116 



Family Farciminariidae Busk. 



(PL I, ligs. in-in). 



The zoa'cia as a rule slightly calcified, occasionally with a small secondary 

 cryptocyst, without true spines, furnished with an ohliipu-ly asceiuiing distal wall, 

 and separated by common lateral walls which are furnished with a small number 

 (2 — 4) of uniporous rosette-plates. The aviciilaria dei)endent, sometimes depressed, 

 sometimes strongly projecting. The o<vcia are endozooecial, generally more or less 

 projecting, occasionally surrounded by kenozoa'cia. 



The colonies are, in the hitherto known forms, dichotomously branched tufts, 

 with slender, prismatic, sometimes jointed segments, on which the zonccia are 

 arranged in longitudinal rows (generally 4 — 6) round an axis, formed by the 

 adjoining separating-walls. 



This family agrees with the Fhistridw in the possession of endozooecial otrcia, 

 and with most members of that family in its being furnished with unii)orous rosette- 

 plates. On the other hand it differs from the Fhistridcv in possessing dependent 

 avicularia, in the lack of hollow spines, in the absence of independent lateral 

 walls as also in the form of colony. 



Columnaria nov. gen. 

 Farciminaria, Busk p. p. 



The zooecia are without spinous processes; the distal wall has a number of scattered 

 nniporous rosette-plates. The oo'cia are strongly prominent and the cndoorrciuni 

 on each side partially covered bj' a little lamina of cryptocyst, which issues from 

 the respective lateral wall of the zooecium. Capitate (wiciilaria, attached to the 

 distal wall at their proximal part and firmly fixed wilii Ihcir basal wall to the 

 frontal membrane of the distal zoa'cium; the fiontal wall of the avicularia without 

 a calcareous transverse bar; the colony not jointed. 



C. borealis n. sp. 



(I'l. I, ligs. 12:i-]2c). 



The zooecia, the whole frontal surface of which is membranous without a 

 cryptocyst, have an elongated rectangular shape; the length is generally 4 — 4.5 

 times the breadth. The strongly ascending distal wall which is only half as broad 

 as the frontal area, is elongated pentagonal, or rounded wedge-shaped and furnis- 

 hed with 5 — 9 rosette-plates placed in 2 longitudinal rows. The side-walls, whose 

 distal half is furnished with 2 uniporous rosette-plates, increase in height towards 

 the distal end and terminate in a triangularly rounded, projecting corner. 



The avicularia, which appear in all zocecia are attached to the distal end of 



