Victorian Fossils, Fart XXII I. 393 



iidnate, slightly curved and directed upwards towards the axis, 

 inakiiig an angle of 18°. Gonothecae short, pyriform, situated 

 between the hydrothecae at irregular intervals; walls constricted 

 just below the circular orifice, as in Cryptolaria abi/ssicola, 

 Allnian.i These are best seen on the counterpart slab.2 



Length of axis, 32 nun. Approximate width of axis, .9 nnn. 

 Length of hydrothecae, 4 mm. Length of gonothecae, 1.75 mm. 



Observations. — The general habit of this species shows a paral- 

 lelism with a branch of Cryjytolaria ahyssicola, AUman, a species 

 previously mentioned, found living south of South Australia and 

 west of Tasmania, in 2600 fathoms. The points of similarity are 

 the straight or erect form of the axis, the regular disposition of 

 the hydrothecae, and the form of the gonothecae. 



EXPLANATION OF PLATES. 



Plate XIX. 



Pig. 1. — ArcJuieolafo'ea longicoriiis, gen. et sp. nov. x 5. la, 



gonotheca x 25. Lower Ordovician. Monegetta. 

 Fig. 2. — Mastigogra'ptus inonegetfae, sp. nov. x 4. 2«, gonotheca, 



X 16. Lower Ordovician. Monegetta. 

 Fig. 3. — Archaeocryptolaria skeatsi, gen. et sp. nov. x 5. Lower 



Ordovician. Monegetta. 

 Fig. 4. — Archaeocryptolaria recta, gen. et sp. nov. x 5. 4rt, 



gonotheca x 16. Lower Ordovician. Monegetta. 



Plate XX. 



F^ig. 5. — Archaeolafo'ea longicornis, gen. et sp. nov. Lower Ordo- 

 vician. Monegetta. 



Pig. 6. — Mastigograptus monegeftae, sp. nov. Lower Ordovician. 

 Monegettae. 



Pig- 7. — Archaeocryptolaria, skea'si, gen. et sp. nov. Lower Ordo- 

 vician, Monegetta, 



Pig. 8. — Archaeocryjytolaria recta, gen. et sp. nov. Lower Ordo- 

 vician. Monegetta. 

 (All the above photographs (figs. 5-8) are slightly larger than 



natural size.) 



Fig. 9.— Keduced from Kep. ('hall. Zool., vol. XXIII., 1888, Re- 

 port on the Hydroida, Pt. II., l)y Allnian, ]>!. XIX., 

 sliowing three species of Cryptolaria (1. C. fiahelhim. 2. 

 C. pulrheUa. 3. C. crassicaiilis). 



1 AUinan, loc. tit,., p. 40, pi. xviii., fijr. Zu. 



2 In coll. of C;eol. Dept. Melbourne Univeriitv. 



