part 3j TKTASSIC CRINOIBS PEOM T^BW ZfiALAlN^D. 247 



8. The Triassic Ceiis^oids from New Zealand, collected hy 

 Dr. C. T. Teechmanjs'. By JFeaxcis Aethue Bathee, 

 M.A., D.Sc, F.R.S., F.G.S. (Read February 7th, 1917.) 



De. Teechmain^n has kmdly presented to the British Museum 

 (Natural History) a stem-fragment and a piece of calcareous sand- 

 stone containing imprints of various columnals, and has asked me 

 to furnish some notes on them. Since these are the first Triassic 

 crinoids to be described from New Zealand, their adequate descrip- 

 tion seems warranted, despite their fragmentary condition. All are 

 believed to represent new species. 



In 1909 most of the Triassic crinoids known up to date were 

 discussed by me in ' Triassic Echinoderms of Bakony,' i and the 

 terminolog}^ here employed is explained in that memoir. Since 

 then the only professedly new forms made known are those con- 

 tained in Clark & Twitchell, 1915, -'The Mesozoic & Cenozoic 

 Echinodermata of the United States ' (U.S. Greol. Surv. Monogr. 

 liv). These, therefore, are discussed here at greater length than 

 the better-known European species, and for one of them a new 

 specific name is proposed. 



[Mr. Gr. C. Martin, in a paper on ' Triassic Rocks of Alaska,' 

 published December 1916 (Bull. Geol. Soc. Amer. vol. xxvii, 

 pp. 685-718), but not received here until June 1917, records 

 specimens of ' Pentacriims.'' These, which belong to two new 

 species of Isocrinus, are also described and compared.] 



EXTEOCHUS UXDATUS, sp. uov. (Figs. 1 & 2, p. 218.) 



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

 ratio of height to diameter circa 0*18 ; joint-face with about 

 25 coarse ill-developed ridges, radiating from the centre about 

 halfway to the periphery, where they merge into a few broad, 

 irregular waves. 



Locality. — Eighty- Eight Valley, Nelson, (N.Z.). 



Horizon. — Kaihiku Beds, Ladino-Carnic. 



Material. — A stem-fragment consisting of 21 columnals or 

 portions of columnals, broken cleanly across at the joint-face, 

 between the 5th and 6th, and worn all down one side, especially 

 towards the other end of the fragment. British Museum, Geological 

 Department, E 22185. 



Description. — Cylindrical. 



Length of fragment = 38 mm. 



Average height of columnal, as calculated =1*58 mm. 



Greatest height of a columnal, as measured — 1 "8 mm. 



Least height of a columnal, as measured=l'5 mm. 



Diameter =8'2 mm. at the more imperfect end; =10 mm. at the other. 



Ratio of height to diameter = 0' 18. 



Diameter of lumen = about 0'8 mm. 



^ ' Result. Wissensch. Erforsch. des Balatonsees ' vol. i, Pal. Anhang. 



