CHLOILEMIDjE. 87 



(a) Eight branchiae, of which four are large and four small, situated behind the 

 mouth and behind the tentacles. 



Trophonia glauca, Malmgren ; Trophonia Mrsuta, Hansen; Stylarioides longisetosa, 

 Marenzeller. 



(/>) Branchiae ? 



Trophonia Kerguelarum, Grube ; Trophonia Wyrillei, Mel. 



(2) Dorsal bristles capillary, ventral forming simple hooks. 



(a) 8—10 branchiae, disposed as in the former group. 



Stylarioides plumosa, 0. F. Miiller (includ. Trophonia arctiea, Hansen? T. borealis, 

 Hansen? and T. ricgosa, Hansen, according to Levinsen). Trophonia ajpnis, Verrill ; 

 Stylarioides tenera, Grube ; Trophonia flabellata, Sars ; Stylarioides ductus, Haswell. 



(b) Brachiae numerous, of equal size, supported by a membranous plate placed 

 vertically behind the tentacles and the mouth. 



Siphonostomum cariboum, Grube (S. cingulalim, Grube and (Ersted) ; Stylarioides 

 rudis, Grube ; Trophonia capensis, Mel. 



(c) Branchiae ? 



Stylarioides scutiger, Ehlers, Florida ? Stylorioides Horslii, Haswell. 



(3) Dorsal bristles capillary, ventral bifid. 



(a) Branchiae arranged in a horse-shoe. 

 Trophonia eruca, Claparede. 



(b) Branchiae numerous. 

 Trophonia arenosa, Webster. 



(4) Dorsal bristles capillary, ventral articulated to a certain extent. Branchiae ? 

 Stylarioides collarifer, Ehlers, Florida. 



(5) Dorsal bristles capillary ; ventral bristles, some capillary or little thickened, the 

 others forming hooks more or less stout. 



Trophonia xanthotricha, Schmarda. 



Mesnil 1 (1899) briefly considers the systematic position of the Flabelligeriens, De St. 

 Joseph (Chloremiens, De Quatrefages), and is inclined to link them on to the genera 

 Macrochdeta, Grube, Acrocirrus, Grube, and Ledon, Webster and Benedict. He relies on 

 the nature of the prostomium with its palpi in the last named, the cylindrical branchiae of 

 the metastomium, the capillary dorsal bristles, and the large compound ventral bristles, 

 the presence of a cardiac body, a pair of anterior nephridia, and the presence of papillae. 

 He thinks, therefore, that they may thus be linked on to the Cirratulidae. Further, he is 

 inclined to consider that they have certain affinities with the Sternaspidae. He, however, 

 does not allude to the absence of those transverse bars in the bristles, a feature so 

 characteristic of the Chloraemidae. 



No British form presents so peculiar a branchial apparatus, for instance, as Coppin- 

 geria, from Port Molle, Queensland, described by Prof. Haswell. 2 In this form the stems 

 of the bifid branchial apparatus have filaments to the number of sixty in each. The 

 author holds that the papillae on the surface are sensory. He devotes considerable 



1 f Zool. Anzeiger/ Bd. xxii, p. 81, 2 text-figs. 



2 'Proc. Linn. Soc. N. S. Wales/ 1892, vol. vi, p. 329, pi. xxvi, figs. 1 — 5, and other forms in 

 pis. xxvii and xxviii. 



