100 Dr. A. Philippi’s Zeological Notices. 
minime? Palpi duo, elongati, 5-articulati ; articulo quarto 
longiori, quinto brevi, acuminato. Coxe utriusque lateris 
unite, antice due in linea mediana quoque sese tangentes. 
Pedes unguibus duobus uncinatis terminati. Vulva lamina 
crustacea granulata cincta. 
Puate IV. Fig. 4. Pontarachna punctulum, Phil. Drawn magnified sixty 
times. 
g. Nat. size. 
Fig. 5. The body beneath, magnified ninety times. 
d. The palpi. 
e. The coxz. 
f. The plate surrounding the fissure of the generative organs. 
7. Desmophyllum Stellaria, Ehrenberg. (Plate IV. fig. 6.) 
The genus Desmophyllum, established by Prof. Ehrenberg 
in the Memoirs of the Berlin Academy, is not less remark- 
able by the characters of its calcareous stem, which is econ- 
stantly unramified, and has fascicularly united lamellz of the 
star (Sterne), than by its animal. In this the surprising thin- 
ness of the mantle is above all remarkable, which seems to be 
entirely missing, so that we can most distinctly perceive 
through it the cells at the margin of the star, nay, even the 
slightest roughness of the surface. Indeed the animal mass 
is in proportion to the calcareous mass a true minimum, and 
so retracts itself on the contraction of the animal into the cavi- 
ties of the lamellz, that I regarded the individual I received 
in this state for the mere house, long before deprived of its in- 
habitant. I have likewise observed the same on Cladocora 
cespitosa, Ehrenberg (Caryophyllia, Lamk.), while the ani- 
mal] mass of Cladocora (Caryophyllia) Calycularis is far more 
considerable, and even on drying remains as a pretty thick 
membrane. When the animal of Desmophyllum Stellaria has 
fully expanded itself, it projects about a line above the star, 
while the border to a good breadth seems to be without any 
animal envelope. The yellowish coloured oval mouth, sur- 
rounded by an inwardly and outwardly folded lip, is distinctly 
perceptible. True ¢entacula are missing; a greenish fleshy 
mass extends from the mouth to near the margin of the star, 
and is there drawn out into several folds, at the apex yellow- 
ish, which, however, do not evince any definite arrangement, 
yet generally exhibit two rows. When the folds are most di- 
stinct they project at the furthermost only 4rd of a line; greater 
I have never seen, although I have preserved the animal alive, 
and observed it for several days. By this want of true ¢en- 
tacula the genus differs, likewise with respect to the animal, 
very essentially from Cyathina, Ehrenberg, where the ¢enta- 
cula are very regular, filiform, and orbiculate (gekn6pft). All 
Se 
et aes 
