40 The Microscope. 



central cusps being long, acuminate, and reaching almost to the 

 external wall, while the posterior ends are continued as outwardly- 

 curving prolongations reaching to the same limit. These thicken- 

 ings are visible only when the Chretonotus is viewed dorsally or ven- 

 trally. 



The eggs vary somewhat in size, and extensively in ornamenta- 

 tion. Of the last there are three patterns. In one, the side and ends 

 of the egg bear low, stout and hollow processes, whose ends are 

 truncate and four or five parted when viewed from above (fig. 25). 

 Eggs thus armed measured 3!^ inch in length. In another, the 

 appendages are long, conical, hollow spines whose distal ends are 

 trifid or quadrifid, the branches appearing very fine and delicate 

 when in profile, but from the above the same branches are seen to 

 taper to their ends where each terminates in a widely spreading fur- 

 cation (fig. 26). These eggs measured -^^ inch in length. In the 

 third pattern, one side and the ends of the membrane were covered by 

 an irregular net-work of raised lines, the meshes having four, some- 

 times five angles, while the opposite side of the egg was ruo-ose with 

 fine, minutely sinuate lines. These eggs were ^l^^ inch long. 



15. ChcetonoUis acanthodes, sp. nov. — Plate II, figs. 28-30. 



From a little Sphagnum swamp near my home I have taken in 

 small numbers a Chcetonotus measuring yi^ inch in length, with 

 the greater part of the cuticular surface wondrously well armed, even 

 the ventral aspect having a protective covering. It possesses both 

 spines and scales, the latter imbricated and their free margins 

 directed forward, each one bearing a small supplementary scale, or 

 scale-like thickening, from which springs a recurved spine (fio-. 29). 

 At a short distance behind the body-centre the dorsal surface is trav- 

 ersed by a series of large, stout spines rising obliquely upward and 

 backward, and forming a kind of spinous hedge. On the surface 

 behind this the conical appendages are few and small; very often 

 they are entirely suppressed, except on the lateral margins. On 

 each side near the bifurcation there are two large spines. In fig. 29 

 the scales are more nearly correct in shape than in fig. 28, where thev 

 are too evenly rounded, and where also the appearance of the double 

 scales has been purposely omitted. 



The ventral space between the ciliaiy bands is entirely and 

 closely beset with short, fine, recurved spines or prickles, and five or 

 more long bristles project from the same surface beyond the border 

 of the posterior bifurcation (fig. 80). The egg I have not seen. 



