 of Eurete farreopsis^ which has been whitened at the expense 

 of the soft parts — for sale, not for the purposes of natural his- 

 tory, — and, from being very delicate in the last-formed por- 

 tions, has been much broken. Nevertheless sufficient remains 

 for description and for the accompanying illustration of the 

 the general form, which has been taken from a photograph ; 

 while the elementary parts more particularly have been ob- 

 tained from minute shreds of dried sarcode still left about the 

 skeleton, in which arc wrapt up the rosettes and smaller spi- 

 cules of the species. 



The specimen of Mgliusia Gragi^ Bk., belongs to the British 

 Museum ; and through the obligingness of Dr. Gunther I am 

 enabled to give an illustration of this, also delineated from a 

 photograph. It was taken alive, as the presence of the sarcode 

 m many parts indicates ; but, appearing very insignificant from 

 it5 smallness, it has not received that treatment which its 



Ann. & Mag. N. Hist. Ser. 4. Vol. xix. 9 



