Gaily }fiirinG Laboratory, St. Andrewa. 43 



continue to tlic posterior end. In the bristled segments 

 anteriorly they occnr on slightly elevated ridges a short 

 distanee hclow the setigerous processes, with tiie 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 lirst row not only diverge in position, 

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

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

 gradually diminish to the neck which is curved backward, 

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

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

 second scries shows hooks of the normal outline, besides 

 others imperfectly formed — with shorter shafts, and slightly 

 curved biHd tips, — a distal longer and another sliortcr j)rocess 

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

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

 dilates gradually in its progress to the shoulder, near which 

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

 enlarged crown having four teeth above the main fang, w hich 

 is i)owerful 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 

 dilfcient 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 infcriorly 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 

 tliis species, which has no less than three kinds. 



3. On the Tercbellidae drcdrjnd hj If.M.S. ' Porcupine ' in 

 18GU and 1870, and bij the ' Kn'ujht Errant ' ia 188.^. 



A variety of AmphHritecirrata was procured in GOO fathoms 

 at Station ;j, 1870, and various rare Tercbellids from dc[)th3 

 ranging from IGO to 358 fathoms, Pista cristnta, O. 1*\ M,, 

 Avas dredged at Stations 2 and G (Atlantic), 1870, and Thele- 

 pus cincinnalus from 81 fathoms oft" Cape Finisterrc and 795 

 fathoms at \7 b (Atlantic), Lapkania boecki in 5G7 fathoms; 

 whilst Tricliobranchus (/lacialis, Malmgrcn, occurred at 

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



