FIG. 14.—_Scolopendrella immaculata_, from above,—after Lang; also from beneath, the genital opening on the 4th trunk-segment: _sac_, eversible or coxal sac; _an_, anus; _c_, cereopod; _v_, vestigial leg.—After Haase, from Peytoureau. _A_ _B_ _C_, head and buccal appendages of _Scolopendrella immaculata_: _A_, head seen from above; _cl_, clypeus. _B_, head from beneath; _l_, first pair of legs; _mx_, 1st maxilla; _mx_^1, 2d maxilla; _t_, “labial plates” of Latzel, labium of Muhr. _C_, 1st maxilla; _l_, lacinia; _g_, galea; _p_, rudiment of the palpus.—After Latzel. _D_, end of the body: _p__{11}, eleventh, _p__{12}, twelfth undeveloped pair of legs; _p__{13}, modified, vestigial legs, bearing tactile organs (_so_); _sg_, cercopod, with duct of spinning gland, _dg_; _cd_, eversible or coxal gland; _h_{8}s_, coxal spur of the 11th pair of legs.—After Latzel from Lang. ] Wood-Mason considered it to be a myriopod, and “the descendant of a group of myriopods from which the Campodeæ, Thysanura, and Collembola may have sprung.” We are indebted to Grassi for the first extended work on the morphology of Scolopendrella (1885). In 1886 he added to our knowledge facts regarding the internal anatomy, and gives a detailed comparison with the Thysanura, besides pointing out the resemblances of Scolopendrella to Pauropus, diplopods, chilopods, as well as Peripatus. [Illustration: FIG. 15.—Section of _Scolopendrella immaculata_: _œ_, œsophagus; _oe. v_, œsophageal valve entering the mid-intestine (“stomach”); _i_, intestine; _r_, rectum; _br_, brain; _ns_, abdominal chain of ganglia; _ovd_, oviduct; _ov_, ovary; _s. gl_, silk-gland, and _op_, its outer opening in cercus, _ur. t_, urinary tube; _cg_, coxal glands or blood-gills.—Author _del._ ]