Order Liicernaricc. 565 



extend farther at each end ; * the digitiform bodies are 

 arranged as in H. auricula : pedicel muscles oval in a 

 transverse section, situated as in II. auricula : muscles of 

 the disc as in H. auricula ; marginal muscle broad ligulate, 

 naiTowest at the anchors, but gradually widens toward the 

 arms, at the end of which it is very thin : gelatiniform 

 layer very thin at the edge of the disc, but gradually thick- 

 ens toward the pedicel, in which it has the same relations 

 to the muscles and the cameras as in H. auricula, but with 

 different proportions, as may be judged from measurements 

 of the cameras given above : groups of lasso-cells in little 

 depressions or saccules scattered here and there, on the 

 oral side of the disc. Size, nearly one inch across the disc ; 

 pedicel half an inch long. Geographical distribution : 

 " Dredged in 3 fthms on Laminaria, Mt. Desert Is., Maine, 

 August, 1858," Stimpson. 



Haliclystus ocTORADiATUs.f H. James-Clark. 



Lucernaria octoradiata, Sars, (non Lamck.) Skandinav. 



Naturforsch. mode i Kjobnh., 

 1860, p. 693. 

 « " = L. auricula, Bidrag til Sudyr. 



fide Sars, Aftryk af Videns- 

 kabs. Forhand. i Christiana, 

 1860. 



* In individuals of tlie same size belonging to H. auricula there are as many as 

 one hundred saccules in each band; and in H. octoradiatus (Lucernaria octoradi- 

 ata, Sar?, (non Lamck.) Bidrag til Siidyr., 1S29, transl. in Olien's Isis, 1833, p. 228, 

 taf. X. fig. 6) larger individuals have only " 20-30 " saccules, in two rows, in each 

 band. By this feature alone the three species may be promptly recognized. 



t As I do not possess living specimens of this species, I quote from the descrip- 

 tions of Sars, as translated in the Isis, and Keferstein, and in order that the com- 

 parison with the two foregoing species may be as complete as possible, I deem it 

 necessary to give a very full transcript from these autliors, supplying from one 

 what the other does not mention. In order that there may be no misapprehension 

 as to the cliaracter of Sars's animal, I quote Keferstein in ( ), and any suggestions 

 of my own in [ ]. 



