MARPHYSA K1NBERGI. 451 



branchial feet, again, differ in so far as the lower of the two spines separates from the 

 upper and is joined by a second, and their tips are differentiated into bifid winged hooks. 

 Thus at the fortieth foot the main spine is blackish brown, and both the tips and the 

 concavity are directed upward. A pale spine considerably less lies above it. The two 

 bifid hooks have their convexity directed upward, and their tips project a short distance 

 below the spine. The older' is usually dark brown, and the younger pale brown, the tips 

 in both being pale, bifid, and winged (Plate LXXXVI, fig. Bd). The four kinds of 

 bristles are still present, though their number appears to be fewer. This type of foot 

 continues to the posterior end, as a rule one strong blackish brown spine and long bifid 

 hook guarded by a wing being found in each setigerous process, with the three kinds of 

 bristles — all, however, diminished in size. Both the posterior lamella and the ventral 

 cirrus are more pointed posteriorly. 



Habits. — In confinement in a vessel it keeps its body in screw coils amongst sand. 



This is one of the many forms which the able authors 1 of the ' Annelids of the 

 Coast of France ' have added to the literature of the subject, and their description so far 

 as it goes is good. 



De Quatrefages 2 considered that he had found another species allied to this form at 

 Chaussey, but the description does not appear to distinguish it from the earlier one. 

 He omits notice of this form, moreover, in the ' Anneles.' It may be, however, that 

 the author thought that the description of Audouin and Edwards did not apply to a 

 species with three kinds of bristles, besides the brush-shaped ones, in the anterior 

 feet. He afterwards, perhaps, considered that the differences were due to defective 

 descriptions. 



Ehlers describes the branchias of the American forms as occurring on the fifteenth 

 foot, and being fourteen pairs in number, whereas Marenzeller notes in the Adriatic 

 forms that they commence on the twelfth, and that their number is from fifteen to 

 twenty-five. Considerable variation is thus present. 



3. Marphysa Kineeegj, 3 ii. s. P]ate LXXIV, figs. 9 and 9 a — feet and branchise ; 



Plate LXXXIII, figs. 6-6 b— bristles. 



Specific Characters. — Head bluntly conical, without a trace of a notch dorsally in 

 spirit ; ventrally a well-marked median groove ; median and lateral tentacles of con- 

 siderable length, the former the longer ; no eyes visible in the preparations. Body 

 small, scarcely f in. in length, more massive in the preparation anteriorly than posteriorly. 

 It is somewhat flattened anteriorly, rounded posteriorly, but is incomplete. The maxillas 

 are chocolate brown, with darker blades, which do not rise much above the horizontal. 

 Posterior processes — to which they are articulated — are lobate. Great dental plates have 

 six teeth, the anterior being long and recurved, and a considerable portion posteriorly being 

 smooth. Azygos plate with seven teeth. Anterior curved plate on the right has six 



1 Audouin and Edwards, ' Anne]./ p. 149, pi. hi, figs. 1-4 and 8—9, 1834. 



3 ' Magasin de Zoologie/ An. 1843, p. 4, pi. ii, figs. 1, 2. 



3 Named after the late Prof. Kinherg, of Stockholm, who did much to advance our koowledge of 

 the Marine Annelids. 



