158 



differently from the pleural tracts and extending in front of 

 tliem between the sutural laminae; lateral areas not diffe- 

 rentiated; valves heavy, strongly sculptured. One Species: 

 Lepidopleurus percrassus Dall. 

 Sectiou Püshryella Nierstr, 



Valves large. Girdle with spicules and hairs ; also hairs 

 between the valves. One species : Lepidopleurus setiger Nierstr. 

 Now we must see to which section our new form belongs. No 

 doubt, it is neither a Lepidopleurus s. str., nor does it belong to 

 Oldroydia ou account of the complete absence of scales, nor to 

 Püshryella on account of the complete absence of hairs. Only a 

 comparison with Deshayesiella is possible, because the girdle of 

 Lepidopleurus curvatus Carp. also has spines; occasionally how- 

 ever also chafify scales occur. (H. A. Pilsbry, Man. of Conchol., 

 Vol. 14, Pag. 14—16). There is indeed an affinity with this 

 form. In Pilsbry's Manual of Conchology (Vol. 14, Pag. 16) 

 we find Carpenter's descriptiou of Lepidopleurus curvatus. The 

 central areas show longitudinal beaded lines, 8 to 10 on each 

 side; the lateral areas are coarsely, irregularly granose. The 

 sculpture of the valves of Lepidopleurus africanus however is 

 finer. The girdle of curvatus is covered with many spines, while 

 the girdle of africanus has only few. Lepidopleurus curvatus is 

 fouud at Okosiri, Japan. 



Except this form there are only two species of Lepidopleurus 

 known from the Mediterranean, viz. Lepidopleurus cajetanus Poli 

 and Lepidopleurus algesiriensis Carp. (= Lepidopleurus granolira- 

 tus Carp.). 



III. Chitoii (Radsiji) cliierclilae, nov. spec, (Fig. 15 — 18, 

 21-28, 30, 31, and goodalli Brod. (Fig. 19, 20, 29, 31). 



In the Collection of the Zoological Museum at Utrecht I found 

 a large Chiton, which I believe to belong to a new species. This 

 animal was found by the Chierchia-Expedition at the Galapagos- 

 Islands together with a fine specimen of Chiton [Radsia) goodalli 



