í ^ A ae ١ ۱ 1 d | 
82 | 
` Anthomorpha, Bornemann. Flindersicyathus, Bedford. 
Anulocyathus, Vologdin. ; Orbicyathus, Vologdin. 
- Araneocyathus, Vologdin. Pycnoidocyathus, Taylor. 
Archaeocythus, Billings. Family Syringocnemidae, Taylor. 
Archaeopharetra, Bedford . Syringocnema, Taylor. 
Ardrossacyathus, Bedford. Syringocyathus, Vologdin. 
Archaeoscyphia, Hinde. 
Bicyathus, و‎ d Order CROMMYOCYATHINA, Bedford. 
Cambrocyathus, Okulitch. ` H 
GENEE Family Exocyathidae, Bedford. 7 
E B . ES 
Copleicyathus, Bedford. Ajacis, GE å 
L Loculicyathus, Vologdin. Exocyathus, edford. سا‎ 
(erazi (eie à Metaldetimorpha, Bedford. 7 
ETT ea The following genus is of doubtful affinity. 
Metaldetes, Taylor. Nipterella, Hinde, 2 
rreta Egiz Family Vesiculoidae, Vologdin. | 
Protopharetra, Bornemapn. Labyrinthomorpha, Vologdin. | 
Retecyathus, Vologdin. | | 
Sibiricyathus Vor Ze The development of the following ‚order and -its | 
| Brennen Bedford. relationship to other orders of Pleospongia is not Ye 
Ga Malal known. e 
SE Gte Order HETAIRACYATHINA, Okulitch. | 
Family Hetairacyathidae, Bedford. ; 1 
Hetairacyathus, Bedford. ا‎ ess 
Family Metacoscinidae, Bedford. 
Archaeosycon, Taylor. 
Aptocyathus, Vologdin. 
۱ Eucyathus, Vologdin. 
Metacoscinus, Bedford.‏ ا 
Members of the following order are sponges of hollow ` 
spherical. oval, or gastrula-like forms; development not یا‎ 
yet known. i 
As Paracoscinus, Bedford. 0ئ0‎ 
dy Pycnoidocoscinus, Bedford. . Order URANOSPHAERINA, Bedford ` ` NOI 
AIR i Tabulocyathus, Vologdin. Family Uranosphaeridae, Bedford. ا‎ 
ا ا‎ Family Flindersicyathidae, Bedford. a Uranosphaera, Bedford. ۱ E 
D Beltanacyathus, Bedford. The following genus is of doubtful affinity: AX. 
1 
Ethmophyllum, Meek. : Haguia, Walcott. 
