ClTiETOrODA. 
495 
develope their sexual products, aud die, and this is also successively the 
case with the stem-individuals of the secondary, tertiary, etc., chains ; on 
the other hand, the three posterior zooids of the quadruple chain never 
will {Chmtog. diaphanus excepted) produce heads, the limits between them 
and between the first and the stem-individual are obliterated, &c. 
A note by J. H. Emerton (Bull. Essex Inst. 1873, pp. 12-13) contains 
some very elementary observations on the worms of the genus Nais. 
H. Ludwig, Ueber die Eibildung im Thierreich, Verb. Ges. Wiirzb. 
(n.f.) vii. pp. 33-256, pis. i.-iii. (Arb. Inst. Wiirzb. i. pp. 287-510, pis. 
xiii.-xv.), discusses the formation of the eggs in the Platylidminilia^ pp. 
49-67, Nematoda^ pp. 66-78, Ecliinorhynchi^ Gephyrea, &c., pp. 79-87, 
Rotatoria, pp. 87-89, Chmtopoda and Discophora, pp. 91-111. 
Genera and Species. 
Chloeia ceylonica, sp. n., Grube (7), p. 236. 
ITarviothoe macleodi, sp. n., McIntosh., Ann. N. II. (4) xiv. p. 193; 
llermadion assimile, sp. n., id. 1. c. p. 194. 
Malmgrenia andreapoUs, id. 1. c. p. 195, St. Andrews, wJiiteavesi, id. 
(10) p. 263, pi. ix. figs. 5-7, Gulf of St. Lawrence, g. & spp. nn. 
Lcetmonice hinhergi (Bd.), Ehlers (2), p. 31, pi. ii. figs. 1 & 2. 
Lagisca rarispina, Sars, var. occidentalis, McIntosh, 1. c., p. 262, pi. ix. 
figs. 1-4. 
Antinoe sarsi (Kinb.), id. ibid. ; Ehlers (2), p. 33, pi. ii. figs. 3 & 4 ; 
Heuglin, 1. c. pp. 238-241. Specimens from the Baltic and Kattegat 
compared ; Malm (9). 
Eupolynoe occidentalis, p. 264, pi. ix. figs. 9-13, anticost iensis, p. 
pi. X. figs. 1-4 ; McIntosh (10), spp. nn. 
Neinidia (?) canadensis, p. 265, pi. x. figs. 5-8, laurencii, p. 266, pi. x. 
figs. 9-11, id. 1. c., spp. nn. 
Polynoe gaspccensis, sp. n., id. 1. c. p. 267, pis. ix. figs. 14 & 15, x. figs. 12 
& 13 ; P. lamprophthalma, sp. n., Marenzeller (11), p. 408, pi. i. fig. 1 [= 
Lepidasihenia elegans, Gr.], reticulata, Cl., id. 1. c., p. 412, crassipalpa, 
sp. n., id. ibid., pi. ii. fig. 1, scolopendrina, Sav. {variegata, Gr., Kr.), id. 
I c., p. Aid, Johns tojii, sp. n., id. 1. c., p. 420. 
Achcloe astcricola (Ch.), Marenzeller (12), p. 420. 
Leanira hystricis, sp. n., Ehlers (1), p. 292, (2) p. 35, pi. ii. figs. 5-11 ; 
sp. n., near L. yhleni (Mgrn.), McIntosh (10), p. 268, pi. x. fig. 14, L. tetra- 
gona (Orst.), id. ibid. 
Enipo gracilis, sp. n., Verrill, Am. J. Sci. (3) vii. p. 407, pi. vi. fig. 4 ; 
P: Am. Ass. 1873, p. 378, pi. v. fig. 3. 
Nephthys pansa, sp. n., Ehlers (1), p. 293, (2) p. 40, pi. iii. figs. 1 & 2, 
johnstoni, sp. n., id. (1) p. 293, (2) p. 38, pi. iii. figs. 3-7 (= longisetosa, 
Johnst. ?) ; N. ingens, Stimpson, P. Am. Ass. 1. c. pi. ii. fig. 1 ; N. 
cmarginata, p. 77, pi. i. fig. 1, paradoxa, p. 79, pi. i. fig. 2, Malm (9), 
spp. nn. 
Eulalia tripunctata, sp. n., McIntosh^ Ann. N. H. (4) xiv. p. 197 ; E. 
imbricata, sp. n., Ehlers (1), p. 294, (2) p. 43, pi. ii. fig. 15 ; E. pistacia, 
sp. n., Verrill, Am. J. Sci. vii. pi. v. fig. 2, P. Am. Ass. 1873, p. 380, pi. iv. 
