620 
ZOOLOGICAL LITERATURE. 
ECHINODERMATA 
BY 
J. Reay Greene, B.A. 
Agassiz, A. On the Embryology of Echinoderms. Mem. Amer. 
Acad. vol. ix. 1864 (pp. 30, with four plates). 
Gray, J. E. Notice of a portion of a new form of animal 
(Myriosteon Higginsii) , probably indicating a new group of 
Echinodermata. Proc. Zool. Soc. 1864, April 12 (pp. 163- 
166, with woodcuts). 
Grube, a. E. Die Insel Lussin und ihre Meeresfauna. Breslau, 
1864, 8vo (pp. 98-106). 
Jeffreys, J. G. Remarks on Stilifer, a genus of quasiparasitic 
Mollusks ; with particulars of the European species S. 
turtoni. Ann. & Mag. Nat. Hist. vol. xiv. ser. 3, 1864, 
November (pp. 321-334). 
Wright, T. A monograph on the British Fossil Echinodermata 
from the cretaceous formations. Vol. i. Tart 1 (pp. 64, and 
11 plates). London, 1864. (Issued by the Palaeontogra- 
phical Society for 1862.) 
Wright (pp. 15-18) defines the class Echinodermata and its 
orders, of which he admits eight. But his definitions want 
scientific accuracy and completeness, and are not such as might 
have been expected from an accomplished palaeontologist, writing- 
in 1864. He still retains, as an order of this class, ^ipuncu- 
loideoj which, as every anatomist knows, possess none of the 
positive zoological characters by which the true Echinodermata 
are distinguished. * 
Grube enumerates thirty species of Echinoderms found by 
him around Lossini. None of these are new. 
Here reference may be made to the resume which Jeffreys 
has given of the literature of the genus 8tilifer, with a complete 
list of its species, and a description, from his own observations, 
of the external characters and habits of S. turtoni. These mol- 
lusks are found on the integument of Echini and starfishes from 
various parts of the globe. One species, S. acicula{=Eulima 
vitrea, A. Adams), is eaten by Holothurice. Jeffreys does not 
regard Stili/er as a true parasite, nor yet again as an cpizoic 
