Actinaria G 123 



swollen basal portion, which is marked by 12 corresponding whitish sulcations, 

 meeting at the end and alternating with some finer lines. Upper part of column 

 is transparent and naked for about 3 or 4 mm. 



Tentacles 12, rather short, in a single circle at the margin of the disk, 

 not crowded, pale yellowish white, sprinkled with fine flakes-white specks which 

 become more crowded on the inner median line and at the tips. Disk small, 

 often protruded; mouth largely dilatable, sometimes elevated on a cone; lips 

 with 12 irregular lobes. Disk and naked space below the tentacles pale yellow- 

 ish white, finely speckled with flake-white, the disk with faint whitish radiating 

 lines. Length, 12-15 mm; diameter, 4-5 mm; of disk, 3-4 mm. The type 

 locality was South bay, near Lubec, Maine, in 8 fathoms, mud, 1872. It was 

 subsequently taken by us in various places in the Bay of Fundy and Casco bay, 

 in 10 to 95 fathoms. 



The fig. 5, as of the disk, pi. VIII, Am. J. Sci., 1874, is not this species. 

 It belongs to H. duodecimcirrata. Andres united the two species and erred 

 in his references. 



Sub-family SIPHONAGTININvE Verrill. New name. 

 Family Siphonactinidce ANDRES, 1884, (emended). 



Halcampidse having one siphonoglyph prolonged into a lobed conchula. 

 capable of being protruded. Posterior end usually provided with a pore. 

 Tentacles usually 12, rarely 8 or 10. Six pairs of perfect strongly muscular 

 mesenteries; often four or more pairs of narrow, imperfect, fertile ones. 



Some of the species are parasitic on jelly-fishes, at least while young; others 

 burrow in the earth. 



Siphonactinia Dan. and Koren. 



Siphonactinia DANIELSSEN AND KOREN, Fauna Litt. Norvegise, ii, p. 88, pi. 



12, figs. 4-6, 1856; Annals and Mag. Natural History, Ser. 2, vol. XVIII, 



p. 219, pi., 1856. 

 Biddium L. AGASSIZ, Proc. Boston Soc. N. Hist., VII, p. 24, 1859. VERRILL, 



Revision of the Polyps of the Eastern Coast of the United States, Memoirs 



of Boston Soc. of Nat. Hist., Vol. I, p. 31, PL 1, figs. 14, 15, 1865. 

 fPeachia (pars) GOSSE, Actinologia Brit., p. 243, 1860 (not of 1855). VERRILL 



(pars), op. cit., 1866, 1873. 



Philomedusa (pars) ANDRES, op. cit., p. 112, 1884; (? not of MULLER, 1860). 

 Biddium McMuRRicn, Proceedings Zool. Soc., London, II, p. 967, 1913. 



Column naked, soft, elongated, in life very changeable in form, often 

 cylindric, or tapering to the aboral end, where there is no disk, but a central 

 contractile pore, often tightly closed in contraction. Both ends are capable of 

 invection. In expansion the oral end is usually the larger. Tentacles 8 or 12, 

 usually 12. Mesenteries usually 12, all perfect, with thick longitudinal muse 

 Circular muscles of the column are mesoglceal, moderately developed, some- 

 what stronger near each end; sphincter little or not at all differentiated. 



Usually there is only one siphonoglyph, which may become tubular by 

 union of its edges, ending in a simple three-lobed conchula, capable of pro- 

 trusion. Surface of column capable of adhesion by means of minute suckers, 

 usually not visible to the naked eye unless in use. 



The genus Siphonactinia Dan. and Koren, 1856, appears to be identical 

 with Biddium Agassiz, 1859. Its conchula is terminated by three simple lob 

 as in the latter. It is represented as much exsert and tubular, but I have seen 



