8 Ech. 
ECHINODERMATA. 
CRINOIDEA. 
Carpenter (6) describes Thaumatocrinus renovatus , g. & sp. nn., from 
1800 fath. depth. It is remarkable for: — (1) The presence of a closed 
ring of basals on the exterior of the calyx. (2) The persistence of the oral 
plates of the larva, as in Hyocrinus and Rhizocrinus. (3) The separation 
of the primary radials by interradials which rest on the basals. (4) The 
presence of an arm-like appendage on the interradial plate of the anal 
side. The deep significance of these characters is clearly pointed out. 
Perrier (18) describes Democrinus parfaiti , g. & sp. nn., but Carpenter 
(8) thinks it is the same as Rhizocrinus rawsoni. 
Eudiocrinus atlanticus , sp. n., Perrier (19). 
On Apiocrinus , cf. De Loriol, CR. Ass. Fr. Sci. 1882, pp. 334-338. 
Arthroacantha ithacensis, g. & sp. nn. A Devonian Crinoid with move- 
able spines. H. S. Williams, P. Am. Phil. Soc. xxi. pp. 81- 83, 1 pi. 
Adult of Eucrinus gracilis ; Kunisch, Z. geol. Ges. 1883, pp. 195-198, 
pi. viii. 
Euci'inus beyrichi , sp. n., Picard, tom. cit. pp. 199-202, pi. ix. 
. Remarks on Glyptocrinus and Reteocrinus , two geuera of Silurian 
Crinoids; Am. J. Sci. xxv. pp. 255-268. 
Glyptocrinus redefined and restricted, Gaurocrinus , Pycnocrinus , and 
Campsocrinus established, and two new species described ; S. A. Miller, 
J; Cincinn. Soc. vii. pp. 217-234. 
Palceocrinoulea of Illinois ; Worthen & Miller, Geol. Surv. Illin. vi. 
pp. 269-317. 
Echinodiscus, g. n. of Agelacrinoidea [name preoccupied] ; rid. 1. c. 
p. 335. 
Etheridge & Carpenter make some further remarks on the morphology 
of the Blastoidea ; Ann. N. H. (5) x. pp. 225-246. 
On the characters of the Blastoidea , and observations on the structure 
of the basal plates in Codaster and Pentremites ; Worthen, Geol. Surv. 
Illin. vii. pp. 346-357. 
