ACTINIARIA 



Oral part of the siphonoglyphe without a conchula. 10 pairs of mesenteries (6 + 4 lateral and ventro-lateral), 

 all perfect and fertile. Parietal muscles distinctly differentiated from the longitudinal pennons. Spirocysts 

 in the tentacles and the oral disc absent. 



This genus, proposed by Verrill for species of Eloactis with ampullaceous papillae on the column, 

 while the true Eloactis are devoid of such, is nearly related to Peachia and especially to Eloactis. From the 

 latter it is distinguished only through the above-mentioned character. The column of Eloactis has no ampulla- 

 ceous papillae, but is a little otherwise differentiated (compare Eloactis). Attention is called to the fact that 

 I have not found any spirocysts neither in Haloclava nor in Eloactis. 



Although this genus is not represented in the Arctic and Northern seas, nor has been dredged during 

 the Ingolf- Expedition, I have nevertheless added it here for the sake of comparison with Eloactis. The type- 

 specimen was found at the Eastern coast of the United States. 



Haloclava producta (Stimps.) Verr. 

 Actinia producta n. sp. Stimpson, 1856, p. 100. 

 Halcampa producta, Stimps. Verrill, 1862, p. 30, PI. i, figs. 10, n, 1874, p. 330, 738. Andres, 1883, 



p. 318. Me. Murrich, 1891, p. 136, PI. 9, figs. 2, 3. 

 Corynactis albida n. sp.' Agassiz, 1859, P- 2 4- 

 Halcampa albida Agass. Verrill, 1862, p. 29, 1863, p. 57, 1866, p. 338, Andres, 1883, p. 318, Verrill, 



1899, p. 41. 

 Eloactis producta (Stimps.). Me. Murrich, 1893, p. 141 142. Parker, 1900, p. 750, fig. 4. Hargitt, 1914, 



P- 245- 

 Haloclava producta (Stimps.). Verrill, 1899, p. 41, fig. 7. 



Diagnosis: Typical nematocysts in the column 17 22 X 22,5 A*. m tne acrospheres of the ten- 

 tacles 48 106 X 2 p, in the other part of the tentacles 13 17 X 2 p, in the actinopharynx 36 46 X 3,5 ft, 

 and in the acrospheres nematocysts with discernible basal part to the spiral thread 72 98 X 3,5 4 /. 

 Ectodermal longitudinal muscles in the peduncle very strong. longitudinal pennons of the mesenteries in 

 the reproductive region rather strong, in transverse-sections reniform, with few, about 10 very ramificated, 

 high folds, all of about equal length. Outer lamellar part of the mesenteries attached close by the outmost 

 end of the pennons. Parietal muscles rather strong, with somewhat numerous, low but ramificated folds, 

 extended in radial direction (small but high), not expanded upon the column. Marginal stomata present. 



Colour: Column transparent, yellowish-green (Stimpson). Column whitish, shading off into pale sal- 

 mon, the base translucent with a bluish tint. Tentacles with brownish, knob-like tips (Hargitt); var. albida: 

 Column pale brownish-yellow, tentacles paler, the knobs at the tips dark brown (Verrill). 



Dimensions in expansion: length 8 or 10 inches; in contraction: about 3 inches, diameter 0,75 

 inch. (Verrill). The largest preserved specimen, dissected by myself, was 2,5 cm long, largest diameter of 

 the body 0,85 cm, smallest diameter 0,45 cm, length of the tentacles 0,3 cm. 



Occurrence: Eastern coast of the United States from South Carolina to Cape Cod (Verrill), Fort 

 Johnson S. C. Sandy mud, near low-water mark (Stimpson) Woods Hole. Buzzards bay, Catama bay 



'4* 



