RKSUMS OK DKEP SKA INVKS IKJATION'S M A IT.KSTON K. I 1 i) 



above ; margins raised ; iinhricated. 'I'livrostome seini-ellipt.ical 

 (?). Vihracula 3 mm. \ouif, curved, tlexihle. 



Ohs. — Tliis is a very inberestinj:; form ; the sliape of the zoarium 

 is unusual, not circular hut elliptical with a lon<i;itu(Iinal ridge in 

 the centre. The membranous layer covers the whole surface so 

 that the exact sha|)e of the thyrostomes cannot be seen, they 

 being hidden by the closed opercular ; but the great peculiarity 

 of the species is the (comparatively) enormous length of the 

 vil)racula, 3 mm. 



Sklenaria flagellifera, var. minor, va7\ nov. 

 (Plate XXXV.) 



Zoarium Hat, suborbicular. Zooecia elliptical or irregularly 

 hexagonal ; margins raised. Thyrostome semi-elliptical. Vi- 

 bracula long and curved. Some of the marginal zooecia have 

 inverted infundibular peri.stomes. 



Ohs. — The specimen froni which this variety is described may 

 possibly be a young form of S. flagellifera, as the zooecia are 

 similar, also the vibracula, which however are not so long, but 

 the peculiar inverted infundibular peristomes seen on six of the 

 marginal zooecia justify not merely making it a variety but 

 possibly considering it as a distinct species, for I have never seen 

 this form of peristome in any Selenaria ; it is however present in 

 the marginal or basal zooecia of some Biporce ; it is not present 

 in the specimen of S. flagellifera. 



X 



