117 



Ihe distal wall by their proximal, sometimes almost tap-like, proximal end, and 

 hy means of a unij)orons rosette-plate are connected with the proximal zod'cium, 

 whilst their more arched basal surface is grown together with the frontal mem- 

 brane of the distal zowcium. Seen from the frontal surface the\' are egg-shaped, 

 seen from the side triangularly rounded, and their subopercuiar portion, which 

 is turned in towards the distal zoa-cium, forms an obtuse angle with the semi- 

 circular, outwards facing mandible which has a chitinous margin, but no > lucida' . 



The ooecia are large, broad, flatly arched, rugged, and furnished with a pro- 

 truding proximal rim, which is separated from the other part by a ring-shaped 

 impression. From each of the distal zowcium's calcified lateral margins issues a 

 narrow, obliquely triangular calcareous plate, which pushes in between the endo- 

 oa'cium and the ectooa-cium, and comes to lie over the former with its 

 concave lower surface. It is furnished w'ith a shorter inner, and a longer outer, 

 free marginal edge. 



The colony is bifurcated u]i to three times and the zofx-cia arranged in four 

 longitudinal rows. 



A single colony of this species was taken by the Ingolf Expedition at hit. 

 600 17/ N jQ„g^ 540 05/ y^r at a depth of 1715 fathoms. 



All the Farciminaria species which Busk has described in the Challenger 

 Report except F. atlantiai undoubtedly belong to this genus. 



Farciminaria Busk p. p. 



The zou'cid have a larger or smaller number of small, spine-like processes, 

 which are placed either on the frontal membrane or on the lateral margins; the 

 (Hx'cid are surrounded by kenozoa'cia; an (tinciilariiiin similar to that found in 

 Coliimnaria occurs in a few cases; the colony not jointed. 



F. uncinata Hincks. 

 Annals Nat. Hist. ser. 5, Vol. XIV, 1884, pag. 277, PI. VIII, Og. 2. 



(I'l. I, lij<s. 10 a— 10(1). 

 The zooecia, the whole frontal surface of which is membranous, evenly in- 

 crease in breadth towards the broadedly rounded distal end, which is sometimes 

 furnished with two short spine-like processes. The. frontal surface a little proxi- 

 mally to the operculum has on either side a denticle similar to these, and a 

 similar denticle, which varies somewhat in size and is sometimes double, arises 

 from each lateral margin a little distally to the proximal end of the zooecium. 

 It points in towards the middle line of the zocvcium, and seems to be placed 

 under the frontal membrane. The triangular distal wall has within its basal rim 



