PROCLEA GRAFFL 185 



The branchias spring from the second and third segments as stiffish simple filaments, 

 which project outward from the dorso-lateral region. They are faintly grooved and 

 comparatively few in number, four (somewhat larger) pairs occurring on the second 

 segment, two pairs on the third, and Mr. Southern thus likens them to those of 

 Euthelepus of the " Challenger," where only a single pair occurs in each segment. 



The bristle- tufts commence on the third segment, are fifteen in number and pale 

 golden in colour. The longer have slender cylindrical shafts with a slight back- 

 ward curvature at the slender, gently tapered tip, and narrow wings (Plate CXXVa, 

 fig. 6). The shorter forms have less elongate and perhaps less finely tapered tips, but 

 differ little. 



The anterior hooks (Plate CXXVa, fig. 6a) are avicular, minute, commencing on 

 the eleventh segment (ninth bristled), with a row of 9 hooks, on the tenth with 20, 

 on the eighteenth 93, and on the twenty-sixth 86 (Southern) in a single row without 

 alternation. Each is Thelepoid in character, with an elongate base which has a uniformly 

 convex inferior margin, the outline between the main fang and the simple conical prow 

 having a process directed downward and forward, whilst a larger and a smaller tooth 

 occur above the main fang. The posterior outline shows a convex crown and a well- 

 marked dimple above the posterior projection of the base. The posterior hooks (Plate 

 CXXV a, fig. 6 b) do not materially differ, though in some the prow is more pointed. 



These hooks, though minute, have much of the facies of those of Streblosoma bairdi, 

 yet according to the description of Mr. Southern the species differs in having only 

 fifteen pairs of bristles whereas Streblosoma has thirty-two. The hooks in Parathelepus 

 commence on the eleventh (ninth setigerous) segment, whereas in Streblosoma they begin 

 on the fourth bristled segment. 



Genus CLV. — Pkoclea, Be St. Joseph, 1894. 



Cephalic region witb a frilled lamella on each side of the mouth, and in front of it is 

 the plate for the tentacles. Behind the mouth is a lamella divided in the middle. Body 

 like that of Terebella, and the anterior segments have side-lobes. No branchiae. Bristles 

 of two kinds — smooth and serrated, commencing on the fourth segment, and few in 

 number. The shorter forms are whip-like or pectiniform. Hooks begin on the sixth 

 segment, in a double row in some segments. Both anterior and posterior free nephridia — 

 all with long tubes equally developed in both. 



1. Proclea graeei, Langerhans, 1884. Plate CXXVI, figs. 10 — 10 c — bristles and hooks. 



Specific Characters. — Cephalic region has ventrally a frilled lamella on each side of 

 the mouth ; above this is the flattened surface for the grooved tentacles. Buccal segment 

 has behind the mouth a small semicircular lamella split in the middle. Body about an 

 inch long, of typical Terebellid shape. Ventrally are ten glandular scutes, with the 

 uncinigerous rows at their sides. Smaller scutes occur in the median groove a 



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