150 
2. Frontal border produced into a good-sized, anteriorly blunt, plate. Caudal stylets wanting. 
27. S. decorata 
2’. Frontal border slightly produced. Caudal stylets good-sized... 2... . 28. S. modesta 
3. Front strongly produced; seen from below, it tapers considerably towards the distal end, 
then expands into a tolerably broad disk, the margin of which — except posteriorly — 
is provided witha sinele: row Ob fine) PLOCESSeS) jon.) ie) sc) oiler eueeuennen iste AL 4 
3’. Front broad and somewhat emarginate in the middle: fie margin with some rows of 
fINCMPNOCESSESSEs arse he ehcrss sf thes vee sen eviorey Sane neds Hoe poo ooo 6 aL. S, TanAm aI 
At Hrontalledisken canliyaccrncullar =r ss cere oe re eet renee EP 
4’. Frontal disk broader than long, with rectangular lateral angles... . . 30. S. insignis. 
27. Spheronella decorata n. sp. 
(Pl. VII, fig. 3a—30o; pl. IX, fig. 1a—1b.) 
FEMALE. The largest specimen, represented in fig. 3a, is 2°15 mm. in length and 
247 mm. in breadth, and it has laid six ovisacs; another specimen, only 1°33 mm. Jong and 
1°52 mm. broad, has laid eight ovisacs. Thus the body is broader than long. The small 
head is distinctly defined from the trunk; it is comparatively well chitinised all over, except 
in the part which surrounds the mouth-appendages and is limited by the low lateral borders, 
and this part, forming a triangle, is prolonged anteriorly beyond the antennule, continuing 
a rather good distance along the dorsal side of the head, where this peculiar extension termi- 
nates in an acute angle (fig. 3d). So there is no real frontal border. Antennule (fig. 3e) short, 
2-jointed, the two first joints being coalescent; sete short. Antenne tolerably short, 2-jointed, 
the basal joint short, second joint longer and thicker, terminal seta short. Maxillule well 
developed, additional branch good-sized, with a distinct foot. Maxillee middle-sized, basal 
joint smooth, but numerous chitinous taps appear on the inner side of the large membrane 
between the first and the second joints. Maxillipeds.powerful and comparatively pretty long; 
the basal joint on its anterior side and on a small part of its inner side, bears four or five 
groups of very small prickles (rudimentary hairs), arranged in transverse belts; further, at 
a short distance from the distal margin, a transverse row of very fine hairs, besides similar 
hairs on the distal margin itself; second and third joints coalescent, the distal spine long 
and rather slender, with fine processes on its inner margin; last joint a little expanded 
towards its rounded, flattened end, which terminates in numerous fine processes arranged in 
a line. The sub-median skeleton slightly developed; a ventral transverse list between head 
and trunk, and adjoining the anterior margin of this list, an odd, good-sized, considerably 
vaulted eminence, which is rounded, a little broader than long, and provided at its median 
anterior part with a rounded protruding plate. Lateral margin of the head naked. Trunk 
naked. Genital area (fig. 1a) considerably smaller than the head (fig. 3a), nearly as long as 
