Ijiitlsh Fossil Crinoith. 253 



therefore eliminate tlie monocyclic S. jacksoni. Of the two 

 flicy(;iic species I select S. anapeptamenus as the genotype j 

 and if reasons for this course be required^ there are tATOgood 

 ones : first, it was the species chosen for reconstruction, 

 so as to give Austin^s idea of the genus ; secondly, it 

 is the only one of which an authentic original specimen is 

 known, ^hich specimen I have above selected as the 

 holotype. 



Si/cocriiiiis therefore stands, with genotype S. cmapopta^ 

 menus ; and even if Austin's account was not perfectly 

 satisfactory, the essential characters of the genus are now,, 

 1 trust, quite intelligible. 



To this genus I also refer " Bypocrinus " pirifoi'mis 

 Rothpletz. 



To include the two species the generic diagnosis drawn up 

 to receive " H.' piriformis mav now be slightly modified 

 {cf. Proc. Zool. Soc. 1913, p. 912). 



Diagnosis of Sycocrinus. — A Taxocrinid with no radianal, 

 with huge liilJ forming a conspicuous part of the cnp, with 

 left post. R and arm enlarged and all others reduced in size, 

 with rectum passing out between BB and RR, being bounded 

 either by ])ost. B, 1. post. K, and r. post. R, or by those 

 plates ajid by r. post. B and r. ant. R in addition. 



Habits. — The asymmetry of Sycucrinus suggests that, like 

 many of the similarly asymmetric Engcniacrinidai, it was a 

 reef-dweller, fixed to a rocky shore by a short stem, and 

 exposed to a food-bearing current of some force flowing in 

 one direction. The cup, one snp])oses, was so placed that 

 the inner side of the large left })osterior arm faced the 

 current. The same current that brought the food-paiticles 

 would have swept away the fjecal stream as it issued from 

 the laterally projecting anal tube (PI. X. fig. 1 d). 



Geological Age. — The limestone at Settle, whence all the 

 Austins' specimens were obtained, is in the Dibunophylltivt 

 zone ; the precise horizon from which they were collected is 

 unknown. 



I cannot close this note without recurring to the question 

 of the age of the Timor pelmatozoa. I have previously 

 remarked on the Lower Carboniferous afHnities of Scliizo- 

 blastus (1908, N. Jahrb. f. Mineral., Beil. Bd. xxv. p. 318). 

 Sycocrinus now ap|;ears both in Timor and in our Lower 

 Carboniferous. And perhaps Dr. AVanner will allow me to 

 state that in my coeeval (.'ydotwcrinus he has recognized 

 another form found by him also in Timor. Even Hypo- 

 crinvs may be represented in Yorkshire by " Sycocrinus ' 



