BRTOZOA FROM FRANZ-JOSEF LA.ND. 



171 



tubular pores do not appear as regular, and then the ridges are 

 seen between the pores. There are 9 tentacles. 



Loc. Very general from the Arctic Regions, also from olf the 

 British coast. Busk, ia his ' Challenger ' Eeport, gives Hornera 

 lichenoides from off the Argentine ; Kirkpatrick mentions it 

 from Port Phillip, and "Whiteaves from the St. Lawrence. 



Fossil. Prom the Crag; Victoria {MacG-illivray); Calabria, 

 Post- Pliocene {Neviniani). 



Jackson-Harmsworth Exp.: Lat. 77° 55' K, long. 55° 25' E., 

 115 fath., and lat. 77° 55' N., long. 55° IG' E., 130 fath.; oif 

 glacier between Cape Elora and Cape Grertrade, 30 fath. ; 

 50 miles N.W. of Cape Mary Harmsworth, 234 fath. 



8. DiASTOPORA OBELiA, var. ARCTiCA, uom. nov. (PI. 21. fig. 1.) 



Diastopora hyalina, forma obelia, Smitt, " Krit. Fort." 1866, pp. 396 

 & 421, pl. 8. fig. 8. 



The characters of the Franz-Josef Land specimens are well 

 represented by Smitt's figure, in which the position of the 

 adventitious tubule is different from that of the British and 

 Mediterranean D. ohelia, Johnst. 



There are large zooecia the ends of which are erect, and by 

 the side of these is a narrow adventitious tubule, which is the 

 termination of a fairly wide horizontal or erect tube, about half 

 the width of a zooecium. In the British and Mediterranean 

 _D. olelia, the tubule is in a line below the zocecial aperture, 

 while in the fossil B. hrendolensis, "Waters, the tubule rises up 

 by the side of a zocecial tube. It is a question whether the 

 differences mentioned justify the specific separation of the Arctic 

 from the better-known form of D. obelia. Smitt and others 

 speak of D. Jiyalina, and D. lujalina, forma obelia, but from the 

 tables of distribution &c. it is not always possible to know which 

 of the forms is being referred to. 



The ovicell extends over the entire distal end of the zoarium, 

 enclosing a very large number of zooecia (see PI. 21. fig. 1). 

 Neither in this variety nor in any specimen of D. ohelia have I 

 found " closures " of any kind, whereas in JD. sarniensis, Norm,, 

 there is a closure with a narrow tube at the end. 



There are 10 tentacles in D. obelia, from Naples. 



The Proboscina malaccensis, d'Orb.,* from the Straits of 

 Malasca, No. 13760, Mus. d'Hist. Nat. Paris, is Diastopora with 



* Paleontologie Fran9ais, vol. v. p. 847. 



