748 SCIENTIFIC RECORD P^OR 1885. 



By W. H. Barris. (Presented before the DavcDport Academy of Sci- 

 ences, 1883.) Describes the new variety Megistocrinus nodosus, var. 

 multide-coratus and Dolatocrinus triadactyhis. 



(5) Stereocrinus Bairis. (Eevised.) By W. H. Barris. 



Wachsmuth, Charles, and Springer, Frank. — Revision of the Pa- 

 Iseocrinoidea. Part iii. Discussion of the Classification and Rela- 

 tions of the Brachiate Crinoids, and Conclusion of the Generic De- 

 scriptions. Proc. Acad. JSFat. Sei. Philad., vol. — , pp. 225-364, pis. 

 iv-ix. December, 1885. Philadelphia. 



An author's edition with a distinct pagination has also been pub- 

 lished. This contains only the first section of ^'part iii. The second 

 section, containing the Articulata and Inadmiata, has been referred by 

 the Philadelphia Academy to their Proceedings of 1886. The authors 

 give an elaborate discussion of the structure of the Palceocrinoidea, which 

 they divide into three groups. The name " Camarata^^ is proposed for 

 all Palceocrinoidea, in which the lower arm plates are incorporated into 

 the calyx by interradial plates, and in which all the component parts 

 of the test, dorsally and ventrally, are solidly connected by suture. 

 Under the name " Articulata^^ they include those families in which the 

 plates of the test are united by loose ligaments or muscles, and in which 

 they are somewhat movable. The name ^^ Inadunata^^ is proposed for 

 all Palceocrinoidea in which the arms are free above the first radials 

 and which have five single interradials located ventrally. The pre- 

 liminary discussion is subdivided under the following heads : 



(1) The plates of the abactinal system. A. The basals and uuderba- 

 sals. B. The radial and arm plates. C. The interradial, interaxillary, 

 and interbrachial plates. From the observations under this head the 

 authors draw the following conclusions, viz: (1) Interradials are rep- 

 resented in all groups of the Palceocrinoidea. They were developed in 

 the larva, attained at once large proportions, and persisted through life 

 or were resorbed on approaching maturity. (2) They extend invari- 

 ably to the proximals, or even cover them completely. (3) They are 

 more extravagantly developed in the earlier groups, not always in num- 

 ber, but by extending over comparatively larger space. (4) In all 

 groups in which the arms are free from the first radials they are repre- 

 sented by only five single plates, and these are located ventrally. 

 Groups with two or more radials have two at least, and the number 

 increases in proportion to the increase of the radials, by means of which 

 the lower series attain gradually a dorsal position. D. The anal 

 plates and anal tube. 



(2) The plates of the actinal system. A. The summit plates. The 

 authors think that the orals, if these are developed in Palceocrinoidea^ 

 which they think is the case, can only be represented by the central 

 plate. A resorption of the summit plates may have taken place in the 



