30 A MOXOOUAPU OP TIIL; TEKTIAKV I'OLYZOA OF VICTORIA. 



exciivated in the middle so as to form two stout, sliarp toeth, or Avith tAvo distinct 

 teeth; two similar denticles from the \\p])cr lip, but situated more posteriorly. 

 Avieularium replacinii' a zocecium, upper margin raised and ovcr-arcliiny, mandible 

 very large and semicircular. 



Var. prrampla, AVaters. Zocecia elongated, (|uudrate or hexagonal, truncated 

 abo\ e and below. 



Var. rfUHsta, fig. 21'. Branches sl(»nder. Zooecia very long, nppcn- part enlarged, 

 lower contracted. Ovarian pore a narrow transverse slit. 



S. I'. ; M.C. ; 15. Ileccnt Australia. 



In tlie recent typical C. rigida the zocecia are exceedingly regular in tlieir 

 shape, being almost uniformly rhomboidal, with a sharp angle above and below ; 

 occasionally, however, they are slightly truncated. Characteristic specimens occur 

 among the fossils. Tiu; form described by Waters as C. perampla differs only in 

 the zooccia being much more elongated, with the ends straight, so that the outline 

 is hexagonal or nearly ([uadrate. The avicularia also seem to be rather smaller. 

 In the var. ceiiusta ilwAOCRCiSi are very long, the upper part being enlarged and the 

 lower contracted, the latter part being occasionally extremely narrow. 



6. C. fjracilis, Busk. PL III., lig. 20. 



Salicornaria gracilis, Busk, B.M.C., Ft. I., p. 17 ; C.P., Ft. I., p. 93. 



Cellaria gracilis, McG., P.Z.V., 49. 



IJraiiclies slender, cylindrical. Zocjccia distant longitudinally ; separated by 

 narrow raised margins ; an inner raised ridge, wide and cucuUate above, less 

 proiiiiiicnl and ronuiiig an angle l)elow, enclosing a depressed surface ; thyrostomc 

 Avith tlic IdWiM' lip roundt^d and projecting forwards, with a minute denticle on each 

 side. Avicularia on special cells, Avith the upper margin projecting forwards. 



S.F. ; M.C. Living. Australia. 



7. C. divaricata. Busk. PI. III., fig. 25. 



Salicornaria divaricata, Busk, C.F., Ft. I., p. 90; Cellaria dioaricala, 

 McG., C.V. 



I have a few small fragments Avhicli I refer rather doubtfully to this recent 

 species, a full description of Avhich is given in the " Challenger " Polyzoa. They 

 may, however, belong to C. hicornis or lennirostris, the descriptions of Avhich are 

 also given in the same ])lacc. The discrimination of the smaller, and in fact of all 



