:392 Frederick Chapman : 



base, as in M. tenulramosus ; otherwise the shape of the cups are 

 similar. The axis in M. monegettae shows less tendency to branch 

 than in M. temviramosiis, but it iii difficult to be emphatic on this 

 point on account of the incompleteness of the specimen. 



Cenus Archaeocpyptolaria, gen. nov. 



Generic Characters. — Hydrocaulus slender, nxore or less erect 

 or slightly flexuous, length up to about 30 mm. Hydrothecae cylin- 

 <irical or long-conical, narrowing very slightly towards the base; 

 adnate and attached for some distance along the axis; aperture 

 'Circular and lip slightly everted. Periderm coarsely wrinkled or 

 :scaly. Gonothecae elongately pyriform and incurved to the axis. 



This generic type resembles the living genus Cryptolaria, Busk/i 

 ■which is practically confined to the Pacific and Southern Oceans. 



Archaeocryptolaria skentsi, sp. nov. (Plate XTX , l^'ig. 3; 

 Plate XX., Fig. 7). 



Descrijytion. — Axis flexuous, but not so much as in the preceding 

 species; with a tendency to sigmuidal curvature. Hydrothecae 

 shorter than in Archaeolafom longicornis, and not so tapering at 

 the junction with the stem, Avhere thay are decurrent for 

 ;some distance and suddenly bent outwards, almost at right angles 

 in the majority of cases. No gonothecae noticed in this form up 

 to the present. 



Length of hydrosome about 25 nun. Width of axis, .5 mm. 

 Length of hydrothecae about 2.5 mm. 



Observations. — The long cylindrical form of the hydrothecae in 

 this species, together with the geniculate bend after leaving the 

 axis is like that seen in Crypt olaria angulata. Bale,- a living 

 ypecies found at 100 fathoms in the Great Australian Bight. 

 'Cryptolaria flahelliim. Allman,^ also shows a strongly flexed liydro- 

 theca, which, however, is curved rather than sharply bent. The 

 periderm in the fossil shows the transverse rings as seen in the 

 living forms. 



Archaeocryptolaria recta, sp. nov. (Plate XTX., Figs. 4. 4a ; 

 Plate XX., Fig. 8). 



Descrijytion. — Axis straight, comparatively stout. No branches 

 In described examples. Hydrothecae long, tapering to liase, 



1 Quart. Joiirn. Micr. Sci., ser. i., vol. v., 18'>7, p. 178. Itep. Chall. Zool., vol. xxiii., 1888. 

 AUiuitn, p. 37. See also this paper, pi. xx., figr. 9. 



•2 Biol. Results, "Endeavour," vol. ii., pt. iv., 1914, p. 166, pi. xxxv., fi<j. 1. 



3 Rep. Chall. Zool. vol. xxiii., pt. Ixx , 1888: Hydroida, pn ii. p. 40, pi. xix., fijjs. 1, In. 



