Notes from the Gatty Marine Lahoralory. 83 



VII. — Notes from the Gntty Marine Lahoratory, St. Andrews. 

 —No. XXXIV. By Vvot M'Intosii, iM.D., hh.D., 

 F.R.S., &c. 



[Plates II. & III.] 



1. On PionoKi/ltis altp7-7w.-ifitosa, De St. Jo.seph, and its relation to Si/llis 



armil/(iris, O. F. Miiller. 



2. On tlie Hiiti.sii Maldanid(e. 



3. On the Maldanidce dredged in the ' Porcupine ' Expeditions of 1809 



and 1870. 



4. On tiie Maldanidcr dredged in the Gulf of St. Lawrence, Canada, by 



Dr. Whiteave3. 



5. Ou the Maldanidce procured by Canon Xorman in Norway. 



1. On Pionosyllis alternosetosa^ De St. Joseph, and its 

 relation to Syllis armillaris^ O. F. Miiller. 



Considerable doubt was felt in regard to certain Syllids, 

 such as PionosyUis alternoselosa and Syllis brevicirrata, iu the 

 Ray Society Monograph ; and further examination has 

 shown that the former is only Syllis armillaris, which is 

 common on the shores of the Channel Islands — not very 

 distant from the region at which De St. Joseph worked, and 

 which appears to have been unfamiliar to him and also to 

 Major Ehves at Torquay. There is no character, indeed, by 

 which the one may be separated from the other, and in this 

 view Mr. R. Sothern, who is doing excellent work on the 

 Polychfeta of Ireland, agrees. In comparing the two forms 

 the external coloration is the same. The head, palps, eyes, 

 and tentacles are identical, and the presence of an additional 

 eye-speck or two in the southern form is of secondary 

 importance. The same structure is found in the proboscis, 

 proventriculus, and the rest of the alimentary canal. The 

 cirri have the same ari'angement in both, those with more 

 numerous articulations being confined to the anterior region, 

 and in both forms they are carried alternately horizontally 

 and erect. The foot has a like structute in both [cf. Ray 

 Soc. vol. ii. pt. 1, pi. Ixx. fig. 14, and vol. ii. pt. 2, pi. Ixxvii. 

 fisf. 12). About a dozen of the anterior bristle-tufts have 

 longer terminal pieces, and the same feature is noticed in 

 those of the caudal segments. The typical bristles iu each 

 have the same structure (c/. op. cil. pt. 2, pi. Ixxx. tigs. 8 & 9, 

 and pi. Ixxxvi. fig. 3), 



It may be noted that De St. Joseph correctly draws atten- 

 tion to the presence of a simple dorsal bristle in the terminal 



6* 



