ORTMANN I 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 Hincks). 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 Miinster. 



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. Zocecia hexagonal, with a raised border, 

 disposed quincuncially on both surfaces of the zoarium. Each zocecium 

 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 zocecia of Melicerita have the characteristic shape of 

 the family Cellariidce (genus Cellar ia Lamx., 1 8 1 2 = Salicornaria Cuv., 



