Gatlij Marine Lahoralory , St. Andrewft. 43 



continue to the posterior end. Tn the bristled segments 

 anteriorly they oceiir on slightly elevated ridges a short 

 distance below the setigcrous processes, with the exception 

 of the first which is close to the base of the process. The 

 ridges become more prominent before the bristles cease. The 

 rows are often conspicuous from their brownish colour. The 

 golden hooks of the first row not oidy diverge in position, 

 but in structure, for they are larger and longer, have trans- 

 lucent shafts which dilate a little above the base, and again 

 gradually diminish to the neck which is curved backward, 

 the tip being boit at a little more than a right angle and 

 tapered to a sharp point — slightly turned up in some. The 

 second series shows hooks of the normal outline, besides 

 others imperfectly formed — with shorter i^hafts, and slightly 

 curved bifid tips, — a distal longer and another shorter ])i-ocess 

 at a distance below it. The typical hook has a long, slightly 

 curved, finely-striated shaft, which is slender at the base, 

 dilates gradually in its progress to the shoulder, near Avhicli 

 it diminishes, the neck then being bent a little backward, the 

 enlarged crown having four teeth above the main fang, which 

 is powerful and sharp. 



The uncinigerous processes become more prominent on 

 slightly flattened lamelhe with wider truncated tips behind 

 the bristled region, and attain their maximum about the 

 twentieth before the end, and gradually diminish backward. 

 In this region the hooks are all of one kind, and essentially 

 different from those in the anterior region. Each hook has 

 a convex posterior region with a deep dimple above the base, 

 three large teeth above the main fang, the anterior outline 

 presents a slight process below the main fang, and the base 

 is convex interiorly and short, the somewhat abrupt anterior 

 outline making but a short process. The importance of the 

 form and of the functions of hooks are well illustrated in 

 this species, which has no less than three kinds. 



3. On the Terebellidae dredged by H.M.S. ' Porcupine ' in 

 1869 and 1870, and bij the ' Knight Errant' in 1882. 



A variety of Amphitrite cirraia was procured in 690 fathoms 

 at Station 3, 1870, and various rare Terebellids from depths 

 ranging from 160 to 358 fathoms. Pista cristnta, O. F. M., 

 was dredged at Stations 2 and 6 (Atlantic), 1870, and Thele- 

 pus cincinnatus from 81 fathoms ofl:' Cape Finisterre and 795 

 fathoms at 17 b (Atlantic), Laphania boecki in 567 fathoms; 

 Avhilst Tricfiobranchus glacialis, Malmgren, occurred at 

 Station No. 3 (Atlantic), 1870, and Terehellides stroemi, 



