Mr. A. G. Butler on the Genus Cleis. 393 



crust ; c c, central cylinder (compressed or oval form) ; d, frac- 

 tured anterior extremity of tlie same ; e, posterior extremity or 

 tail more or less covered by the tuberculous layer ; /, eminences 

 of the tuberculous layer of a conical form attached to the central 

 cylinder, ? annelid-like ; ff, central longitudinal depression simu- 

 lating dorsal vessel ; h, commencement of a ? gemmiparous 

 branch. 



Fig. 3. The same : fragment of a central cylinder, broken (compressed 

 form) to show its ? segmented appearance, &c. a a, remains of 

 concretionary crust; bb, mould of tuberculous layer therein j 

 cc, portions of tuberculous layer adherent to the cylinder; 

 dd, central cylinder, showing the segmented appearance; e, 

 central longitudinal depression simulating position of dorsal 

 vessel; //, lateral linear depressions simulating positions re- 

 spectively of lateral vessels or segmental grooves ; ff, line of 

 fi-acture ; h, portion whose other- side is represented in lig. 6. 



Fig. 4. The same : branched form, a a a a, concretionary crust ; hhbb, 

 casts and moulds respectively of tuberculous layer; cc, ? parent 

 circular cylinder; dcldd, branches truncated respectively; e, 

 ? gemmiparous projection or commencement of new branch on 

 circular cylinder ; /, form of the cells of that portion of the con- 

 cretionary crust taken off g, where these cells (=:motdd of the 

 tuberculous layer) are most regularly formed ; h h, compressed 

 cylinder. 



This specimen looks as if the circular branched cylinder (c c) 

 •were in contact with the co?iipressed form (h h). all of which was 

 enclosed within one and the same tuberculous layer, which was 

 prolonged sheath-like upon the branches respectively. 



Fig. 5, The same : central cylinder (circular form) divested of the tuber- 

 culous layer to show the transverse reticular lineation. a, form 

 of depi-essed reticular lineation with slightly raised or convex 

 interstices (scale-like ) where most regular. 



Fig. 6. The same : the other side of that portion of fig. 3 marked " /;," 

 to show the form of the tuberculous layer when divested of the 

 concretionary crust and still adherent to the central cylinder, 

 a, central cylinder (compressed form) ; 6 b, tuberculous layer ; 

 c c, situation- of sponge-spicules. 



Fig. 7. The same : transverse section of a central cylinder (circular 

 form), and its tuberculous layer divested of the concretionary 

 crust, showing the relative position of the two former, a, cen- 

 tral cylinder ; b, tuberculous crust. Diagram. 



Fig. 8. The same : transverse section of a central cylinder (compressed 

 form), to show the same, a, central cylinder ; b b, tuberculous 

 layer ; c c, incrustation of sponge-spicules &c. 



XXXVIII. — Revision of the Lepidopterous Genus Cleis, loith 

 Descriptions of the new Species. By Akthue G. Butler, 

 F.L.S. &c. 



The genus Cleis is nearly allied to Callidula, Tyndaris^ and 

 Cleosiris. These four genera appear to me to be an aberrant 

 group of the family Hypsidte, and should be placed between 

 the true Hypsidas and the Melameridte. 



