8 ^Ir. A. W. Waters on 



Patagonia or elsewhere — and nolomale is a Mediterranean 

 form, while mUneaua is a SontluMMi II(Mnisphere form. 



Iilmnnea notomah has the rijilit and left series well separated, 

 and iUisk says '"' the series on either side are separated l)y a 

 wide interspaee," and what he fijjures pi. xii. «, as spreading 

 between the series, is the ovicell, whieh is often a narrow 

 band along the median line, hardly at all raised. The dorsal 

 surface is, as a rule, much hollowed out, and tlie outer 

 zooceia are usually visible on the dorsal surface. The zoarium 

 is frequently contorted, so that the older pai t may be seen full 

 face, while the next branches are seen laterally, showing much 

 the same structure as 7. coittorta, B., whieh is allied. 



From between Fayal and Pico (Azores), 50-90 fath., 

 * Challenger,' there are several specimens of a very similar 

 Idnionea, with smaller dimensions, which seems to be the 

 /. peiri as described by Canu and Bassler ^, and from the 

 same dredging 1. bifrons. Waters, is connnon, looking like 

 a double Idmonea, recalling at first /. notomule growing back 

 to back. Examining one surface, which we may call the 

 frontal, there are series of zocEcia on each side of the median 

 line ; turned over what is now the dorsal surface has just the 

 same appearance, and we hardly know whether to consider it 

 as Idmunea or Kntalopliora. 



Jullien and Calvet have described 7. bifrons, W., as 

 Biidinonea faya/ensis f, Ilageuow J considered that Goldfuss 

 had describecl Jdmonea disticha as like a double Idmonea, and 

 has separated from Goldfuss's material of /. disticha the 

 the double one as disticha and those with a dorsal surface 

 as dorsaln, Hag. The description and figures given by 

 Goldfuss do not show that it was double. If it has to be 

 separated from Idmonea it then falls into Bisidmonea, d'Orb.§, 

 a genus made for a Jurassic (Bathonian) fossil. 



We thus have the same structure as Idmonea, Bisidmonea, 

 d'Orb., Biidnionea, J. & C, Tubigera, d'Orb. 



At one time I thought that I had found T. petri from the 

 Mediterranean, but, as there is some doubt^ it is omitted. 

 The figure and description of d'Archiac || might well belong 

 to otiier species, as well -d^jjetri, though, having several figures 

 of Canu and Bassler, we can take /. ^>e/ri as the species 



* Loc. cit. p. 781, pi. 139. figs. 1-13 (non pi. 137) (1920). 

 t Campagiie de rElirondelle, p. 158, pi. xviii. figs. 3 «, 3 6 (1903), 

 X Bry. Mjiastricht. p. 30, pi. ii. fig. 8 (1851). 

 § Pal. Fran? p. 720, pi. 762. figs. 10, 11, 12. 



II " Fossile.s des Environs de Bayonne," Mem. Soc. G(5ol. de France 

 ppr. 2. vol. ii. p. lao, fig. 1 1 (1846). ' 



