18 Mr. R. Kirkpatrick on 



surface flat and punctured, dorsal surface smooth, ven- 

 tricose ; lateral surfaces with three large round pores ; orifice 

 subquadrate, with a concave lower border. 



A small vertically-placed avicularium with pointed mandible 

 on each side of the oral end of the cell. 



Hab. Growing on Algce, Tizard Reef, 27 fath. 



Bugula scaphoides, n. sp. (PL IV. fig. 1.) 



Zoarium reddish brown ; branches slender, spreading hori- 

 zontally ; about eight to ten cells to each internode ; zooecia 

 alternate, boat-shaped, broad at the oral end, much contracted 

 below, the area occupying almost the whole front of the cell ; 

 small stalked avicularia very convex dorsally, and with curved 

 beaks, rising from the narrow produced portion of the cell. 



Ocecium "? Stout branching chitinous tubes given off from 

 the dorsum of each cell. 



Dimensions of zooecium : length '9 mm., breadth 2 mm. 

 „ ,, avicularia : length '08 mm., breadth '04 mm., 



height (including stalk) - 08 mm. 



Hab. Tizard Reef, 27 fath. 



Membranipora hastilis, n. sp. (PI. V. fig. 3.) 



Zoarium incrusting. Zooecia large, oval ; front entirely 

 membranous ; operculum without a hinge ; placed transversely 

 at the head of each zooecium an ear-shaped vibracular cell, 

 toothed on one margin, with a vibraculum shaped like a 

 double-edged spear. 



Hah. Incrusting coral ; Macclesfield, 36 fath. 



In the position and shape of the vibraculum this species 

 resembles certain forms of Cupularia. The present form is 

 simply incrusting, the zoarium not presenting any definite 

 shape. 



Cribrtlina annulata, Fabricius, var. setosa, n. var. 

 (PI. V. fig. 4.) 



The zooecia are large, with from 6-8 rows of pores on each 

 side of a slightly marked central ridge. The proximal border 

 of the orifice is pectinate. At the head of each zooecium a 

 small square avicularian cell, with an acute vibraculoid 

 mandible. 



Hab. Incrusting shell ; Tizard, 27 fath. 



Microporella coscinophora, Reuss, var. (PI. IV. figs. 5, 5 a.) 



Eschara coscinoiihora, Reuss, Foss. W. Tertiarb. p. 67, pi. viii. fig. 20 ; 

 Stoliczka, Sitzungsb. Akad. Wiss. Wien, Bd. xiv. Abth. 1, 1862, 

 pi. ii. fig. 11, pi. iii. figs. 1, 2. 



Zoarium forming slender, flat, bilaminate branches, from 1 



