130 Prof. M'liitosh's Notes from the 



In the 'Supplement to the Annelids of Xaples ^ (1870) 

 Claparede * repeats the generic characters he had previously 

 given, only adding that spatulate or pectinate bristles are 

 absent from the posterior region. He also diflferentiates 

 Psygmobranchus more definitely from Sahnacina by the 

 entire absence of buds in the former, and by the herma- 

 phrodite condition in Sahnacina ^ Avhich is to all intents and 

 purposes, he says, a Fitograna deprived of its operculum. 



In this publication he describes a new species, A. oedifi- 

 catrix t, characterized by the whitish granular tubercles 

 along the exterior of the filaments, the absence of eyes, and 

 the presence of nine thoracic segments, the other features 

 being common to it and the other species. He states that 

 this form is very near S. incrustans. which is found adhering 

 throughout its length to the surface of Fuci and other 

 marine plants, to the surface of shells, and other bodies, 

 whereas S. oedificatrix\% a deep-water form which constructs 

 masses, by the branching and anastomosing of its tubes, 

 identical in structure with those of Sahnacina dijsteri (from 

 which the Neapolitan form is readily discriminated by the 

 absence of enlargements at the extremity of the branchiae), 

 and so with Filoyrana. He thinks the structure of S. oedifi- 

 catrix leaves little doubt as to its reproducing by posterior 

 buds. 



In his figure of the collar-bristles he is more accurate than 

 Langerhans, the number of serrations on the fiattened basal 

 region being seven, and the hiatus is n^ore in accordance 

 with Nature ; yet the bristle, as a whole, does not differ in 

 any way from that o( Filograna. The other segments carry 

 bristles which do not differ from those of S. incrustans, and, 

 it may be added, from those of Filograna. He holds that 

 the hooks differ from those of S. incrustans, but it cannot be 

 said that his figure (pi. 13. fig. 1, E) represents a full lateral 

 view of the organ, but rather a partial lateral view, thus 

 giving it greater length proportionally than it really has. 

 These small organs are not readily mounted so as to exhibit 

 a complete lateral view, and thus the able Swiss author 

 was misled. They seem to agree with all the other forms 

 examined. 



Amongst other features, the author states that the 

 achetous region between the thorax and the first abdominal 

 bristles is equal to four or five segments, and that the abdo- 

 minal bristles are capillary and winged, with a "knee'-" at the 



* P. 154. 



t P. 157, pi. xiii. fig. 1. 



