55 



1. Familia. Asconidae. Homocoela with simple gastral cavitj-, 

 8 species. 



2. Familia. Homodermidae. Homocoela with Radial tubes, 1 spe- 

 cies (connected with Asconidae by Ascaltis canariensis and La- 

 marckii). Transition form between Asconidae and Syconidae. 



3. Familia. Leucopsidae. Homocoela with a highly developed Me- 

 soderm, in which the sac-shaped stomachs of the colonial indi- 

 viduals are imbedded. 1 species. Possibly a transition form 

 between Asconidae and Leuconidae. 



n. Subordo. Heterocoela. Calcispongiae, the Entoderm of which is 

 differentiated into pavement- and flagellate cells. 



4. Familia. Syconidae. Heterocoela with sac-shaped radially dis- 

 posed ciliated chambers, opening directly into the gastral cavity. 



I. Subfamilia. Syconinae. Syconidae with terminally free, simple, 



ciliated tubes. 7 species. 

 IL Subfamilia. Uteinae. Syconidae with simple ciliated tubes joined 



terminally by a cortex. 6 species. 

 III. Subfamilia. Grantinae. Syconidae with ramified ciliated tubes. 



3 species. 



5. Familia. Sylleibidae. Heterocoela with sac -shaped ciliated 

 chambers, which are connected with the gastral cavity by a 

 system of exhalant canals. 



I. Subfamilia. Vosmaerinae. Sylleibidae, the ciliated chambers of 

 which form a simple cylindrical layer [LeucettaVol.) 3 species. 



IL Subfamilia. Poleinae. Sylleibidae, the ciliated chambers of 

 which lie in a folded plane. [Leucilla Pol.) 1 species. 



6. Familia. Leuconidae. Heterocoela with spherical, ciliated cham- 

 bers. 19 species. 



7. Familia. Teichonidae. Heterocoela, the surface of which is 

 differentiated into one bearing Oscula, and one bearing inhalant 

 pores. 3 species. 



6. Notes on the direction of the hair on the back of some Kangaroos 

 By N. de Miklouho-Maclay. The peculiarity of inverted hair on the 

 back of some of the Kangaroo tribe is traced by the Baron in the genera 

 Dorcopsis, Dendrolagus and in one species of Osphranter [Osphranter rufus). 

 The paper also contains some remarks on the dentition of Dendrolagus 

 Dortanus. — 7. Note on Tribrachycrinus Clarkei M'Coy. By F. Ratte, 

 M. E. The previous descriptions of this fossil were taken from imperfect 

 inner casts only. Mr. Ratte has now been enabled to describe thoroughly 

 and illustrate this beautiful crinoid from an outer cast of the calyx in the 

 Australian Museum. The most important additions to previous descriptions 

 are the ornaments of the surface of the calyx, the attachment of the first 

 brachial article, and the plates of the roof of the calyx. — 8. On the Larvae 

 and Larva Cases of some Australian Aphrophoridae. By F. Ratte, M. E. 

 This paper describes the larval state of some small species of Rhynchota clo- 

 sely allied to the genus Aphrophora and belonging probably to the genus 

 Ptyelus. They are as yet imperfectly known ; but the description of their 

 larva cases and of some of the larvae discloses a feature probably quite new 

 to the science of entomology. These cases, unlike those of insects generally, 

 are true shells, containing at least three-fourths of carbonate of lime, and 



