1893.] Zoology. 829 
ZOOLOGY. 
Classification of the Actinize.—In his account! of the Actinise 
of the “Albatross” collections of 1887—88, Professor J. P. McMurrich 
gives first a historical résumé of the growth of our knowledge of the 
Actinians and then presents his own ideas of the limits and arrange- 
ment of the families, follewed by a description of the forms collected 
by the *Albatross" In the historical part we notice that the separa- 
tion of the Bryozoa (better Polyzoa) from the Ccelenterates is credited 
to Milne Edwards. We had always understood that the discovery was 
made by J. Vaughan Thompson in 1830. 
Changing the typographical arrangement Professor MeMurrich gives 
the following classification of the Hexactinians. 
A. Tentacles arranged in cycles ACTINLE. 
a. Column simple 
1. Tentacles cylindrical, smooth. 
* Sphincter absent or weak, entodermal. 
+ Mesenteries not numerous. Halcampide, 
+ Mesenteries numerous, Antheide. 
* * Sphincter entodermal, tentacles deciduous. 
Boloceride. 
xk Sphincter mesogleeal. 
No acontia. Paractide. 
- + T Acontia. Sagartide. 
* kkk Sphincter entodermal, circumscribed. 
+ Acrorhagi wart-like. Bunodide. 
+ + Acrorhagi foliate. Phyllactide. 
2. Tentacles warty or branched. 
entacles simple. Heteractide. 
* * Tentacles compound. Thalassianthide. 
3. Tentacles reduced to stomidia. | Bigger ^ a : 
b. Column provided in its upper part with branched or globular 
rocesses, Dendromelide. 
e. Free swimming forms. ` Minyidz. 
B. Tentacles arranged radially STICHODACLYHIN 
a. Tentacles all of one form. 
1. Tentacles few, capitate Corallimorphide. 
2. Tentacles numerous, cylindrical. Discosomide. 
1 Proc, Nat. Mus., XV., p. 119, 1893. 
