212 Mr. li. Kirkpatrick on a 



attached to the fibre by an enveloping extension of the profusely 

 echmated layer over them. But the most striking part of all is 

 the sharply-defined and persistent character of the arapullace- 

 ous sacs, which, being comparatively scanty and more or less 

 separated, besides possessing an unusual degree of toughness 

 under manipulation, have enabled me to make with certainty 

 the observations above mentioned. 



p,g. — In the " Supplement " to the descriptions of Mr. 

 Wilson's sponges, published in the ' Annals ' of 1886, vol. xviii. 

 p. 271, for "Port Western" read "Western Port." And 

 for " Histiodermaj^ p. 452 et seq., read " Histodermay 



XXVIII. — Description of a neio Genus o/ Stylasteridse. By 

 R. KiRKPATEiCK, Assistant, British Museum (Natural 

 History). 



[Plate YIII.] 



The specimen described here was collected off Mauritius, and 

 obtained from Mr. De Robillard. No information was sent 

 concerning the depth at which it was found or the manner in 

 which it was obtained. 



Phalangopora, g. n. 

 Ramose Stylasteridaj with gastropores in a single linear 

 series on the anterior and posterior surfaces of the branches of 

 the colony ; with dactylopores arranged in a single linear 

 series on each lateral surface of each branch, and also irregu- 

 larly scattered. Mouth of each gastropore overarched by 

 a triangular scale ; dactylopores with nariform projections. 

 Both kinds of pores without styles ? 



Phalangopora regularis^ sp. n. (PI. VIII.) 

 Colony tlabelliform ; dichotomous branching fairly well 

 indicated in parts ; branches subcylindrical, flattened on 

 anterior and posterior surface ; parent branch 3 millim. in 

 diameter, terminal branches 1 millim. ; surface marked by 

 wavy ridges running in a longitudinal direction ; pores small, 

 gastropores measuring "5 millim. from side to side, "3 millim. 

 from before backwards, mouth opening obliquely and over- 

 hung by a triangular slightly convex scale with rounded apex ; 

 dactylopores oval in projection, slightly constricted in the 

 middle, long diameter "3 millim., transverse "15 millim., 

 height of nariform projections *15 millim. Ampullaj hemi- 

 spherical, 1*2 millim. iu diameter. 

 Loc. Mauritius. 



