236 CLASS vii. 



tubercles supplied with uncinate setae at the dorsal pinna, with a 

 fasciculus of subulate setae at the ventral pinna, The worm included 

 in a gelatinous tube covered with sand. 



Sp. Sabella pavonina SAV. ; Amphitrite penicillus LAM., BASTES, Natuurk. 

 Uitsp. i. p. 88, Tab. ix. fig. i ; Tubularia peniciUus, Zool dan. Tab. 89, figs. 

 i, 2, in the North Sea; Sabella magnifica SAV. ; Tubularia magnifica SHAW 

 Linn. Transact. V. p. 228, Tab. ix. ; Sabella (amphitriie) taurica RATHKE 

 Fauna der Krym, M&m. des Sav. Strangers de VAcad. imp. de Saint- Petersb. 

 Tom. in. 1837, p. 426, Tab. vm. figs. 8 15, &c. 



Serpula L. Mouth situated between the branchiae, not tentacu- 

 late, transverse. Branchise two, large, pectinate, flabellate, with 

 bearded laciniae and a cylindrical filament at the base of different 

 length in each branchia, the longer sustaining an orbicular disc or 

 infundibuliform operculum. Feet as in the preceding genus. 

 Calcareous tube procumbent, twisted or convoluted into a spire, 

 including the animal. 



Sp. Serpula contwtuplicata L., GUERIN Iconogr., Anne"l. PI. i, fig. i, (the 

 animal) ; ELLIS Corallines, Tab. 38, fig. 2 ; Serpula vermicularis L., Zool. 

 danic. Tab. 86, figs. 7 9, &c. 



Comp. on this genus, which is somewhat differently determined and into 

 which Sabella protula Cuv. is also brought, A. PHILIPPI in ERICHSON'S 

 Archiv. 1844, s. 186 198. 



Spi/rorbis LAM. 



Sp. Serpula spirorbis, Spirorbis nautiloides LAM., Zool. danic. Tab. 86, figs. 

 i 6 ; GUERIN Iconogr., Annel. PI. i. fig. 6. 



B. Branchise dorsal numerous. 



Hermella SAV. (Amphitrite Cuv. in part), Sabellaria LAM. 

 First segment of the body supplied on both sides with a triple series 

 of very glistering tufts, the external very patent, the internal close. 

 The rudiments of the feet, in addition to setae, supplied with a 

 cirrus elongate, adhering above to the base, performing the office 

 of branchiae. Animals living gregariously, included in tubules 

 made of sand and fragments of shells, conjoined to form a common 

 honey-combed mass. 



Sp. Hermella alveolata, Sabella alveolata L., ELLIS Corallines, Tab. xxxvi. ; on 

 the English and French coasts. Formerly the bundles of threads beneath 

 the first segment were supposed to be gills. MILNE EDWARDS was the first 

 who indicated the true gills, on account of which this animal belongs to the 



