Gatty Marine Laboratory^ St. Andrews. 263 



(Aglaophanus, Kbg.) I'nermis, Elilers *. It was first ob- 

 tained in the American expedition in the ' Bhike,' under 

 Count Pourtale*, in 1869^ off Alligator Reef, at a depth of 

 53 fathoms ; but the description was twenty years later in 

 being ])ublished. The head is somewhat pentagonal, nearly 

 straight or slightly convex in front, and devoid of the tentacles 

 at each angle. The ventral tentacles are small and subulate, 

 but occupy the usual position, though they do not project 

 laterally. The buccal region considerably diverges, for there 

 are no folds in front of it and only a median and two lateral 

 grooves behind it. The body somewhat resembles that of a 

 Nereis, from the great length of the branchial processes, which 

 project like cirri. The proboscis (PI. VII. fig. G) is perfectly 

 smooth, though Kinberg f, in his original description, gave it 

 two fusiform maxilla3. 



The typical foot in the anterior region (PI. VII. fig. 7) 

 shows comparatively short and widely separated divisions. 

 1'he dorsal lamella is of moderate height and extends far 

 outward. The dorsal cirrus is large, long, closely attached to 

 the base of the branchia, which is long and coiled inwards 

 and has a cylindrical papilla at its base externally. The 

 bristles are dark and occur in a small and somewhat elliptical 

 area, having the spine in the centre. The posterior tuft is 

 composed of simple, ratlier stout and short, tapering bristles, 

 with minute seri-ations on the edge of the blade (PI. V1I[. 

 fig. 1), shorter lyrate forms (PI. VIII. fig. 2) being mingled 

 witli them. The anterior tuft is also dark and has long and 

 finely tapered bristles with indistinct transverse markings, 

 which fade towards the tapering extremity (PI. VIII. fig. 3). 



Tiie inferior division of the foot has a large spathulate 

 lamella superiorly, while the cirrus projects nearly as far, as a 

 somewhat conical process. The tip is thus bifid in lateral 

 view. The bristles form a loop closed superiorly and open 

 interiorly — that is, the anterior tufi touches the posterior 

 superiorly but is separate inferiorly. The rudimentary con- 

 dition of the transverse markitigs in the anterior bristles, for 

 they form closely arranged and somewhat indistinct granular 

 bars, is interesting. A peculiarity of the ventral division of 

 the foot is the presence of a fold of skin passing as a free flap 

 backward and then slightly upward, so as to form a process 

 between the feet. Viewed from the ventral surface each foot 

 thus is ensheathed at the base. 



* Ehlers, Mem. Mas. Corap. Zool. Harvard Coll. vol. xv, p. 125, 

 Taf. xxxviii. ti<rs. 1-6 (1887). 

 t " Aunul. Nova,'' (EfversigtK. Vet.-Akad. Fuihandl 1SG5, p. 229. 



