TUBULARIA HUMILIS. 411 



8. TUBULAKIA SIMPLEX, Aider. 



TuBULARrA SIMPLEX, — AlcJcr, Catal. Suppl., pi. viii, figs. 3, 1. Hincks, Brit. Hydr. Zooph., 



p. 121, pi. .Kxii, fig. 1. 

 TuBULARiA Du.MORTiEui, — JoluistoH, Biit. Zoopli., sccoud edit., p. 50. Alder, in Trans., 



Tynes. Club, vol. iii, p. 106. 



TROPHOSOME. — Hyurocaulus attaining a height of from two to two and a 

 half inches, slender, unbranched, smooth, generally a little bent or geniculated at 

 intervals, and tapering towards the base, usually solitary. Htdranths slender, distal 

 circlet of tentacles bi-serial, shorter and less numerous than in Tuhularia indivisa, 

 the proximal with about twenty or twenty-four moderately long tentacles. 



GONOSOME.— Not observed. 



Colour. — Hydraiith rose colour ; crenosarc orange or scarlet, with the perisarc horn coloiu-. 

 Habitat. — On shells, &c., in the sea. 

 Hathy metrical distribution. — Deep sea zone. 

 Locality. — Coast of Northumberland, Mr. Alder. 



I have never met with this species, which is, doubtless, nearly allied to Tubularia attemiata, 

 and, like it, is a deep-water species. Its unbranched hydrocaulus, however, and the angular 

 flexures of its stem, will ati'ord characters by which it may be distinguished. 



Mr. Alder, who at first referred this species to the Tubularia Dumortieri of Van Beneden, 

 subsequently recognised its distinctness, and described it as a new species. 



9. TuBULAKiA HUMILIS, AUmcin. 

 Plate XXII, figs. 3 and 4. 



TuuuLARiA HUMILIS, — Allinun, ill Ann. Nat. Hist, for July, 18G4-. Hincks, Brit. Hydr. 

 Zooph., p. 123. 



TROPHOSOME. — Hydrocaulus attaining a height of about an inch, sparingly 

 branclied ; perisarc delicate, with nearly obsolete transverse corrugations. Hydraxth 

 supported on an annidar expansion of the coenosurc ; greatest breadth of the basal 



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