180 SPIOPHANES. 



This differs from the previous form in so far as the hooks appear before the tenth 

 bristled segment, probably at the eighth. Then at the fifth foot (Plate C, fig. 4) the 

 branchia is well developed, the upper lamella passes outward and upward as a broad 

 conical flap, whilst the bristles (Plate CV, figs. 8 and 8 a) form a diminishing series from 

 above downward. The inferior lamella is small, forming a short, blunt cone pointing 

 below the setigerous process, the outline trending thereafter to the body-wall. The 

 curved bristles do not present any feature of note. 



At the tenth foot (Plate C, fig. 4 a) the branchia is larger and somewhat flattened, 

 the upper free edge of the superior lamella is shorter, and five or six hooks have appeared 

 in the ventral division. These hooks (Plate CV, fig. 8 b) have straight shafts increasing 

 in diameter upward, then are curved forward, and again backward just below the wings, 

 whilst the great fang is again thrust forward so as to leave the neck at a large angle, and 

 is thus in contrast with many. No bristles accompany these hooks. The foot-glands are 

 well-developed, occupying fully the lower half of the foot, and are somewhat radiate in 

 arrangement. 



At the twenty-fifth foot the branchia is still large, but the superior lamella is small, 

 the bristles retaining the same character as in front. The inferior lamella is also small, 

 and in front of it are three or four hooks — as before, without bristles. The branchia is 

 somewhat less at the fiftieth foot, but the other parts do not offer any noteworthy 

 change. The condition of the specimen, however, as regards the soft parts is unsatis- 

 factory. 



Reproduction. — The single example is a female, with numerous and apparently nearly 

 ripe eggs which do not appear to have the rough capsule characteristic of such as 

 Scolecolepis vulgaris. 



3. ? Spio Atlanticus, Langerhans. 



A fragment dredged by Dr. Grwyn Jeffreys at a depth of 70 to 80 fathoms in St. 

 Magnus Bay, Shetland, in July, 1867, approaches Spio atlanticus, Langerhans, but as the 

 anterior region is imperfect, uncertainty remains. The dorsal bristles are of great tenuity, 

 and the ventral hooks are either broken or rendered indistinct. The posterior dorsal 

 bristles are remarkably long. Certain segments at the anterior end of the fragment 

 (Plate C, fig. 6) showed subulate lamellae, but whether dorsal or ventral is unknown. 

 The tail is terminated by short cirri, only two of which were distinctly visible. A hook 

 is figured in Plate CV, fig. 14. 



Genus XCIX. — Spiophanes, Grube, 1860. 



Cephalic lobe with two short frontal tentacles and a minute occipital papilla ; two 

 palpi, four small eyes in a rectangle, or none. Body vermiform, flattened anteriorly, 

 segments short. Short exsertile proboscis. Posteriorly it terminates in a wide vent with 

 two dorsal and two ventral crenations, the short cirri springing from the ventral pair. 

 Branchiae absent. Ventral lamella of the foot prominent only in the four anterior 



