.— 77 — 



posterior extremity, running from the junction of the posterior wing above to the point 

 of the fang; anterior to this the fang is grooved parallel to the anterior edge; while po- 

 sterior to it the grooves take the direction of the anterior edge of the wing, and becorne 

 gradually more and more recurved towards the points, and are continued on the ridge. 

 The posterior dorsal wing is very small and lunate, not rising above the beaks, gently 

 arched, scarcely projecting beyond the posterior margin of the fang; its lower margin 

 would correspond with the lower margin of the anterior area if continued; the superior 

 margin is rough and strong, förmig a broad area defined by a sharp-crested ridge, and 

 emarginated at the junction of the wing. Hinge-tubercles large, with a hook-shaped pro- 

 cess from each, by which the valves are interlocked ; the wing is formed by a sharp shell- 

 like ridge, and is smooth and slightly excavated. The cavity of the beak is filled with 

 a spongy calcareous matter, from which issues the delicate and flattened subumbonal pro- 

 cess, which presents its flat side to the valve, and at about one-third of its length forma 

 a decided elbow backwards. 



Length from before backwards 5 / 8 inch, from above downwards a little less. 



Palettes very large and long, stilt-shaped; the style long and subulate, slightly 

 flexuous, bony, surrounded by a broad dilatation or step; concave on one side, convex 

 on the other, its upper surface deeply excavated; on this is placed the blade, which is 

 three-fourths as long as the style, thin, linear, obliquely truncated at the tips, about one- 

 third the width of the slit. 



Length of style 7 / 10 , of blade 4 / 10 inch. 



The animal is 10 inches long; the siphonal tubes are of nearly equal diameter, and 

 are united nearly to their tips, they reach to a little beyond the dilated portions of the 

 palettes. 



Patria : Singapore. 



Bemerkung. Ich kenne die Art nur nach der copirten vorstehenden Beschreibung 

 und Abbildung Wright's. 



Nr. 24. Teredo australis Wright. 

 Taf. 20. Fig. 1-3. 



Calobates australis Wright Trans. Nat. hist. Linnean Soc. XXV p. 564 



t. 64 f. 1—5. 



Bemerkung. Wright kennt von dieser Art nur die Sipbonalröhren und die Palette. 

 Das Schälchen ist ihm nicht bekannt geworden. Die Beschreibung der bekannten Theile 

 lautet wie folgt: 



