430 Mr, A, Adams on the Animal and Affinities of Scaliola. 



descended, and remained helpless at the bottom of the vessel : 

 the floats were not regenerated or renewed during the period 

 the animals remained alive. Crepitating portions, when sepa- 

 rated, continue buoyant until the vesicles of which they are 

 composed gradually collapse from the escape of the air with 

 which they are distended ; and the floats, when pounded in a 

 mortar, are readily reduced to a mucus. 



XLVI. — On the Animal and Affinities of Scaliola, a Genus of 

 Mollusca from Japan. By Arthur Adams, F.L.S. &c. 



In the ' Annals^ for 1860 (vol. vi. p. 120), I gave, under the name 

 of Scaliola, a short description of what I then believed to be a 

 new subgenus of Scala. Since then, however, I have discovered 

 the Mollusk in a living state, and have ascertained, from an 

 examination of the animal, that it is furnished with a rostri- 

 form head, as in Rissoidse, and not with a retractile proboscis as 

 in Scalidse. In all the species I have met with in Japan, its 

 curious habit of agglutinating grains of sand to the surface of 

 the shell is observable. In this peculiarity the genus resembles 

 Onustus and Xenophora ; a species of Helicina likewise exhibits 

 the same remarkable feature. In the original specimens from 

 which I took my first description the foreign particles were 

 worn off. 



Genus Scaliola, A. Adams. 



An. capita proboscidiformi. Rostrum elongatum, cylindricum, 

 annulatum. Tentacula filiformia. Oculi prominentes, nigri, ad 

 basin externam tentaculorum positi. Pes brevis, ovatus, postice 

 subacuminatus. 



Operculum corneum, ovatum, subspirale ; nucleo subterminali. 



Testa turrita, umbilieata seu rimata; anfractibus agglutinantibus, 

 arenaceis. Apertura plus minusve circularis, peritremate continuo ; 

 margine recto, acuto. 



The species the animal of which I observed was S. bella, A. Ad. 

 It occurred in considerable numbers at Takano-Sima, a small 

 island near Tatiyama, on the coast of Niphon, in from two to 

 three fathoms, on a bottom of sandy mud. The rostrum is long, 

 large, annulate, bifid at the end, and of a pale yellow colour. 

 The tentacles are small and filiform, with large black eyes at 

 their outer bases. The head is elongated, with a dark median 

 linear mark on the upper surface. The foot is short, ovate, 

 semipellucid, with an opake white blotch on the side near the 

 operculum. 



1, Scaliola bella, A. Adams. 



S. testa pyramidato-turrita, late umbilieata, alba ; anfractibus arenaceis. 



