Galtij Mitritte Labor at ori/^ St. Andrews. liU 



tip. At the base of the brancliial pinnaj are rows of granular 

 cushions, but all lu; says al)oiit the extremity of the 

 filaments is that they are bare, and in his drawing they are 

 somewhat delicately tapered. 



(iiard* (1875 and 187(5) madctwo.noteson the development 

 of Sulmacina dijstcri, Huxley, with fi^tires, from the early 

 ovum to the post-larval staj^e, havin<^ three pairs of bristles. 

 The description and figures of tiiis aljle and industrious 

 author are excellent. 



Langerhansf (1880) describes Salmacinu incrustans from 

 ]S[adeira as occurring iu tubes on stones between tide-marks 

 and on fish-basUets. The terminal process of tlie brauehifc 

 lias a coloured cushion comjjoscd of epitlielial cells and at 

 the tips of tlic pinnaj "eiuige solche Zellen." In the 

 Mediterranean form these cells Wi-re absent. A pair of eyes ; 

 five to seven sotigerous segments anteriorly, the first bearing 

 the cliaracteristic bristles, one of which he figures with five 

 serrations on the wide basal [)rocess below tlie iiiatus (Taf. v. 

 lig. -AO i), and the other with a serrated edge devoid of a 

 hiatus, but Neapolitan examples of the species show smaller 

 and more numerous serrations on the basal web of the tip, 

 viz., about double the number indicated by Langerhans, and 

 the hiatus is less pronounced. This remark is made on the 

 .suj)position that the form from Madeira is the same as that 

 at ^s'^aples. The ventral uiicini have only five teeth above 

 the main fang, whereas in S. a'd'ificatrix there are six-; yet 

 in the ligure of the face of the hook in each case there are 

 nine transverse rows. The anterior bristle with the curved 

 (sickle-like) tip and serrations is also present, though the 

 figure is indifferent. Bristles with smooth wings occur in 

 tliis region, but he docs not indicate any dillerentiation at 

 the tip of the tail, though he describes those of aS'. (edificatrix 

 as having serrated wings. In the Neapolitan examples the 

 serrations of the tip were less prominent. 



Cams (1885) distinguislics Sulmacina thus : Thoracic 

 membrane ; branchiie ecjual, base circular, destitute of an 

 cpereulum. First thoracic segment with a tuft of bristles 

 ho'ger than the succeeding and of a distinct form, semi- 

 cieuulate. From the third segment, besides winged setcne, 

 are others scmiercnulatc. Spatulatc and pectinate bristles 

 absent from the abdomen — only simple falciform bristles. 



He makes Claparede's S. incrustans synonymous with 

 ? iierpula Jiloyruna, Saeehi, and so with ? Serpulu intricata, 



* Coniptea Rend. Acad. Sc. 17 January, 187>J, and 24 January', 187() 

 Also ' (lOuvres Diversea,' p. 'UG. 



t Zeitsch. f. wisa. Zool. Jld. xxxiv. p. 122. 



