350 PROCEEDINGS OF THE ACADEMY OF [1885. 



There is some doubt whether Hypanthocrinus Phillips is a 

 synonym of Eucalyptocrinus or a good genus. Hypanthocrinus 

 was separated by Phillips simply upon the presence of a column, 

 which Goklfnss thought to be absent in Exicalyptocrinus, but as 

 E. rosaceus, his type is known to be pedunculated, this distinc- 

 tion fails. Angelin and Zittel, who both uphold Hypanthocrinus, 

 describe the base as being less deeply funnel-shaped, the anal 

 tube as extending beyond the arms, and the partition walls sur- 

 rounding the arms as being constructed principally of a single 

 piece. A critical comparison has convinced us that these charac- 

 ters are not constant throughout the species. The'onby character 

 upon which a separation might possibly be effected, is the pro- 

 boscis-like anal tube, but this part, unfortunately, is rarely pre- 

 served. Some of the American species with a long tube have a 

 deep, funnel-shaped base, while in others with a simple opening, 

 the base is comparatively shallow. In all of them the partition 

 walls between the arms consist of two pieces, but in some species 

 the lower one is comparatively longer than in others. We shall 

 ignore Hypanthocrinus until better distinctions are given. 



Eucalyptocrinus is closely allied to Callicrinus, from which it 

 differs in having rudimentary partitions between the arms, ex- 

 tending out only a short distance, leaving the greater part of the 

 arms free and unprotected. 



A mong the species that have been referred to Eucalyptocrinus, 

 are several which were described from natural casts. We do not 

 deny that their generic relations were correctly identified, nor 

 that differences of specific value probably exist among them, but 

 we doubt if it is possible for any one to decide from internal 

 casts whether such specimens are specificall} r distinct from others 

 in which the test is preserved, and hence consider them for the 

 present as doubtful species. 



Troost's Eucalyptocrinus conicus, E. extensus, E. gibbosus, E. 

 Goldfussi, E. Itevis, E. Nashvillse, E. Phillipsii and E. Tennes- 

 see, all from the Niagara of Western Tennessee, are mere cata- 

 logue names, no descriptions having been published. 



Generic Diagnosis. — When the arms are attached more or less 

 ovoid ; without arms resembling a wine bottle with concave bot- 

 tom and long slender neck. The neck is surrounded by ten par- 

 titions, arranged vertically so as to form ten niches or compart- 

 ments for the reception of the arms. The calyx is composed of 



