FAMILY SPHAROMIDA. 99 
the inner lobe moderately or, generally, very well developed ; 
maxillee with the three distal lobes moderately long. Maxilli- 
peds with a single hook on the lobe from second joint; epipod 
very small, broader than long, or not discernible. Epimera 
not marked off from first thoracic segment; second to seventh 
epimera immovably fused with their segments, but generally 
some of them marked off by very fine, or nearly inconspicuous, 
furrows or lines. Five anterior abdominal segments com- 
pletely fused with each other, but, on the upper surface, 
transverse furrows—at most three and the two posterior 
broadly interrupted at the middle—are generally seen as 
traces of divisions into segments. Last segment generally 
movable (immovably fused with the preceding part in Vireia 
burgunda and Ceecospheroma Virei). Rami of plp. 
without plumose marginal sete; endp. of plp.* generally 
without sete, in rare cases with a few short plumose sete, 
at least endp. of plp.* and plp.° respiratory ; exp. of plp.°, 
generally with some—at least three—thickened areas or pro- 
tuberances densely clothed with minute scale-like spines (in 
Ancinella without spines, in Tecticeps wanting). Endp. 
of urp. fused with the sympod, or wanting. (The brood most 
frequently develops in pouches; mouth-parts in ovigerous 
females often strongly metamorphosed.) 
3. Plakarthriine.— Mandibles very slender; lacinia 
mobilis well developed, with plate on left mandible ; molar 
process wanting; palp rudimentary, one-jointed. Maxillule 
with the inner lobe rudimentary ; maxille reduced, showing 
only a narrow oblong plate terminating in three spines and 
some sete. Maxillipeds without any hook on the lobe from 
second joint; epipod not discernible. All seven pairs of 
thoracic epimera movable, large. Abdomen has all segments 
fused together, on the surface two interrupted furrows as 
rudiments of division. Exp. of plp.’, plp.*, and plp.° pellucid, 
scarcely respiratory, with numerous plumose sete along their 
distal margin; endp. of the same three pairs opaque, respira- 
tory, without marginal sete; exp. of plp.> without squam- 
iferous areas or protuberances. Both rami of urp. movable. 
