ANNELIDA POLYCHAETA. 179 



Though it is very difficult to settle this question without 

 examining the type-specimens , it appears to me that Grube's 

 description probably is based on two different species ; other- 

 wise I cannot clear up the controversies in his descrip- 

 tions. In N. Stimpsonis the cephalic lobe should have the 

 same length as the buccal segment, in N. variegata on 

 the contrary it should be a little longer than the two fol- 

 lowing segments. In his paper» die Familie der Lycoriden", 

 on p. 16, Grube mentions N. Stimpsonis and N. variegata 

 as two different species , and in speaking of the structure 

 of the paragnathi (» papillae compressae" and » papillae 

 pectiniformes") , he only refers to N. variegata , not to N, 

 Stimpsonis. 



Therefore I believe it will be not without interest to 

 give a detailed description of our specimens. 



The largest individual is a female , in state of sexual 

 maturity; it measures 125 mm. in length and 11 mm. in 

 breadth at its widest part (with the feet). The number 

 of its segments amounts to 91. 



The cephalic lobe is a little longer than the anteropos- 

 terior diameter of the buccal segment. The antennae are 

 short , scarcely half as long as the head , extending till 

 the first articulation of the palpi. The tentacular cirri are 

 not long, not projecting beyond the tip of the antennae, 

 and reversed they reach till on the middle of the 2 nd segment. 

 The antero-posterior diameter of the buccal segment one 

 third longer than that of the following ring. The feet of 

 the anterior and the posterior body-region considerably 

 different in structure. In the anterior segments the dorsal 

 setigerous lobe short , rounded , papilliform , the ventral lobe 

 shorter, trapezoidal. The superior ligule of the same shape 

 and size as the dorsal lobe , the inferior ligule a little 

 shorter than the ventral lobe, obtusely conical. The dorsal 

 cirrus blunt and stout, projecting far beyond the tip of 

 the dorsal lobe, about twice the length of the superior 

 ligule ; the ventral cirrus on the contrary much shorter than 

 the ventral lobe. In the posterior segments the superior 



r^otes from the Leyden Museum, Vol. XI. 



