ORTMANN : TERTIARY INVERTEBRATES. 
65 
Our Patagonian specimens agree very well with the New Zealandian fos- 
sil, but they differ — as well as the latter — from the recent C. fistulosa in 
the absence of avicularia on the top of the cells. The ankylosis of the 
joints found sometimes in the recent form, and described by Stoliczka in 
the fossil form, is also exhibited in a few fragments of the Patagonian 
fossil. 
Our material is comparatively poor, consisting of a mass of fragments 
found in a small piece of rock. The structure of the surface is much ob- 
scured, only a few fragments showing the form of the cells with sufficient 
clearness. The form of the ovarian opening (which has sometimes a 
small tooth, according to Stoliczka) cannot be made out satisfactorily. 
Record of specimens : Shell Gap, lower horizon; numerous fragments. 
Distribution: Living, almost cosmopolitan (see Plincks). Fossil: Oligo- 
cene, Miocene, and Pliocene of Europe (see Stoliczka and Hincks) ; Mio- 
cene of the Orakei Bay, New Zealand (Stoliczka and Hutton, 1885 a, p. 
209). 
Affinities: If this is really the living species C. fistulosa , its range in 
time is from the Oligocene to the Recent times. But, as has been said 
above, our Patagonian form resembles more the New Zealandian Miocene 
form called by Stoliczka Salicornaria marginata Munster. 
Gen. MELICERITA M.-E. 
10. Melicerita triforis Ortmann. 
PI. XIII, Fig. 3“’ 6 . 
1900 Melicerita triforis Ortmann, in: Amer. Journ. Sci., v. 10, p. 370. 
Zoarium foliaceous, lobate. Zooecia hexagonal, with a raised border, 
disposed quincuncially on both surfaces of the zoarium. Each zooecium 
about as long as broad. Orifice transverse, crescentic, large, situated 
about in the middle of the cell. Ovicells immersed, inconspicuous, indi- 
cated only by an opening (special pore) in the summit of the cell. Besides, 
there are two openings in each cell, near the summit on each side of the 
mouth, which probably represent avicularia. No other avicularia dispersed 
among the other cells. 
Remarks : The zooecia of Melicerita have the characteristic shape of 
the family Cellariidce (genus Cellaria Lamx., 1812 = Salicornaria Cuv., 
