Order Lucernaricc. 543 



The urn much deeper than broad, passes into the 

 pedicel abruptly from a rounded base ; the arms about as 

 broad as long, recurved : pedicel much longer than the urn, 

 slender, gradually tapering to the end, where it suddenly 

 expands into a moderate disciform base ; the camera four 

 sided, it occupies the middle half of the diameter of the 

 pedicel, opens broadly into the cavity of the disc, and 

 gradually tapers, in the same proportion as the pedicel, 

 until at the base it abruptly expands with the latter : ten- 

 tacles thirty-six, (60 et ultra, Fabr,,*) in each group, the 

 taxis and the rate of radial and transverse development 

 the same as in Halimocyathus platypus ; the globose knob 

 distinct from the moderately slender shaft ; the thickening 

 of the pistilliform tentacles near the base of the shaft, on 

 the distal third of the circumference : the marginal anchors 

 have the same form as the pistilliform tentacles, but they 

 are a little smaller than the latter : genital bands f twelve 

 or fourteen times transversely folded, broadly ligulate, 

 gradually narrowed at the proximal end to one half the 

 breadth of the distal and middle portion ; the digitiform 

 bodies in a single row extend across the proximal junction 

 of the bands and along three quarters of their length ; the 

 membrane of the genital claustrum, thin but not filmy : 

 the muscles of the pedicel close to the inner wall, trans- 



* Fabricius' specimens, at least some of them, were larger than those to which 

 I have access, but I have drawn up the description from the latter, and added one 

 or two sentences from Fabricius in such cases as when his diagnosis difiers from 

 mine. [Since writing the above I have examined Greenland specimens, as large 

 as Fabricius', which Mr. Stimpson received from Steenstrup, and I find them iden- 

 tical with the Grand jNIanan ones in every particular.] 



t Kathke and those who have followed him in identifying this Lncernarian with 

 his Lucernaria auricula, have overlooked the statement of Fabricius in regard to 

 the genitals, (intestines he calls them,) which is, " De ventriculo in singulum par 

 tuberculorum prodit intestinum nigrum 2 — plicatum spirale, versus tubercula 

 integrum, versus collum vero aperturis 2 terminatum," a feature which dis- 

 tinguishes this family from that to which Rathke's L. auricula belongs, in which 

 the diagnosis should be, in singulum tuberculum prodit intestinum simplex, using 

 the same terms as Fabricius. 



