4 Prof. M'Intosh's Notes from the 



in front are curved on themselves, and are highly vascular. 

 He thought they secreted mucus. 



He describes and figures the " cartilage " of the branchial 

 apparatus of Spirographis, with its (C perichondrium/' as if 

 this was a separate tissue, and the same tissues occur in 

 Myxicola and Protula. In his figure this structure is shown 

 as a rod with a single transverse series of septa in the 

 filaments, and his description of the general structure corre- 

 sponds with that in Bispira. His figures of the various 

 parts in the sections of Spirographis, though small, are 

 generally true to nature, for the author had equal facility 

 with pen and pencil. 



Lowe * (1878-9) distinguishes in the branchiae of the 

 Serpulids an ectothelium and an endothelium, the former 

 coating the outer surface of the bifid region in a section of 

 the filament, the latter the inner surface. He seems to agree 

 with Kowalewsky in regard to the homologies of the nervous 

 system of worms and vertebrates, and concludes with a com- 

 parison of the Sabellid skeleton with that of the embryo 

 dog's skull in horizontal section (his fig. 8). 



Cosmovici (1880) considered that, as in Myxicola, the 

 organ of Bojanus in the Sabellids was situated at the ante- 

 rior end, each organ, from a pouch which is longer than in 

 Myxicola, opening by a pore, the cilia of the interior causing 

 currents in this direction. The segmental organs are found, 

 he states, in each segment from the middle of the body to 

 the tail, and consist of a ciliated funnel behind the diaphragm 

 and a tube which opens below the setigerous process of the 

 foot. These organs transmit the reproductive elements, 

 which are developed in glands attached to the inferior lateral 

 vessel and extending to the superior lateral vessel. He thus 

 considered the thoracic glands the organs of Bojanus. 



A careful account of the thoracic glands aud other segmental 

 organs is given by Prof. Haswell f (188-1), who, in contrast 

 with the views of some later authors, could find no internal 

 opening of the former. His sections of the thoracic region 

 of Eupomatus, a Serpulid, agree on the whole with those of 

 Pomutucerus. He points out that the true segmental organs 

 are found in pairs in all the segments of the posterior or 

 abdominal region. He figures the appendix to the thoracic 

 glands in Eupomatus, but does not allude to it. The position 

 of the nerve-cords in relation to the ventral longitudinal 



* Zeitsch. f. w. Zool. Bd. xxxii. p. 158, Taf. ix. 



t Proc. Linn. Soc. N.S.W. vol. ix. pp. 7-12 (sep. copy). 



