ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 439 



aforesaid walls of the atrium. It is very remarkable that these walls 

 should have this origin in this form ; for in the AscidicB they are the 

 result of evagination of the internal layer, though even there their 

 really mesodermic origin appears to be indicated by the development 

 within them of the muscles and blood-vessels. 



Queensland Bryozoa.* — Mr. W. A. Haswell records twenty- 

 seven new species (and a new genus) of Bryozoa (eighteen figured) 

 from Holborn Island, near Port Denison and the Great Barrier Reef, 

 the bottom, at a depth of about 20 fathoms, being apparently covered 

 with little else than Bryozoa intermixed with Plumulariidse and 

 Sertulariidje and a few shells. Bad weather prevented extended 

 examination of this remarkable bed. The sheltering influence of the 

 Great Barrier is probably a sufficient explanation for the abundance 

 of the Bryozoa at so slight a depth. 



The new genus (with one species) is SpJiCBropora (fossa), the most 

 remarkable feature of which is the circular pit at its upper pole, always 

 present and in the same position, and large enough to admit the point 

 of an ordinary stout sewing-needle. It is • 75 mm. in diameter at 

 the mouth, and penetrates about half the thickness of the zoarium, 

 gradually narrowing as it descends. From the description the 

 signification of the pit does not seem quite clear, as it might either 

 depend upon the shape of the substance upon which the zoarium 

 has grown, or it may represent the central cell with which we are 

 acquainted in such species as Sticlioporina Heussi Stol., Batopora 

 rosula, &c., or even the depression in Cellepora glohiilaris, with which 

 the Australian species has much in common, and we think it will 

 be found that the specimens should be classed under Cellepora. 



The new species belong to the genera Crista (1), Piistulipora (1), 

 Onchopora (3), Scrupocellaria (2), Membranipora (1), JBiJlustra (2), 

 Lepralia (6), Cellepora (2), Eschara (2), HemescTiara (1), Vesicularia 

 (1), Conescliarellina (2). Selenaria (1), and Myriozoum (1). 



In regard to nomenclature, we may remark that Mr. Haswell 

 describes a species as Membranipora cervicornis nov., but as this name 

 has already been used by Mr. Busk for a well-known species, it must 

 of course be changed ; Cellepora Icevis nov. is undesirable, seeing that 

 Macgillivray called an Australian species C. Icevis Flem., a name used 

 by Fleming, Blainville, Johnstone, &c., and which Mr. Busk gives as 

 a synonym of C. ramulosa. 



Myriozoum australiense nov. is an old and common friend from the 

 Australian tertiary beds, where it is known as Spiroporina vertebralis 

 Stol. ; and Mr. Haswell will find in the recent forms (if his specimens 

 comprise the two stages) that in one part of the branch the centre 

 shows the characteristic spongy axis, while in other parts the cells 

 are distinctly separated and do not meet in the centre. This stage is 

 shown in his figure 10. 



New Zealand Fossil Bryozoa.f — The Kev. J. Tenison- Woods 

 describes a few New Zealand Bryozoa (and Corals) ranging from the 



* Proc. Linn. Soc. N. S. Wales, v. (ISSO) pp. 33-40 (3 pis.). 



t Pal. New Zealand, pt. iv., Colon. Mus. and Geol. Surv. Dept., 1880. 



