SCTLL-fiA. 05 



veil on the head. M. Rang has observed that the gills 

 spontaneously fall off when touched, and a similar circum- 

 stance occurs with regard to those of Doto and Janus. 



Genus DENDRONOTUS, Alder and Hancock. 



Teeth, central 1, lateral 10 10. Tentacles clavate, lami- 

 nated ; front of head with branched appendages. Gills 

 ramose, arranged in a single series down each side of the 

 back. 



St///. Amphitrite, Asca//., not Midler or Be Haan. 

 Amphitritidia, Kroyer. 



Ex. D. arborescens, Guvier, pi. 64, fig-. 7. 



The sheaths of the tentacles are furnished with branched 

 appendages, and the branchial lobes are arborescent ; the 

 foot is narrow and linear, and the animals are found creeping 

 upon corallines in the laminarian and coralline zones. 



Genus SCYLLiEA, Linnaeus. 



Body compressed. Teeth, central 1, lateral 24 24. 

 Tentacles clavate, laminated, retractile within ample sheaths; 

 veil rudimentary. Gills in small ramose tufts on the inner 

 surface of two wing-like lobes on each side of the back. 

 Foot linear, grooved. 



Ex. S. fulva, A. Adams, pi. 04, fig. 8. 



The gizzard in this genus is armed, and the tentacular 

 sheaths are very large, nearly concealing the tentacles ; the 

 species are oceanic, liviDg on floating sea-weeds, the stems 

 of which they firmly clasp with their linear, grooved foot. 



