AND THE AQUAVIVARIUM. 149 



of various species of Polyzoa, exquisitely beautiful objects for the micro- 

 scope. The OeUdium comaum is another fine red weed, commonly of 

 small size and slender, but prettily fringed with processes all round the 

 edges of the leaves. This and the preceding are very hardy in confine- 

 ment, and form very suitable plants for an Aquarium. 



When we can no longer work at so low a level, we recede to the slopes 

 of the ledges yet uncovered, and find other species in the quiet sheltered 

 pools. A weed is found here, growing in dense mossy patches on the 

 perpendicular and overshadowed edges of the rock, which, when examined, 

 look.s like a multitude of tiny oval bladders of red-wine, set end to end in 

 chains. This pretty sea-weed is called Chylocladia articulata. 



Here also grows the stony Coralline, a plant bearing some resemblance 

 to that just named, in the peculiar jointed form of its growth. Low-lying 

 pools are often iucrusted with a coat of stony or shelly substance of a dull 

 purple hue, having an appearance closely like that of some lichens ; the 

 crust investing the surface of the rock, and adhering firmly to it, in irre- 

 gular patches, which continually increase from the circumference, in con- 

 centric zones. This is the young state of the Corallina officinalis, which 

 by and by shoots up into little bushes of many jointed twigs, diverging on 

 every hand, or hanging in tufts over the edges of the rock-pools. Young 

 collectors are eager, I perceive, to seize such specimens as are purely white ; 

 but this condition is that of death ; in life and health, the shoots are of 

 the same pale purple hue as the lichenous crust. This plant in both states 

 (for plant it undoubtedly is, though principally composed of lime, and of 

 stone-like hardness) is suitable for a tank, as it survives and flourishes 

 long ; and your pieces of rock-work you may select from such places as 

 are covered with the purple crust. 



The most valuable plant of all for our purpose is the Sea Lettuce (Ulva 

 latissima). Every one is familiar with its broad leaves of the most bril- 

 liant green, as thin as silver-paper, all puckered and folded at the edge, 

 and generally torn and fretted into holes. It is abundant in the hollows 

 of the rocks between tide-marks, extending and thriving even almost to 

 the level of high water, and bearing with impunity the burning rays of 

 the summer's sun, provided it be actually covered with a stratum of water, 

 even though this be quite tepid. It therefore is more tolerant than usual 

 of the limited space and profuse light of an Aquarium, where it will grow 

 prosperously for years, giving out abundantly its bubbles of oxygen gas 

 all day long. It is readily found ; but owing to the excessive slenderness 

 of its attachment to the rock, and its great fragility, it is not one of the 

 easiest to be obtained in an available state. The grass-like Unteromorphce 

 have the same qualities and habits, but their length and narrowness make 

 them less elegant. The Cladophora, however, are desirable ; they are 

 plants of very simple structure, consisting of jointed threads, which grow 

 in dense brushes or tufts of various tints of green. Some of them are 

 very brilliant ; the commonest kind is C. rupestris, which is of a dark 

 bluish-green ; it is abundant in most localities. 



Geneeal Outline op the Organisation of the Animal Kingdom, and 

 Manual of Comparative Anatomy. By Thomas Kymer Jones. 

 London : Van Voorst. 



This work has long been one of the most complete in our 

 language devoted to the subject of Comparative Anatomy. 

 At the same time such has been the great advance of anato- 



