234 CLASS VII. 
the posterior extremity infundibuliform with margin usually denti- 
culate. A membraneous tube covered with fragments of shells, open 
at both ends, including the animal. 
Sp. Clymene amphistoma Sav. Descr. del Egypte, Annél. Pl. 1. fig. 1; GUERIN, 
Iconogr., Annél. Pl. 10, fig. 1, from the Red Sea. See fig. of other species, 
Cov. R. Ani. éd. ill., Annél. Pl. 22. 
B. External organs of respiration. 
= Tubulate. 
Note——The Cephalobranchiate, or tubicolous Epw. Annulata, are 
more imperfect than the roving or notobranchiate. It seems right 
therefore to introduce them here, although the affinity by which 
Arenicola is connected with the Lumbricini points to a different 
arrangement. 
Family VI. Amphitrite Say. Head not distinct, eyes none, 
body usually encased in a tube. 
A, Branchiz anterior, more or less composite, with one, two 
or three pairs. 
Siphonostoma Orro. Two larger tentacles (branchiz ?) and seve- 
ral soft cirri around the mouth. Fasciculi of setee in double pairs 
in every segment; the sete in the anterior segments extremely long, 
directed forwards, glistening with gold. The worm not included in 
a tube. 
Sp. Siphonostoma diplochaitus Orro Nov. Act. Acad. Natur. Curios. Tom. x. 
2, 1821, p. 628, Tab. 51, in the Mediterranean at Naples; other species 
have been described by Minne Epwarps, GRUBE and RATHKE; see 
RatHKE -Beitr. zur Fauna Norwegens, Nov. Act. Acad. Natur. Curios. 
Tom. xX. I, 1843, pp. 211—219, Tab. XI. 
To the same division also appears to belong the worm described by 
ABILDGARD in the Zoolog. danic. Tab. go, as Amphitrite plumosa, but 
which differs from Amphitr. plumosa of O. Fasrictus (fauna grenl. 
p. 288); Oxen formed from it the genus Pherusa!, (Lehrb. d. Zoolog. 1. 
8. 377) : Siphonostoma plumosum RatHKE Beitr, zur vergl. Anat. w. Physiol. 
1842, p. 84, Tab. vi. figs. 1—7, Beitr. zur Fauna Norwegens, p. 208, Tab. 
Xie deplse 2 
1 The name Pherusa was also given by Lamourovx to a genus of the class of 
Polyps, of which the polypary alone is known and to which Flustra tubulosa belongs ; 
Hist. des Polypiers flexibles, 1816, p. 117; G. JoHNSTON formed from Amph. pluwmosa 
the genus Flemingia, from which his genus Trophonia does not differ. Ann. of Nat. 
Hist, XVIL. p. 294. 
i 
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