302 Prof. Mcintosh's Notes from the 



Langerhans describes an unpaired median appendix between 

 the anal cirri. Feet >vitli the fusiform dorsal cirri trun- 

 cated, with bacilli in the interior. Ventral cirri filiform, 

 short, the ventral bristle is bidentate, and with spines along 

 its margin distally. 



Reproduction. — Ripe females were found by Dujardin, 

 Marenzeller, and Langerhans, the latter stating that in one 

 with thirty segments two eggs occurred in each segment 

 fj'ora the eleventh to the twenty-second. De St. Joseph 

 (1886) mentions that the males have swimming-bristles and 

 sperms ; whereas the females are devoid -of swimming- 

 bristles, and carry two eggs ventral ly on segments 10-26. 

 But he has also met with one devoid of swimming-bristles 

 carrying embryos on the dorsum from the tenth to the 

 fifteenth segment (six segments). Usually they are fixed 

 by their anal segment to the ventral surface of the parent, 

 near the ventral cirrus, and so placed that their dorsal sur- 

 faces are in keeping with that of the mother. 'J'hey have 

 four eyes in a line, three tentacles, four tentacular cirri on 

 the buccal segment, rudiments of proboscis and proventri- 

 culus, whilst a mass of orange yolk occupies the position of 

 the intestine. There are four setigerous segments and the 

 anal has two small cirri. The dorsal cirri have the trun- 

 cated form of the adult, but contain no bacillary bodies ; 

 and they are absent from the second setigerous segment, 

 thus (lifi'ering from the adult. ']"he minute ventral cirri 

 are present on four segments. The palpi, longer than the 

 head, are less attenuate in front than in the adult. He 

 further notes, as a distinction between this species and 

 G. clavata, that the embryos are developed in eggs on the 

 dorsum of the parent, whence they escape when sufficiently 

 advanced ; whereas in G. pusi/la they are developed on the 

 ventral surface of the mother, to which they reniam adherent 

 after leaving the egg. He adds a caution, however, that 

 possibly variations occur in both. 



Prof. Haswell I'as found a hermaphrodite condition of the 

 species iu Australia (Port Jackson), for one or two male 

 segments are followed by a number of female ones, thus re- 

 sembling such Seri)ulids as Filo(/rana. In G. quudrioculata 

 he found the ova attached dorsally between the cirrus and 

 the foot. Mr. Southern met with a mature male in March, 

 whilst specimens with embryos attached occurred in May. 



Sphcerosyllis erinacens, Claparede, comes also from the 

 west coast of Ireland. It was introduced by Claparede 

 (from Normandy) as having a body about 2 mm. long. 

 Palpi broad, almst club-shaped when viewed from the 



