318 



A. W. WATERS ON FOSSIL CHILOSTOMATOT7S 



Species of Polyzoa from the Coll. of Prof. Harvey," Zool. Bot. Assoc. 

 Dublin, vol. i. 1859, p. 83, pi. viii. fig. 2. 



Cells almost cylindrical, contracted towards the base. There have 

 been avicularia at both sides above the aperture. Aperture not 

 perfectly preserved, rounded on the distal edge, with a constriction 

 on each side near the base ; proximal border (smaller than figured) 

 slightly rounded. Vittae distinct, with double row of pores in a 

 depressed area. 



The vittse of the Catenieellce are not correctly figured and descri- 

 bed in the British-Museum Catalogue ; for, instead of being raised 

 areas with raised warts, they are sunken areas enclosed by raised 

 edges, and along these sunken areas there are one or two rows of 

 pores, according to the species. The vittge, however, when covered 

 with a membrane, may appear like raised areas ; but an examination of 

 the British-Museum specimens shows that the structure was not quite 

 correctly appreciated, and it would be a great advantage if any one 

 who undertakes the revision of the Catenicellidse would give figures 

 with all the membranes removed. The size of the recent and fossil 

 species is identical. 



In order to compare Catenicella, JSerupocellaria, and other more 

 or less corneous forms, I made a series of calcined preparations of 

 most of the recent specimens in my possession. 



This is allied to 0. perforata, B. 



Log. Living ; Bass's Straits (T.), Australia (my coll.). 



7. Catenicella solida, sp. nov. Plate XVI. figs. 37, 38. 



Single cell oblong to cuneate, double cells ovate to globular ; a 

 straight band or ridge down the front of each cell, and a similar 

 raised band separating the two zocecia ; a small curved ridge forming 

 a circle on each side of the aperture, and below the aperture a linear 

 band on each side. On each side of the central bands large pores 

 (sometimes double pores). Oral aperture round above, with a small 

 sinus on the proximal edge ; a denticle on each side of the top of the 

 sinus. Dorsal surface with several large depressions, bounded by 

 bands similar to those on the front ; the bands, both front and dorsal, 

 are grooved. Avicularia very minute, angular or rounded (about 

 half the length of the oral aperture), on the side of the cell near the 

 distal end. 



This is common in the Yarra-Yarra formation, where, however, 

 the cells are usually found double, and the number of single cells 

 seen is very limited. The bands vary somewhat in shape ; but fig. 38 

 shows the typical form. This has many points of relationship with 

 C. joonderosa, Wilson (Micr. Soc. Vict. vol. i. p. 63, pi. v. figs. 1- 

 3), a living species ; also with C. carinata, Busk ; and O. species xii. 

 of Wilson (loc. cit. p. 63), a fossil from Spring Creek, but I am 

 unable to identify it with any described species. 



8. Catenicella internodia, sp. nov. Plate XVI. figs. 78, 79. 

 Zoarium in distinct internodes of several zocecia arranged in a 



bicellate series. Zocecia suboblong, with a wide ridge down the 



