1164 LARViE AND LARVA-CASES OF AUSTRALIAN APHROPHORIDiE, 



EXPLANATION OF PLATE LXVIII. 



Fig. 1. — Diagram of the plates of Tribrachyoerinus corrugatus, including 

 the second radials articulated with the first radials. 



Fig. 2. — Upper side view of the outer part of the Calyx, from a plaster 

 cast obtained from the sandstone hollow cast (negative). The 

 three second radials and a part of the small plates of the vault 

 are seen. 



Fig. 3. — Upper side view of the inner cast (sandstone) of the Calyx 

 showing the negative casts of the three second radials and of a 

 part of the small plates of the vault. Taken in the same 

 position as fig. 2. 



Fig. 4. — Under side view of the outer part of the Calyx, from a plaster 

 cast as in fig. 2. Showing the three basal plates and the sub- 

 radial B on the right of the fig. 



Fig. 5. — Under side view of the inner cast of the Calyx, taken in the same 

 position as fig. 4. 



Fig. 6. — View of the symmetrical radial, showing the granulations of the 

 surface. Double size. 



Fig. 7. — Under side of the second radial showing muscular striae. Double 

 size. 



Fig. 8. — Upper side of the same showing socket for the first article of the 

 arm. Double size. 



Fig. 9. — Side view of the same. Double size. 



Fig. 10. — Medial section of figs. 6 and 7, arranged so as to show the place 

 of the muscle and their relative position. Double size. 



Fig. 11. — Section pq. of second radial. Double size. 



Fig. 12. — Section rs. of same. 



ON THE LARViE AND LARVA-CASES OF SOME 



AUSTRALIAN APHROPHORIDiE. 



By F. Ratte, Eng. Arts and Manuf., Paris. 



(Plates LXIX. and LXX.) 

 There are several instances of insect larvae building a kind of 

 shell, if not shell in structure, at least in form. In Helicojisyclie, 

 a phryganid (Trichoptera), the larva of which lives in the 

 waters of warm countries, the shell is in the shape of an Helix, 

 and is formed of agglutinated sand. This shell often includes 

 bright minerals, such as quartz, garnets, amphibole, mica (New 

 Caledonia.) In a classical instance, it is formed of small 

 Planorlis (Westwood). In this country the female of a case-moth 

 lives in a perfectly helicoidal shell apparently formed by aggluti- 

 nated vegetable matter. 



