ON JULINIA. 5 



continuation of the test- substance on the lower surface of the 

 languets as is seen in Fragaroides, In the abdomen the 

 loop of the gut lies transversely to the dorso-ventral axis, the 

 oval stomach being on the right side. On the dorsal side of 

 the loop is the ovary, coutaining one or two large orange- 

 coloured ova. In front of this the opaque white vas deferens 

 leads forwards to the cloaca. The heart in its pericardium 

 lies on the ventral side of the abdomen. 



Branchial Cavity. — The buccal siphon is short, ending in 

 front in six simple rounded lobes (PI. 1, fig. 8). It is lined as 

 usual by a reflected portion of the test, and a strong sphincter 

 muscle is developed in its walls (PL 2, fig. 21). The oral 

 tentacles (PI. 1, fig. 8) are twelve in number, situated on a 

 hexagonal ridge surrounding the base of the buccal siphon. 

 Six of the tentacles, situated at the angles of the hexagon, are 

 larger than the others which alternate with them. Separated 

 from the tentacles by the '' peribranchial zone " is the " peri- 

 pharyngeal band,^' here apparently a simple ridge, not grooved 

 as in Fragaroides. On the ventral side it is continuous with 

 the anterior end of the endostyle, while on the dorsal side it 

 appears to fuse, as in Fragaroides, with the small dorsal 

 tubercle which bears the simple rounded opening of the sub- 

 neural gland. 



The branchial sac is large and comparatively simple. There 

 are four rows of long and narrow stigmata, each row contain- 

 ing about twenty-four slits on each side (PI. 2, fig. 12). 

 Between the four rows three shelf-like membranes project into 

 the interior of the sac. These are the " lames iuterseriales '' 

 of Maurice, and are continued round the circumference of the 

 sac, being only interrupted by the endostyle. Along the middle 

 of each row of stigmata runs a transverse vessel connected with 

 each of the interstigmatic bars, but not otherwise interrupting 

 the stigmata. A similar arrangement to this occurs in the 

 genus Distaplia. On the dorsal side, but to the left of the 

 middle line, each interserial lamella is produced into a large 

 ciliated languet. Of these the two anterior are placed some- 

 what nearer the middle line than the third. A similar un- 



