372 DR F. A. BATHER. 



tlien to the diagnosis of Dendrocystis must be added the statement that the stem is 

 devoid of appendages. 



§ 41. Genotype. — Dendrocystis Sedgwicki Barr. As will be shown in the sequel, 

 the specimens on which Barrande based his description of this species belong to two 

 species, one coming from his horizon d4 at Zahorzan and d3 at Trubin, the other from 

 d2 at Trubsko. There is nothing in the description of 1887 to connect the name with 

 one of these species rather than with the other. The name, however, was first intro- 

 duced as a nomen nudum in the form Cystidea Sedgwicki (1867), and the species was 

 then only said to occur in d4. That therefore must be regarded as the type-horizon, 

 and this carries with it the consequence that the name D. Sedgtvicki must be applied 

 to the species found at Zahorzan and Trubin. (See further §§ 92, 111.) 



§ 42. Other Species. — That from d2 at Trubsko is described below under the new 

 name Dendrocystis Barrandei (§89). 



Dendrocystis rossica Jaekel (1901) comes from the Brandschiefer of Esthland, which 

 are in the Kuckers beds, C2 of F. Schmidt (§ 150). 



The specimens collected by Mrs Gray from the Starfish Bed of Thraive Glen belong 

 to a single new species, Dendrocystis scotica (§ 127). 



The stem found in the Trenton Limestone near Quebec, which Billings described 

 as Syringocrinus paradoxicus, very probably belongs to this genus (§ 155). If this 

 could definitely be proved, the consequence, in accordance with Article 27a of the 

 "International Rules of Zoological Nomenclature" (1905), would be that the well- 

 known and universally used name Dendrocystis would have to yield to Syringocrinus, 

 a name applied to a fragment either ignored or misinterpreted by all other writers. 

 To avoid this absurdity, I purposely refrain from writing Dendrocystis 'paradoxica 

 without a note of interrogation. 



§ 43. The following is the stratigraphical order of the described species : — 



Upper Caradocian. D. scotica. 



Lower Caradocian. 



D. Sedgwicki. 



Upper Llandeilian. D. ? paradoxica. 



D. rossica. 



Lower Llandeilian, 



Upper Arenigian. 



D. Barrandei. 



[I have just found another species in the Tremadocian of Herault, Colin. J. Miquel. 

 June 1913.] 



§ 44. Description of the Genus. — This is based on a fresh study of actual material 

 belonging to all four species, as given in detail under the head of each species. Since, 

 however, the available material of D, rossica is restricted to columnals, statements 



