ANNELIDA. 
723 
* One operculum. 
a,. Tube free 18. Ditrupa. 
/3. Tube attached. 
a. Branchiae with a circular base. 
1. Operculum corneous 19. Serpnla. 
2. Operculum corneo-calcareous .... 20. Vermilia. 
h. Branchiae with a spiral base 21. Cymospira. 
Genera incertvE sedis 5 : SjnrnjncUa, Ajwmatm, Spiroglyplia, 
Stoa, Venniculum, 
Aphroditea. 
Dr. Baird, in tlie first part of his Monograph of the Aphro^ 
ditacea (Journ. Linn. Soc. viii. jip. 172-202), in which he fol- 
lows the arrangement of Kinberg, describes the following new 
genera and species : — 
Tliormora^ Baird (p. 199). Bases of the antennae produced from the 
anterior margin of the cephalic lobe ; elytra 12 pairs, not covering the middle 
of the back, and leaving the posterior segments of the bod}^ naked, setae of 
dorsal branch of feet of two kinds ; body elongated. T. jukesii (p. 199). 
Nosepca, Baird (p. 200). Head three-lobed, tentacle attached to the 
margin of the centre lobe ; palpi attached to the side lobes ; no antennae ; 
e^dra 14 pairs, covering the back entirely ; body short. N. peronea— 
Polynoe peronea^ Schmarda. 
Aphrodita austraUs (p. 176), Australian seas ; Hermione chrysocoma 
(p. 178), South of Europe, perhaps IlalitJiea auratn of Ilisso ; Lcptmatonicc 
Jdnheryi (p. 180), the Shetland Islands ; Lepidonotus sinclairi (p. 184), New 
Zealand ; L. oculatus (p. 185), Australia ; L. stellatm (p. 185), Australia ; 
L. hoiccrhanldi (p. 185), Australia; liarmotlide unicolor (p. 196), Vancouver 
Island ; Ilermadion ferox (p. 197), dredged from a depth of 300 fathoms in 
lat. S. 74^°, long. E. 175|°; H. ftdigineum (p. 198), taken with the last species. 
Holosydna. The following species are redescribed from more perfect spe- 
cimens : — H. insignis, Baird (p. 188), H. gruheij Baird (p. 189), II. lordii^ 
Baird (p. 190), II. fragilis, Baird (p. 191). 
Br. Johnston (/. c.) describes Lepidonotus {Antinoe) pharetratus (p. 113), 
X. {A^ scmisculptus^ Leach, MS. (p. 116), X. pellucidus, Byster, MS. (p. 117), 
PJdoe- eximia, Byster, MS. (p. 122). 
Br. Baird describes a variety of Lepidonotus cirratus, found living parasitic 
in the lobes of Chcetopterm insignis, Baird ; it differs from the type in being 
much broader, in being at the anterior extremity narrower than at the pos- 
terior, and in tlio cirri not being swollen or enlarged a little beloAV the apex. 
Jourji. liinn. Soc. viii. 1805, p. 161. 
Dr. Malmgren ((Efvcrs. Vet. Ak. Fork. 1865, p. 56) proposes 
tlie following arrangement of the genera of nortliern Polynoida : — 
I. Corpus ovato-oblongum vel lineare, hand auguste elongatum. Elytra 
paria 12-18, totum dorsum omnino aut maxima parte tegentia. Seg- 
menta pauciora quam 45. 
A. iVntennse sub basi tentaculi orientes, incisuram lobi cephalici occupante. 
1. Elytra paria 15 (13-15). 
3 A 2 
