124 A MONOGRAPH OP THE TERTIARY POLYZOA OF VICTORIA. 



10. I. dwergens, n.sp. PL XVIII., fig. 1. 



Branches dichotomously divided, rounded in front, flattened behind. Zooecia 

 in oblique lateral rows, semispiral or irregularly arranged, numerous, distinctly 

 separated by longitudinal grooves and narrow lines ; thyrostome circular, turned 

 slightly forwards. Dorsal surface smooth, with narrow, raised white lines diverging 

 from the centre to the circumference. 



B. 



The zooecia are arranged in series, but these are very irregular. Several are 

 distinctly bilateral, in some there is only one series obliquely across the front, while 

 again in others the series are much broken and many of the zooecia irregularly 

 placed. The dorsal surface is smooth but has a series of narrow, raised, white lines 

 diverging upwards and outwards from the central line. Of these there are generally 

 two to embrace the outer extremities of the zooecial series. This species forms a 

 transition to the genus Filisparsa, and is evidently closely related to Jullien's 

 Tenia solida. 



11. I. semispi?*alis, n.sp. PI. XVIII., fig. 4. 



Branches round, dichotomously divided. Zooecia very long, in spiral series 

 nearly extending the whole circumference of the branch ; surface punctate ; 

 thyrostome elliptical, slightly projecting forwards. 



M.O. 



Allied to I. bifrons (Waters), but there is no break in the zocecial series 

 in front. 



12. /. milneana, D'Orbigny. PL XVII., figs. 1, 2. 



I. milneana, D'Orbigny, Voy. dans 1' Amerique meridionale, V., p. 20 ; Busk, 

 B.M.O., III., 12 ; id., C.P., II., 13 ; Smitt, Eloridan Bryozoa, Pt. I., 8 ; McG., 

 P.Z.V., 68 ; I. giebeliana, StoL, Poss. Bry. Orakei Bay. 



Zoarium spreading; branches dichotomously divided, broad, anterior surface 

 convex. Zooecia in opposite curved series of 2-5 on each side, and usually an azygos 

 one in the middle, distinct, but closely connate, except at the extremities, and much 

 curved forwards ; surface rough, with close-set small raised pores ; internal aspect 

 of zooecia similarly furnished. Dorsal surface with longitudinal ridges separated by 

 sulci, and in older parts transversely corrugated. 



M.O. ; B. Living. South America, Plorida, Australia. 



I am not sure that some of the specimens I have referred to this may not 

 belong to the closely-allied living I. interjuncta (McG.). 



