Gaily Marine Lahoratory, Si. Andrews. 57 



nearly straif^ht posterior outline presents a hump above tlie 

 base ; the prow is rounded in front, and the elongated 

 base is gradually tapered backward and curved, so that, 

 mingled with the largely developed bristles which accompany 

 them, the structure of the hook-row is noteworthy, and it 

 is often difficult to distinguish the shaft of the bristle from 

 the long basal pedicle of the hook. The cuspidate bristles 

 (PI. I. figs. 7 & 8) which accompany the hooks have long 

 curved shafts, narrowed at the basal extremity, and also 

 constricted below the spear-shaped tip, which is bent at an 

 angle to the shaft and tapered to a fine point — longer in some, 

 shorter in others. So far as observed, no other species has 

 similar bristles, the majority showing the short paddle-like 

 forms. The posterior hooks (PI. I. fig. 9) are sharply 

 defined from the anterior by the truncate base and the 

 anterior projection or prow. They have the high crown 

 with the boldly marked teeth, and the absence of a prow 

 makes the neck long. The bases vary in length, that repre- 

 sented being an average example. 



Branchiomma kuUikeri, Claparede*, var, of B. vesiculosum? . 



Procured during the / Porcupine ' Expedition of 1870^ in 

 64 fathoms, in Setubal Bay. It was brought up on the 

 cup-lead. In general outline this somewhat resembles 

 Chone, though readily distinguished by the large eyes at the 

 tips of the branchial filaments and the number of the anterior 

 scutes. Dorsally the collar presents a deep median furrow, 

 with an eminence or boss on each side covered by a rounded 

 flap. A little behind this is the origin of the collar proper, 

 which springs from the dorsum of the second segment, 

 passes downward and forward, and ends in a rounded edge 

 on the ventral surface, but as the example had beeu injured 

 it was difficult to compare it with B. vesiculosum. 



Half of the branchial funnel seemed to be present, viz. 

 about thirty-one filaments, the first dorsal of each side beino- 

 much larger than the others. The filaments generally are 

 stiffer than those of Sabella, and in the preparation are 

 slightly coiled and the tips incurved. Each consists of a 

 stem flattened laterally and externally, the former having 

 the larger diameter and diminishing toward the tip, which 

 ends in a pair of compound eyes and a median process or 

 tentacle (PL IV. fig. 7), a slender tapering process. The 

 pinnae are of great length and slenderness, foi'ming a 

 delicate fringe to the inner edge of each filament, and they 



* Aunel. Cli^top. Nap, p. 423, pi. xxii. fig. 4. 



