GYMNOSPERM^. 21 



C. suhangulatus^ Bow., op. cit., p. 60, is here described as Callitris. 



C. corrugatus, Bow., op. cit., p. 61 {Solenostrobus^ Endlicher), is founded upon a 

 very indistinct specimen (now in the British Museum), each valve of which seems sub- 

 divided. It has no distinctly Cupressineous character. 



C. sulcatus, Bow,, op. cit., p. 61 {Solenostrobus, End!.), is a five-valved fruit, the 

 original of which has not been identified. It suggests no Cupressineous affinity. 



C. semiplotus. Bow., op. cit., p. 62 {Solenostrobus, Endl.). This somewhat resembles 

 the preceding form, but cannot now be found. 



C. tesselatus, Bow., op. cit., p. 63. The small specimen figured (pi. x, figs. 30 and 

 31) is very indistinct, but possesses five scales, articulated at the base, and with traces of 

 a central plate. It does not appear to be Cupressineous; but figs. 26 and 27 of the 

 same plate and species are here referred to under Callitris curta. 



The cones in several of the existing species are exceedingly variable in size and 

 appearance, so much so that it might even be possible that the two species to be described, 

 totally unlike as they appear, may eventually have to be united. 



1. Callitris curta, BoiverbanJc sp. Plate IX, figs. 7 — 21. 



CuPKESsiNiTEs cuRTUS, C. CoMPTONii, C. THUJOiDEs, C. cEASSUs, Bowerbauk. Foss. 

 Fruits and Seeds of the London Clay, pp. 56 — 59, pi. x, 

 figs. 9, 20—23, 34, 1840. 



CUPEESSITES CUKTUS, &c., linger. Synopsis Plant, foss., p. 192, 1845. 



Callitrites curttts, C. Comptoni, C. THUJOIDES, Hybothta ceassa, Endlicher. 

 Synopsis Conif., pp. 274, 275 ; Goeppert, Monogr. der 

 foss. Coniferen, pp. 170—180, 1850; Unger, Gen. et 

 Spec. Plant, foss., p. 345, 1850. 



Callitris curta, C. Comptoni, Hybothya cbassa, Ettingshausen. Proceed. Royal 

 Society, vol. xxix, p. 392, 1879. 



London Clay, Isle of Sheppey. 



The cone is conical, and consists of four, five, or rarely six valvated scales. These 

 valves are sometimes very unequal, but more often sub-equal, very thick and ligneous, 

 more or less obtusely pointed, rugose, and somewhat keeled exteriorly, and apparently 

 smooth and concave on the inside. No distinct umbo is preserved, but all are to some 

 extent water-worn. All those preserved are dehiscent, and partly filled with pyrites, 

 only one exhibiting the summit of the central column. The foot-stalk is thick. The 

 cones are variable in size, the largest measuring two centimetres in diameter, and many 

 are slightly distorted. 



In spite of the varying number of scales I can see no characters by which those 

 species described by Bowerbank, enumerated above, can be separated ; for it is note- 



