﻿204 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



Phylum ECHINODERMA Bather 

 Grade PELMATOZOA Leuckart 



Class CARPOIDEA Jaekel 

 Jaekel 1 defines this class as follows : 



"Carpoidea are aberrant, irregular Pelmatozoa, whose ambulacral 

 organs had but slight connection with the thecal skeleton and on 

 which it generally left but slight traces of its existence. Their thecse 

 form a closed capsule whose wall has a mouth and anus. The thecal 

 skeleton is always apentamer, often distorted, mostly oriented dorso- 

 ventrally, and more or less symmetrical on the right and left. The 

 ambulacra are developed in two radii. The known bearers of the 

 ambulacral grooves are arranged in a single line. The base has four 

 or three pieces, the stem consists mostly of two series of symmetric 

 parts, and sometimes has metamerally ordered genital appendages. 

 Their geological distribution is in the Cambrian and Silurian." 



The range should extend from the Cambrian into the Lower 

 Devonic, as Anomalocystites ( ?) disparilis Hall is found in the Upper 

 Oriskany formation. 



Family Anomalocystid,e Meek 

 This family is defined by Jaekel in the work just cited (p. 668), 

 as follows : " Theca oval, nearly symmetrical, and both broad sides 

 having similar skeletal plates. Ventralia only about twice as numer- 

 ous as the dorsalia. Three to four marginalia on each side with 

 angulated side margins. Base deeply impressed; the stem occupies 

 the entire breadth of the basalia. Thecal plates ornamented with 

 horizontal wavy lines." In Anomalocystites there are 2 stout and 

 short arms composed of imbricating plates in 2 columns, having great 

 ambulacral furrows covered by minute roofing plates. In Placocys- 

 tites and seemingly, also, in Anomalocystites (?) disparilis the arms 

 are replaced by long and slender, apparently non-segmented spines. 



Anomalocystites Hall 



Anomalocystites Hall, Amcr. Jour. Sci. (2), xxv, 1858, p. 279. — Hall, 

 Nat. Hist. N. Y., Pal., 111, 1859 [1861], p. 132. — Meek (partim), 

 Gcol. Surv. Ohio, Pal., 1, 1873, p. 43.— Barrande (partim), Syst. Sil. 

 du Centre de la Boheme, vil, pt. 1, 1887, p. 89. 



Ateleocystites Woodward (partim), Geol. Mag., dec. 11, vn, 1880, pp. 193, 

 194. 



Anomocystis Haeckel, Die Amphorideen und Cystoideen, Beitr. Morph. 

 u. Phyl. d. Echinodermen, Leipzig, 1896, p. 40. 



Anomalocystis Bather, Treatise on Zoology, pt. in, Echinoderma, Lon- 

 don, 1900, p. 51. 



1 '/.cits. Deutsch. gcol. Gcscllsch., 1900, p. 662. 



