258 



pore surrounded by a ring Nvliich is continuous with the longitudinal ridge. The 

 aperture is provided with well-developed, distinct hinge-teeth and has a proximal 

 concave margin. 



Strophipora Harveyi Wyv. Thompson. 

 Catenicella Harveyi Wyv. Thompson, Natural History Review, V, 1858, p. i;57. 

 — — Wyv. Thompson, Proced. Dublin Univ. Zool. and Botan. 



Associat. I, p. 81, PI. VII, figs. 1, 2. 

 Strophipora Harveyi Mac Gillivray, Transact. R. Society of Victoria, 1895, 



Vol. IV, p. 17, PI. II, ligs. 9—12. 

 (PI. XXI, figs, fi —6 f). 

 The zooecia are of an oi)long, (juadrangularly oval form, nnd Ihe frontal sur- 

 face, which is less strongly arched than the basal surface, is most strongly arched 

 immediately on the proximal side of the aperture, from which it descends to- 

 wards the ])roximal end. 



The lateral chambers. The scapular chamber is everywhere, except on the 

 adzooecial side of the mother-zoo'cium, developed as an avicularium of medium 

 size at least, which is always directed so much towards tlie frontal surface that 

 the surface of the mandible can l)e seen, when the zoircium is regarded from 

 this side, and it may sometimes be altogether frontal. It has generally a some- 

 what ascending roof and may vary considerably in size, and in the single zoo'cia 

 at least a somewhat curved, rib-like thickening springs from its proximal end. 

 The supra-scapular chamber is a large, more or less ascending, membranous, 

 pointed cavity, while each half of Ihe frontal surface is occupied by a large 

 infra-scapular chamber, which communicates with Ihe zoo'cium through a longi- 

 tudinal row of 4 — 5 very scattered rosette-plates. The Iwo chambers are .sei)araled 

 by a longiludinally furrowed, narrow median ridge, and eacJi of them is se|)a- 

 rated from Ihe adjoining pedal chamber ])y a similar lateral ridge. Each of Ihem 

 is generally separated from Ihe sujjra-scapular chamber by Iwo low ridges, Ihe 

 starling point of wliich is on a level with Ihe Iransveise ridge of Ihe avicuiariuni 

 and which pass, one to Ihe margin of the aperture, the other to Ihe lateral ridge. 

 The membranous wall of the infra-scapular chamber runs out on each side into 

 two conical expansions, which are situated clo.se to the ai)erture, and a couple 

 of similar expansions may also ;ippear in Ihe distal |)arl of Ihe basal surface. 

 The two pedal chambers occupy the entire basal surface of the zoa'cium and are 

 likewi.se separated by a longitudinally furrowed median ridge, while again each 

 chamber is divided into Iwo unecpially large parts by an exlremely narrow, low, 

 compressed, longitudinal ridge, which appears in its outer half and serves to 



