900 DR. F. A. BATHER ON 



of tlie posterior basal, and at the lower angles of the I'iglit and 

 left posterior radials, which meet above. Two pairs of infrabasals 

 fused ; the remaining small infrabasal being the anterior. Radial 

 facets small. (Arms unknown.) Stem-facet from "13 to "2 

 diameter of cup. (Stem unknown.) 



The diagnosis is based on the characters of the genotype, since 

 H. piriformis must be removed from the genus. The somewhat 

 hexagonal shape of the anal opening suggests that it was closed 

 by six valvular plates. 



Genotype. — H. schneideri. 



Distribution. — This species, as well as " Hypocriniis " piri- 

 formis, has been found only in Timor, in beds which are either 

 Permian or Carboniferous. Recent workers have regarded them 

 as Permian, but the Echinodeims at present described would 

 rather favour a Carboniferous age. I have already discussed 

 this in my accouiat of Schizohlastits from Timor (1908, N. Jahrb. 

 f. Mineral., Beil.-Bd. xxv. p. 318). The affinities of Hypocrinus 

 also, as shown above, are closer to the Upper Carboniferous 

 '■'■ Lecijthioo'inus" adamsi, if not to the Devonian Gasterocomidae, 

 than they are to anything as yet known from undoubted Permian 

 rocks. It is of no avail to discuss the question further in this 

 place, for the abundant materials collected by Dr. J. Wanner 

 a,nd others will probably settle it when they have been described. 

 I would only suggest that the possibility of some of the fossils 

 being derived from older beds should be borne in mind. Some 

 of the feAv Echinoderms that I have studied had certainly been 

 much worn before they were included in their present matrix. 



Hypocrinus schneideri. (PI. XC. figs. 1-6 ; text-figs. 158, 159.) 



1862. Hypocrinus schneideri H. E. Beyrich. 



1865. Hypocrimis schneideri Beyr. ; H. E. Beyrich. 



1892. Hypocrinvs milleri [err. pro schneideri^ A. Rothpletz. 



For references, see " Previous Histoi-y." 



Diagnosis!. — This being the only undoubted species of Hypo- 

 crimis known to me, no specific diagnosis can be given. 



Holotype. — The original of Beyrich 's figures (1865) preserved 

 in Museum filr Naturkunde, Berlin (our PI. XC. figs. 1-4). 



The only other specimen described is that of Rothpletz (1892). 



Locality. — Both specimens come from Ajer Mati, S. of Kupang, 

 Southern Timor. 



Horizon. — Permian ? (^vide supra). 



Description of Holotype. — A dorsal cup, with no trace of stem, 

 anal plates, brachials, or tegmen. Surface of stereom stained 

 pinkish. Infilling matiix, soft micro-ciystalline calcite with 

 small dark specks. 



General shape squat, pyriform. Cross-section subpentagonal, 

 owing to projection of umbones of basals, which is especially 

 marked in the posterior basal. Height 20*8 mm. ; greatest 

 sagittal diameter 20-8 mm., greatest transverse diameter 

 19"9 mm., these being at about 14-5 mm. from basal plane. 



