318 



membranous ectooa'cium, and the endoooecium may be provided with a number 

 of very small scattered pores. Multiporous rosette-plates or nuiltiporous pore- 

 chambers occur as a rule, very seldom uniporous pore-chambers. 



To this genus I must refer the following species: E. (Romancheina) Martiali, 

 Jull.', £. (Mucronella) cocc/nea, Abildg., E. (?Sniittia) ./ficAso/n', Waters^, E. (Mucr.) 

 praestaiis, Hincks, E. (Mucr.) contovla. Busk, E. sduroylossa n. sp., E. (Porina) 

 larvalis, Mac Gill.' and E. (Mucronella) labiata, Boeck*, the last species having 

 no avicularia. Of the species mentioned E. Martiali is provided with uniporous 

 pore-chambers. 



Escharoides praestans Hincks. 



Mucronella praestans Hincks, Annals Nat. Hist., ser. 5, Vol. X, 1882, p. 1(J8, 



PI. VII, fig. 1. 

 (PL XVII, figs. 4 a-b). 



The zooecia hexagonal, ascending strongly both from the proximal end and 

 from the sides towards the strongly projecting, spout-shaped peristome, which 

 has no median tooth and often projects so freely, that regarding the zooecia 

 from the frontal aspect we can only see the distal half of the four spines. The 

 zooecia, the slightly luberculated surface of which is marked with fine, radiating 

 stria;, are provided at the margin with one or more circles of round pores 

 separated by rib-shaped projections. Each lateral wall has 3 — 6 connections with 

 neighbouring zooecia, and these are represented sometimes by multiporous pore- 

 chambers, sometimes by multiporous rosette-plates. On each distal wall there are 

 either three pore-cbambers or two with an intermediate rosette-plate, and one of 

 the two adjacent half lateral walls is likewise provided with 2 — 3 pore-chambers, 

 one of which however is also connected with the distal wall. 



Goecia are wanting on the colony investigated, but are described and figured 

 by Hincks, from whose account it appears, that they must be i)rovidcd wilh an 

 ocecial cover, as otherwise they would not have pore-canals. 



The avicularia, which are lacking on numerous zocecia, appear only singly 

 towards the one lateral margin and are of a considerable size. The strongly 

 prominent chamber provided with some scattered pores has a well-developed 

 cryptocyst and the lyre-shaped mandible tends obliquely outwards and proxi- 

 mal ly. 



Found on a Mollusc shell from Stewart Island, New Zealand (Zoological Mu- 

 seum, Cambridge, Engl.). 



» 45, p. 60. = 114, p. 87. ' 107, p. 18<l. * lOll, p. 21. 



