134 Prof. M'lntosh's Notes from the 



the tube of tlie parent. Moreover, S. dysteri reproduces hy 

 buds, as in F. implexa, the nurse-stoek of seven or eight 

 anterior and fifteen to sev^iteeu posterior segments, without 

 sexual elements, giving rise to a bud at the eighth or ninth 

 posterior segment as in Filograna iitiplexa. He concludes 

 by stating that S. dysteri is met with in different con- 

 ditions : — 



1. As a hermaphrodite form without buds, measuring 

 6 mm., M'itli the anterior segments of the abdomen enclosing 

 the male and female sexual elements, the following segments 

 constricted, and the terminal enlarged. 



2. As a short annelid of twenty posterior segments, without 

 tlie filiform portion of the abdomen and which prepares for 

 budding, or perhaps has already budded and regenerated, the 

 detached segments. 



3. As a form of the same size as the preceding with a l)ud 

 at the eighth or ninth posterior segment. 



4. As a shorter form from which a bud has been detached, 

 whicb possesses only nine or ten posterior segments and is 

 devoid of eyes. 



In regard to the resemblances between Filograna implexa 

 and the present species, they are identical except for the 

 absence of the opercula in Salmacina. He mentions the 

 case of the Protula described by Fritz Miiller, which acquired 

 an operculum on one of its pinnate branchiae ; then the 

 barbules disappeared, and the filament became the stalk of 

 the operculum. In Salinacina dysteri at complete maturity 

 he found each of its branchiae terminated by a mass which 

 offered no indication of an operculum ; and, since Filograna 

 implexa at complete maturity retains its two opercula, he is of 

 opinion that the two species are stable and distinct. Yet 

 this very statement shows that betsveen S. dysteri and 

 S. (edificatrix there is a facile step on this head alone. 



In referring to the proposal of Elders to suppress the 

 genus Sahnacina, Claparede, since its bristles resemble those 

 of Filograna, De St. Joseph would conserve the genus Filo- 

 grana as revised by Ehlers, but would divide it into two 

 subgenera — viz., Filograna viith. an operculum and Salmacina 

 without one. 



De St. Joseph found on the tubes Folliculina ampulla and 

 F. atrojmrpurea, anastomosing amongst them and the minute 

 sponges, and Corynids and ova were also present. He 

 observes that the dorsal hooks in the posterior region 

 resemble the thoracic ventral hooks, but their rows are short 

 and their number few. 



J 



