318 RECOKDS OF THE AUSTKALIAN MUSEUM. 



constrictions, but the tapering extremities are spiral as in ordinary 

 Ichthyosaurian coprolites. Both of the specimens are convex 

 on one side and faintly concave on the other. 



A section prepared for the microscope from the fractured end 

 of the incomplete specimen does not afford much information. 

 The ground mass is limonitic with scattered quartz grains, 

 but there are no fish scales or other minor exuvia;. 



ANNELIDA. 



Geuns Spirul.ea, Bronn, 1827. 



(Jahrb. Min., 1827, ii., p. 544). '^ 



Ohs. — Zittel tells^ us that Bronn selected the involute and free 

 species Serptda spiriilffa, Lamk., as the type of his genus Sph-alfca. 

 In the same year (1827), Def ranee proposed^ the name Bofularia 

 for this and other species, including both free and attached 

 Tubicolar Annelids. As it is very convenient to accept even 

 this artificial division of the genus Serjnda, I adopt Bronn's 

 term for those fi'ee involute species such as >S'. spiruJcm. Tubes 

 of this nature are met with in Oolitic, Cretaceous, and Tertiaiy 

 strata. 



Spirul.ea gregaria, s]}. not: 



(Plate Ivii. ; PL Ix., figs. 1-3). 



>Sp. Char. — Shell involute, concavo-sub-convex, from 5-15 

 millimetres in diameter, consisting of three or four wlaorls, 

 terminating in a free tube of variable length ; on the concave 

 aspect tlie whorls are telescopic, and individually rounded, but 

 on the sub-convex aspect each whorl is sloping and moreover less 

 faintly convex. Periphery convex, neither ridged nor angled, 

 section of tube round ; sculpture fine and concentric, the free tube 

 in some cases corrugated. 



Obs. — A hand specimen of calcai-eous shale is crowded on both 

 weathered surfaces with these involute tubes, in fact they chiefly 

 compose the rock, associated with a few small Belemnites. The 

 form is closely allied to *S'. concava, J. Sby.,'^ from the Upper 

 Greensand of the South of England. In some respects it also 

 resembles S. bognoriensis, Mantel,'' a Tei'tiary species, but 



2 Fide Bronn— Index Pal., Nomen., 1848, p. 1139. 



3 Zittel— Handb., Pal., 1 Abth., i., 3, 1880, p. .564. 

 " Defrance— Diet. Sci. Nat, xlvi., 1827, p. 321. 



« Sowerby— Min. Con., i., 1814, p. 125, pi. Ivii., f. 1-5. 

 '• Sowerby— Min. Con. vi., 1828, p. 294, pi. dxcvi., f. 1-3 



