6 Prof. M'Intosh's Notes from the 



the filaments (pi. xxi. figs. 20-22) ; and, lastly, he gives an 

 account of Sabella melanostigma (pi. xxi. figs. 17-19). 



A large memoir on the structure of the Tubicolar Polychsets 

 (chiefly Sabellids and Serpulids) was published by Soulier * 

 (1891) . It deals particularly with such forms as Spirographis 

 spallanzani, Viviani, Branchiomma vesiculosum, Montagu, 

 Sabella viola, Grube, Myxicola infundibulum, Montagu, 

 and M. astlietica, Claparede; whilst amongst Serpulids 

 Protula milhaci, Marion, Serpula infundibulum, D. Chiaje, 

 and Hydroides pectinata, Miiller, were specially studied. 

 Interesting accounts are given of some of these in captivity, 

 including the formation and structure of their tubes and 

 other features. His interpretation of the structure of the 

 anterior "nephridia" (pericesophageal glands) for the most 

 part agrees with that of Ed. Meyer. The histology of the 

 skin and other organs is described with great detail in 

 this paper. 



A memoir by Ed. Meyer f on the Sabellidse and Serpulidse 

 (his Serpuliden) was published in Russian in 1893. A 

 careful account of the nephridia in Eupomatus and Psygmo- 

 branchus and the structure of the body- wall is given, along 

 with the structure of the nephridia in Sabellaria alveolata. 

 Late stages in the development of Psygmobranchus pro- 

 tensus further elucidate the subject. Like Soulier, he 

 describes and figures a ciliated funnel opening into the peri- 

 visceral cavity at the cephalic end of the anterior segmental 

 organs or thoracic glands. Since the work of Claparede no 

 investigator except Eisig has more fully dealt with the 

 structure of the Polychsets, more especially of the Sabellids 

 aud Serpulids, and his memoirs in the Naples ' Mittheil- 

 ungen ' J are models of patient research, skilful draughts- 

 manship, and general accuracy. 



Otocysts were early described in the Sabellids by 

 De Quatrefages (1841) in an Amphicora, and, amongst 

 others, Claparede, Langerhans, Meyer, Brunotte, De 

 St. Joseph, Caullery and Mesnil, Soulier, and Fauvel have 

 studied their occurrence in this group. The most compre- 

 hensive account is given by Fauvel § (1909), who describes 

 them in Branchiomma vesiculosum, in the first bristled 

 segment, in two species of Potamilla, viz. Potamilla reni- 



* These, ' Etud. sur l'Anat. des Anuel. Tubic. de la Celte, Secret, du 

 Tube, &c.,' Moutpellier, 1891. 



t ' Die Organisation de Serpuliden u. Hermelliden,' Kasan, 1808, 3 pis. 



X E. g , 13d. vii. and Bd. viii. 



§ Ami. Sc. Nat. 9 stSr. t. vi. pp. 1-144, pis. i.-iii. 



