The siphonal tubes are united to their very tips, and extend, in the spirit speci- 

 mens, just above the expanded portion of the palettes. The larger tube has a double 

 row of fringe-like tentacles, the smalles a single row, with the tentacles fewer in number. 

 The palettes ar situated right and left of the siphons, and, with them, are enclosed in a 

 deep border of the mantle, which forms an almost circular fringe round the base of both[; 

 this border splits in two at the back of the smaller siphonal tube, its margin is stightly 

 puckered, and the integument covering it is rugose. The style of the palettes is about 

 3 / i inch long, strong, very sharp-pointed, and connected to the body by four very distinct 

 muscles, which Surround it; these muscles are themselves just covered by the fringe of 

 the mantle. The style next expands into a broad dilatation which is very slightly con- 

 cave on its inner surface and convex on its outer: its upper surface is deeply excavated; 

 and from this proceeds a blade-like appendage about 1 / 2 inch long; this is directed obli- 

 quely, and is tuberculated on its external surface. 



Vaterland : Westaustralien. 



Nr. 25. Teredo japonica m. 



Taf. 20. Fig. 9. 10. 



Teredo sp. Berlin. Mus. 



T. parvula, globosa, tenui; antice valde hiante, postice clausa; parte sup. leviter 

 striata; parte infer. glabra; palmulis angustis bifurcatis. 



Schälchen klein, dünnschalig, rundlich, vorne sehr weit klaffend; Hintertheil 

 geschlossen; die obere Wirbelpartie fein gestreift, der untere Theil glatt, unter 

 dem Wirbel eine gebogene Leiste, an der eine sichelförmige, ziemlich lange, feine 

 Apophyse angebracht ist; Palette schmal, kurz gestielt, oben in vortretende Spitzen 

 endigend. 



Lg. 3.5 mm., Länge der Palette 4 mm. 

 Vaterland: Japan. 



Nr. 26. Teredo clava Gmelin. 

 Taf. 20. Fig. 4-8. 



Fistulana gregata Lamarck. 

 Teredo clava Gmelin. 

 Uperotis clava Wright. 



