450 SPHAROSYLLIS ERINACEUS. 
swimmineg-bristles and sperms, whereas the females are devoid of swimming-bristles, and 
carry two eggs ventrally on segments 10--26. But he has also met with one devoid of 
swimming-bristles carrying embryos on the dorsum from the tenth to the fifteenth segment 
(six segments). Usually they are fixed by their anal segment to the ventral surface of the 
parent, near the ventral cirrus, and so placed that their dorsal surfaces are in keeping with 
that of the mother. They have four eyes in a line, three tentacles, four tentacular cirri 
on the buccal segment, rudiments of proboscis and proventriculus, whilst a mass of orange 
yolk occupies the position of the intestine. There are four setigerous segments and the anal 
has two small cirri. The dorsal cirri have the truncated form of the adult, but contain no 
bacillary bodies, and they are absent from the second setigerous segment, thus differing 
from the adult. The minute ventral cirri are present on four segments. The palpi, longer 
than the head, are less attenuate in front than in the adult. He further notes, as a distinc- 
tion between this species and G. clavata, that the embryos are developed in eggs on the 
dorsum of the parent, whence they escape when sufficiently advanced ; whergas in G. pusilla 
they are developed on the ventral surface of the mother, to which they remain adherent 
after leaving the egg. He adds a caution, however, that possibly variations occur in both. 
Prof. Haswell has found a hermaphrodite condition of the species in Australia (Port 
Jackson), for one or two male segments are followed by a number of female ones, thus 
resembling such Serpulids as Falograna. In G. quadrioculata he found the ova attached 
dorsally between the cirrus and the foot. Mr. Southern met with a mature male in March, 
whilst specimens with embryos attached occurred in May. 
SPHAROSYLLIS ERINACEUS, Claparcde, 1863. Plate CXXXYV, figs. 6 and 6a—bristles. 
Specific Characters.—Head comparatively large, fused with the buccal segment, and with 
large connate palps. Median tentacle behind the transverse lie of the four large eyes 
with lenses, whilst in front are two ocular specks, the three forming a triangle on each side. 
A pair of tentacles indicate the fused first segment. Palpi short and adpressed. Median 
and lateral tentacles with enlarged bases. Body 1°40 mm. to 2 mm. long, colourless, and 
composed of about twenty-two bristled segments, the surface covered with numerous papille. 
The dorsal cirri are enlarged at the base and pointed distally, and the anal cirri have a 
similar shape (Allen), though De St. Joseph states they are not enlarged at the base. 
Pharynx with a tooth in front ; proventriculus with seventeen rows of points, and a stomach 
with small lateral pouches. Posterior end short, more tapered than the anterior. Dorsal 
bristles simple, curved, slightly hooked at the tip. Ventral bristles with longer terminal 
pieces than in S. hystrix. Capillary bristles commence on the eighth and occur on eleven 
segments. A simple curved bristle present in all the feet. Terminal pieces of the bristles 
longer than in S. hystrix. Spines blunt or slightly enlarged at the tip, but not curved as in 
the bristles (Southern). our ova on each segment, from the ninth to the eighteenth. 
SYNONYMS. 
1863. Spherosyllis erinaceus, Claparede. Beobach., p. 45, Taf. xin, fig. 38. 
1886. s 55 De St. Joseph. Ann. Sc. nat., 7° ser., t. 1, p. 207, pl. x, figs. 81—83. 
1914. 5 3 Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 20. 
