POLYPT. 97 
Fredericilla GERVAIS. 
Sp. Plumatella sultana, Tubularia sultana BuumEns. Handb. d. nat. Hist. 
PL. 1. fig. 9. 
Aleyonella Lam. Polypary incrusting, irregular, multiform, com- 
posed of tubules aggregate, cylindrical. 
Sp. Plumatella fungosa nob., Alcyonella stagnorum LamM., Encyel. méthod. 
Vers. Pl. 472. fig. 3, a, b, c, d, Rasparn Hist. naturelle de  Alcyonelle flu- 
viatile, Mémoires de la Soc. d Hist. nat. de Paris, iv. 1828. pp. 75—139, 
pl. 12—16. To this species probably Baxker’s figure belongs, Hmploy- 
ment for the microscope, Pl. xt. fig. 13—22 (Bell-flower animal). See 
Jounston, Hist. Br. Zooph. pp. 391—395. , 
RasPalIL is of opinion that this animal is merely a form of Plumatella 
campanulata altered by age, from which he does not distinguish Plwmat. 
cristata ; as soon as the animal breaks the egg, it moves freely about, and 
should then be described as Cristatella, so that all of them belong to oneand 
the same species at different periods of life. But amongst other objections 
to the union with Plumatella cristata and campanulata is the number of 
the tentacles which in Alcyonella is, according to RaspatIL, only forty-four 
(according to EHRENBERG forty-two), whilst here, if it were an older state 
of Plumatella campanulata, the number might rather be expected to be 
greater. Also in Cristatella there are more tentacles. However, it is 
possible that Cristatella may be a younger form of another species of 
Plumatella, and so at some future time to be excluded from the list of 
genera. 
PALLAS, as it seems, first discovered the Alcyonella in our country in the 
well-known lake of Rockanje, in the island Voorn, and described it by the 
name of Tubularia fungosa, Nov. Commentar. Acad. Scient. Petropol. x11. 
1768. The name Alcyonella should be rejected, for it was borrowed from 
a supposed resemblance with Aicyoniwm, which on further investigation 
was found to be totally unfounded. 
Van BENEDEN has observed the sexes to be distinct in Alcyonella, male 
and female individuals occurring in the same Polypary. Bullet. de Acad. 
des Sc. de Brux. Tom. vi. 1841. p. 276. 
Paludicella Grrv Als. 
Sp. Alcyonella articulata EHRENB. Symbol.? Comp. VAN BENEDEN Bullet, de 
VPAcad. des Se. de Brucelles vt. 1. 1. 
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