214 M. E. Claparéde on a new Genus 
6. Oliva pulchra, Marrat. 
Shell fusiform, rather narrow; spire conical, whorls slightly 
flattened; suture canaliculate; pale cream-coloured, with 
brown festoons below the suture ; body-whorl with irregular 
brown longitudinal flames, spotted above the white basal 
band; columella slightly granular, with a single fold at the 
base. 
Among some shells from California; but the locality is 
doubtful. A small shell, not larger than O. oryza, Lam. 
XXIII.—On a new Genus of Gastrotrichous Rotatoria. 
By E. CLAPAREDE*? 
THE genera Chetonotus, Ehrb., and Ichthydium, Ehrb., have 
hitherto occupied only an uncertain place in the zoological 
system. M. Ehrenberg joined them to Ptygura and Gleno- 
phora to form a family of Rotatoria; Dujardin considered 
them to belong to the Infusoria; M. Vogt classes them in a 
general way among the Vermes; M. Schmarda makes them 
almost Annelides; M. Ehlers even approximates them to the 
Nematoida. The opinion most generally accredited is that 
which regards them as Turbellaria. M. Max Schultze was 
the first to develope this opinion when he made known, under 
the name of Turbanellat, a new genus belonging to the same 
group. The two authors who have most carefully studied 
these interesting animals of late are Mr. Gosse} and M. Mecz- 
nikow §. 
The former, in making known several new species, avoids 
pronouncing an opinion on the natural position to be assigned 
to the family Cheetonotides (Hairy-backed animalcules, as he 
calls them). It was, indeed, very difficult for him to form a 
judgment, on account of the unfortunate union with this family 
of two dissimilar genera, namely, Taphrocampa, Gosse, and 
Echinoderes, Duj. Now the Taphrocampe are, as | have 
already demonstrated, true Rotatoria. As to Hchinoderes, it 
has no affinities with either the Rotatoria or the Turbellaria. 
The mistake of Mr. Gosse with regard to them is easily ex- 
* Translated from the ‘Annales des Sciences Naturelles,’ 5* sér. tome 
vill. pp. 16-28. 
+ Beitriige zur Naturgeschichte der Turbellarien, von Dr. Max Sigis- 
mond Schultze, (Greifswald) p. 69. 
{ “The Natural History of the Hairy-backed Animalcules” (Intellec- 
tual Observer, 1864, pp. 807-406). 
§ “Ueber Chetonotus und Icthydium, und eine neue verwandte Gat- 
tung Turbanella,” Miller’s Archiv, 1853, p. 241. 
