part 3] TEIASSIC CllIlSOlDS FEOM XEW ZEALAND. 249 



Sides smooth, faintly convex, rising about O'l mm. above tlie 

 suture-line. 



Suture-lines broadly and irregularly waved, not crenelate in the 

 ordinary sense. 



The joint-face shows faint traces of radiating ridges in the 

 central area, but at about halfway to the periphery these die away 

 with varjdng rapidity. The number of these ridges is estimated 

 at 25-; it is not possible to see whether they are grouped by fives 

 to any extent. The ridges and grooves are of equal size. The 

 peripheral half of the joint-face is almost smooth; but in places 

 there can be detected the traces of the radiate ridges, also faint 

 concentric grooves. The whole surface is thrown into very slight 

 broad waves, 5 or 6 in all, which bear no obvious relation to the 

 ridges. 



The lumen is obscurely pentagonal, and is indicated in the fossil 

 by a calcite infilly;ig of darker colour. Within this, at all four 

 places where it is exposed there is visible a structure with a light 

 border, which may be interpreted as probably an axial vessel, 

 2)0ssibly wdth five chambers (compare Bather, 1909, pp. 41, 42). 



Relations of the species. — The circular section, smooth 

 exterior, apparent absence of cirri, small lumen, and radiating 

 ridges on the joint-face : all these are characters of the Encrinus 

 stem, and to that genus the present specimen probably belongs. 

 None the less, in the absence of evidence from the crown, and in 

 view of the distinctive characters of the joint-face, it is safer 

 to give the specimen foi- the present the non-committal name 

 Entroclius. 



From all known species of JEncriniis, and from all Entrochi as 

 yet described from Triassic rocks, the Entroclius here described 

 differs in the substitution of broad irregular waves for the radi- 

 ating ridges in the ])eripheral area of the joint-face, resulting in a 

 waved non-crenelate suture-line. Hence the trivial nam.e, tcndatiis, 

 waved. 



E:sTE0CHUS TERXio, sp. nov. (Figs. 3-7, p. 248.) 



Diagnosis. — Trochitie Avith smooth, faintly convex side-faces; 

 ratio of height to diameter=0"35 (more in young) ; suture de- 

 pressed, crenelate; joint-face with a raised central area, and from 

 20 to 30 well-marked ridges, of which two-thirds tend to constitute 

 forked pairs starting from the centre, and one-third to be shorter 

 ridges intercalated between the pairs. 



Locality. — Caroline Cutting, Hokonui Hills. Southland (N.Z.). 



Horizon. — Kaihiku Beds, Ladino-Carnic. 



Material. — Various imprints of columnals on a fragment 

 of calcareous sandy matrix with iron-stained imprints and in- 

 ternal casts of Sjyiriferina fragiUs, Dlelasma cf. liunalayana. 

 Men fzeliopsis, and Isocrinus. British Museum, Greological Depai-t- 

 ment, E 2218G. The imprints of columnals may be gi-ouped under 

 three headings. (A) A stem-fragment consisting of 3 columnals, 



