103 
of basals, 'without j^rojectiug above their ventral margin. In Graph iocrlnus, 
on the contrary, the anal plate rests on the upper angles of two raclials, or, 
according to De Koninck’s figures,^ it is placed between two rays, wedged 
between tAVO radials and two costals. It is to he regretted that the utility of 
Messrs. Wachsmutli and Springer’s grand work is sometimes marred by a 
contradictoriness of statement, which renders their actual vicAVS difficult of 
comprehension. In the revised generic diagnosis of Graphiocrinus given by 
them, they assign to the anal a someAvhat analagous position — “either resting 
on the posterior basal or separated from it, but in citlier case extending 
aboA^e the plane of the radials.” On the other hand, in a sulAsequent note on 
the genus,“ they say, as quoted by Dr. P. II. Carpenter, that the anal is 
“ small, and placed between the radials, resting on the truncated upper 
side of the posterior basal.” I prefer, liOAveA'’er, to accept their first definition, 
AAdiich practically causes Grapliiocrmus, vobis, to differ from Fhialocrinus as 
much as Graphiocrinus, Dc Koninck, does. 
The separation of Bursacrinus from Bhialocrinus has already been 
referred to by Dr. Carpenter. 
Cromyocrimis, Trautschold, is another genus to which our Australian 
species of Bhialocrinus bear a strong general resemblance. In the Avords of 
Messrs. Wachsmutli and Springer, Avhen discussing the relations of the two 
first-named genera,^ — “ The species of both agree in the bowl-shaped, some- 
times nearly globular form of the calyx, its comparatively very large size, its 
large and heavy plates, the massiA^e and simple arms, and the exceedingly 
slender column ” — but the structure of the anal side quite separates them from 
Cromyocriniis. The anals are three in number, the loAvcr being the largest, 
and rests obliquely between the posterior basal and right radial. The second 
anal is placed betAveen the first anal and left radial, and aboA^e the basal, 
whilst the third is much SAVollen, and only the lower half of it is included in 
the calyx. 
Dr. Carpenter referred to the fact that JEsiocrinus, S. A. Miller, does 
not differ from Bhialocrinus. ]\Iessrs. Miller and Gurley say of the latter 
that the calyx is boAvl-shaped, Avith fiA"e infra basals (their basals), thcbasals 
(their sub-radials) large, four hexagonal and one heptagonal, the radials 
pentagonal, AA'ider than high, and truncated their entire AAodth, azygous j)late 
* Recli. Ci'inoidos Terr. Carh. Belgique, 1853, p. 115. 
^ Revision of the Palasocrinoidea, 1886, Ft. Ill, No. 2, p. 252 (176). 
» Ibid., 1879, Ft. I, p. 133. 
11« 64—92 
a 
