412 =Mr. F. P. Pascoe on Australian Curculionide. 
us nearer to the solution of certain general questions with 
regard to these interesting organisms. ‘The greatest import- 
ance attaches to remarks appended to the specimens sent as 
to the time when the sponge was found, and the most exact 
possible statements (they can hardly be exact enough) as to 
the conditions of the locality, movement of the water, nature 
of the ground, amount of lime and salt (if any) —~every thing is 
necessary to be known, for we cannot at all foresee what fac- 
tors are of real importance in arriving at a conclusion. 
EXPLANATION OF PLATE XV, 
Potamolepis Leubnitzia, n, sp. 
Fig. 1. Beautifully preserved specimen upon a slab of stone, nat. size. 
At x acolony of cases of larvee (of Diptera ?). 
Fig. 2, Three oral cones, X 4. 
Fig. 3. Rubbed specimen, showing partially the course of the gastro- 
vascular system. X $. 
Fig. 4. Gastric space with ramifications, from the same specimen. X 4. 
Fig. 5. Skeletal elements in their natural position. x 30, 
Fig. 6. Two isolated spicules. x 100. 
Potamolepis chartaria, 1. sp. 
Fig, 7, Three oral cones. 
Fig. 8. Skeletal elements; below are five spicules of the true skeleton, 
which are covered by a felted web of very fine uniaxial spicules. 
x 30. 
Fig. 9. Four isolated uniaxials of the dermal skeleton. x 120. 
Potamolepis Pechuélit, v. sp. 
Fig. 10. Perfect specimen. a, oldest part. 
Fig. 11. Two spicules. 
XLVIII.—Additions to the Australian Curculionide.— 
Part X. By Francis P. Pascoe. 
BRACHYDERINZE. GONIPTERIN 2, 
oO . o ee 
Styreus, D. g. Minia, n. ¢. 
—— geonomoides. — opalescens 
LEPTOPINZE, 
Leptops punctigera. HYPERIN@. 
incompta. 
—— vermicosa. Propheesia florea, 
