542 
VEEMES. 
minate in the branchial ganglion, in the hindmost section of the body. 
Besides a coat of circular muscles, there are 4 longitudinal bands and 
special muscles for the proboscis, the intestine, the oviduct and the gills. 
The eggs are formed in the connective tissue (germs and yelk separately), 
and further developed in the uterine portion of the oviduct, which pro- 
bably opens in the proboscis. 
Selenka (3) describes the first stages in the evolution of Phascolo- 
soma elongatum^ pointing out their general agreement with those of 
Chaetopodous Annelids. The elongate larva is provided with a double 
(pras-oral and post-oral) vibratile ring, 2 (afterwards 3) pairs of bristles; 
2 red eye-specks on the cephalic lobe, &c. The first row of booklets of 
the trunk is also formed at this early stage. 
H. 0. SORBY, “ On the colouring matter of Bonellia viridis^* Q. J. 
Micr. Sci. xv. pp. 166-172. 
Genera and Species, Distribution, &c. 
Koren & Danielssen , (2) distinguish the following species of 
Phascolosoma from Norway ; — P. loveni, sp. n. (Bergensfjord, 50 fath.) ; 
squamatum^ sp. n.) = olivaceum^ S., pt.) (Hardangerfjord, Korsfjord, 
100-300 fath.) ; ahyssorum.^ sp. n., (Bergensfjord, in Lima shells, exca- 
vated by sponges, 200-300 fath.) ; pallidum, sp. n. (Bergensfjord, 200 fath. 
in the tube of Amphictene auricoma) ; eremita, S. (boreale, Kef.) ; 
margaritaceum, S. (cerstedi, Kef.) ; harveyi, Forb. (margaritaceum, Kef., 
nec Sars, Sip. obscurus, Qu.) ; papillosum, Forb. ; vulgare, Blv. {elongatum. 
Kef.), and sirombi, Mont. The identity of P. vulgare and elongatum is 
also advocated by Mobius (Bericht &c. p. 156), who states the occur- 
rence of P. minutum. Kef., at Lindesnaes (Norway), and describes P. 
procerum, sp. n. (Z. c. p. 157, pi. iii. figs. 1-5), from the Bass Rock. P. 
sZromfei is made the type of a separate genus by Th6el (4 & 5) : Phasco- 
lion, “ Digestive tube not spiral, making only 2 convolutions, fixed to 
the body-wall through numerous radiating muscles ; 2 retractors, dorsal 
and ventral ; 1 segmental organ.” According to a note by Gervais, 
J. Zool. iv. p. 379, Cuvier's Lithodermus (L. cinereus, C. ; L. pustulosus, 
Gerv., from the Mediterranean) is closely allied to or hardly different 
from Phascolion. 2 new species are added : Phascolion tuberculosum, 
Theel (5), p^ 15, pi. i. fig. 1, pi. iii. fig. 16, and p. 383, pi. xiv. fig. 1 (Kos- 
terfjord, Sweden, 25-35 metres), and P. spetsbergense, id. 1. c. p. 16, 
pi. 1, figs. 2 & 3, and p. 385, pi. xiv. fig. 10. [Some species of Phasco- 
losoma described by Koren & Danielssen have also but one seg- 
mental organ, e. g., P. pallidum, perhaps identical with Phascolion 
tuberculosum ; Phascolosoma squamatum, moreover, has but a single 
retractor.] Th^el (5) further describes and figures Phascolosoma 
luteum, sp. n., p. 5, pis. ii. fig. 7, and iii. fig. 17, and p. 369, fig. 5 (= 
margaritaceum, Kef., ?) (Gullmaren, Sweden) ; dubium, sp. n., p. 6, 
pis. ii. fig. 8, and iii. fig. 19, and p. 370, fig. 7 (Gullmaren, Vaderoarne) ; 
validum, sp. n., p. 7, pis. i. fig. 5, iii. fig. 18, and iv. fig. 20, and p, 371, 
fig. 4 (Gullmaren( ; albidum, sp. n., p. 8, pi. ii. fig. 10, and p. 372, fig. 6 
(Finmark) ; fulgens, sp. n., ibid. pi. ii. fig. 11, and p. 373, fig. 8 (Green= 
