Prof. J. Miiller on the Structure of the Echinoderms. 255 



plate support a great number (? 15 or 16) of verj' delicate rays. 

 None of the English writers mention any reticulated connexion 

 of the rays ; I must therefore leave it unsettled, whether this 

 English Crinoid stands in any relation, either close or distant, 

 with our present subject. 



Under these circumstances it will be necessary to found a 

 peculiar genus for the Crinoid from Gothland with reticulated 

 arms, for which I propose the name of Anthocrinus — species An- 

 thocrinus Loveni, Miiil. It is obvious that these Crinoids with 

 reticulated arms stand alone and constitute a peculiar small sec- 

 tion, of which at the present time only one form, fi'om the Silu- 

 rian formation of Gothland, is known. I shall hereafter, when I 

 am more fully acquainted with the Crinoids of this formation, be 

 able to speak of its relations with the other Crinoids of the 

 transition limestone. 



The continuation of this memoir is concerned with the Halo- 

 thuriadcB, and reports of its contents have been already given. The 

 numerous figures appertaining to the memoir are reserved for 

 the Transactions of the Academy. In conclusion, I offer my 

 hearty thanks to the friends who have so generously assisted my 

 labours. 



Supplementary Notice. 



It should be added to the remarks upon the interambulacral 

 plates of the Asterida, that in Astropecten the difi'erent series of 

 interambulacral plates are simultaneously applied to the ambu- 

 lacral plates ; the outer being the lateral plates of the grooves, 

 the inner only \isible in the abdominal cavity uniting the ambu- 

 lacral plates with the inferior marginal plates. The intermediate 

 plates between the lateral and marginal plates have already been 

 referred to. 



Note by the Translator. 



Without wishing in the slightest degree to detract from the 

 originality of the views with regard to the homologies of the Cri- 

 noid skeleton expressed by Prof. Miiller in the preceding pages, 

 we nevertheless feel bound, in justice to our distinguished coun- 

 trjman Prof. E. Forbes, to state that he has long taught in his 

 public lectures an essentially similar doctrine, viz. that the 

 'head' of a Crinoid may be compared to an Echinid placed 

 mouth upwards, and having its vent brought into proximity with 

 the mouth (as in Echinocyamus) : that the arms are freed ambu- 

 lacra ; that the cup or ' pelvis ' is formed, partly by the oculars, 

 partly, in many genera, by accessory plates (like those in the disc 

 of Salenia), and partly by the interambulacral plates, — the genital 



