SPHAROSYLLIS BULBOSA. 451 
1915. Spherosyllis erinaceus, Allen. Journ. M. B. A., N.s., vol. x, p. 597. 
1918. 5 mA Mesnil and Caullery. Bull. Soc. Zool. France, xl, p. 36. 
1920. 3 3 Haswell. Journ. Linn. Soc., vol. xxxiy, p. 224. 
192). “ rf McIntosh. Ann. Nat. Hist., ser. 9, vol. viii, p. 302. 
De St. Joseph found a single ripe female 1-40 mm. long at Dinard at the depth of 26 
métres. ‘There were twenty-two setigerous segments. The median tentacle arises in a 
line with the posterior eyes. A single pair of tentacles occurs on the achetous segment fused 
with the head. The eyes agreed with the type, and so with the dorsal and anal cirri. No 
dorsal cirri on the second setigerous segment. The bristles, which in the ordinary form 
have the structure represented in Plate CX X XV, figs. 6 and 6a, have long tips, with a simple 
extremity, long and pectinate. At the seventh segment is a simple dorsal bristle. Seventeen 
rows of points (“‘pounts gris”) occur on the proventriculus; stomach with lateral pouches. 
From the ninth to the eighteenth segment four eggs in each, but no swimming-bristles. He 
doubts if the form of Langerhans 1s the same, since it differs in the palps, which are higher, 
and in the position of the tooth in the pharynx, which is in the middle. Moreover, the 
bristles differ i structure, though it must-be said that neither is drawn with sufficient 
detail. The number of eggs in each segment also differs. There is perhaps room for doubt 
as to the separation of some of these minute forms—even though they are apparently mature. 
Recently MM. Caullery and Mesnil! have found at the Hogue a species of Rhopalocera 
in this form. 
SPHHROSYLLIS BULBOSA, Southern, 1914. Plate CXXXV, figs. 7 and 7a—bristles. 
Specific Characters.—Head oblong, with rounded corners ; eyes four, large, with lenses ; 
tentacles, tentacular cirri and dorsal cirri as in S. hystrix. Palps long and broad, fused, 
with a famt dorsal furrow, but a conspicuous ventral groove. Nuchal organs in lateral 
region between head and peristomium. Body 5—6 mm. long, and having forty-eight seti- 
gerous segments, widest in the anterior third and tapering toward each end. No papille 
on body, except on the feet and anal segment, which has two cylindrical cirri, with slightly 
swollen bases. Bristles with short terminal pieces; dorsally a single stout spine curved 
and sloped at the tip. Compound setz few (four in each as a rule), spmes stout with a bulbous 
tip and a small process at the end (thus differmg from S. hystrix). Proboscis has a bluntly 
rounded tooth in front and a crown of soft papille ; proventriculus has fourteen rows of 
points. 
SYNONYMS. 
1914. Spherosyllis bulbosa, Southern. Proc. Roy. Ivish Acad., vol. xxxi, No. 47, p. 20, pls. 1 and n, 
G. 
figs. 2 A 
1920. i 3 McIntosh. Ann. Nat. Hist., ser. 9, vol. vin, p. 303. 
Habitat—Dredged in numbers in Clew Bay in 24—27 fathoms, and other parts on the 
West Coast of Ireland (Southern). 
This species is distinguished by the absence of papillee on the body, the short terminal 
1 «Bull. Soc. Zool. France, 1918. 
227 
