58 A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 



A A'ory small spocios. Outside tlio raisfvl tubuliforous portion of tho zoopcium 

 thoro is a nnrrow, smootli vim. 'I'ho tul)os of tho outer rows are consideraljly nioro 

 elovatod, and aro sonictimcs pointinl so as to rosemhle inverted funnels, 'i'liere are 

 frequently several small tuhes above the thyrostomc, and occasionally on the smooth 

 marginal ])ortion of the zo(eeiuiii. Waters describes a short trianajular avicularium 

 as occasionally siliiated above the thyrostome on one side. It is veiy closely allied 

 to C. tiihiilifrra, described by Ilincks from Port Jackson (A. M.N. II., July, ISSl), 

 in Avhich, howev(>r, (he thyrostome is much hirger. AValers records C. tiihnlifrrd 

 from ]\[u(ldy Creek, but it does not occur among my specimens. 



3. C. ra(Ji,ila, Moll. s]). PI. VIII., fig. 9. 



Cribrilino racVwIa, Ilincks, B.IM.P., 18.") ; Waters, Q.J.G.S., 18S2, p. 20;') ; hi, 

 18S5, p. 292 ; McG., P.Z.V., 187. A Pull list of the many synonyms of this species 

 will be lound in Ilincks' flM.P. and JNIiss Jelly's Catalogue. 



Zooecium encrusting. Zocecia ovate, a series of 7-12 ridges on each side, with 

 intervening perforated grooves, radiating fi-om a median elevated line ; thyro.stome 

 rather shnllow, arched above, straiglit below, usually with several spines on the* 

 upper margin ; a round pore, sometimes absent, below the loAver lip, frequently 

 situated in a separate triangular area ; a few scattered avicularia among the zorecia, 

 with long, narrow, pointed mandibles. Ocecia galeate or globose, with a vertical or 

 oblique keel. 



S.P. ; M.C. A common cosmopolitan species. 



4. C. coyinihi, nsj). PI. VI IT., figs. 10, 11, 12. 



Zocecia distinct, ovate or subrotund, irrcgulai'ly arranged, very convex ; ten or 

 twelve ridges on each side radiating from the centre, which has no distinct median 

 line, the intervening grooves with large pores; thyrostome lofty, arched and 

 expanded above, straight below ; peristome raised on the sides and above, with a 

 stout, pointed ])rocess at its lower part on either side, directed upwards and forwards ; 

 an avicularium (usually absent), with a broad obtuse or rounded mandible, project- 

 ing from the summit of the zoocciiun. 



S.P., M.C, C.B., G. 



The specimens are all small, and most are portions of cylindrical branches. In 

 some specimens the oral processes are not very distinct, and th(> avicularia exist only 

 on a few of the zooccia. The ridges are occasionally vei-y i)rominent, the 1oa\ er edge 

 of the thyrostome (formed by first rib) being then very thick and conspicuous. 



