Order Lucernarice. - 555 



corners of the mouth, twice as deep as those alternate with 

 them : the pedicel slender, tapering toward the base, about 

 as long as the semidiameter of the disc ; the pedicellar 

 camera circular, and subdivided into four lateral spaces by 

 the four large muscular pilasters, opens broadly into the 

 cavity of the disc : tentacles 100-120 on each arm in adult, 

 in half-grown individuals as many as fifty, very slender : 

 genital bands linear lanceolate ; the proximal ends come 

 close down to the top of the pilaster-like muscles of the 

 pedicel, but do not approximate each other ; their distal 

 ends terminate between the middle and the edge of the 

 arm, next the greater marginal sinus, and close up to the 

 base of the tentacles; the genital saccules are very numer- 

 ous, about as large as those of Haliclystus auricula ; they 

 are largest at the proximal end, and gradually diminish to- 

 ward the distal end ; digitiform bodies larger than the ten- 

 tacles, at the proximal end of the double rows, but grad- 

 ually diminish until at the distal end of the rows they are 

 only one fifth as long ; they extend only one third the 

 length of the genital bands from the proximal end of the 

 latter, distally : the four pilaster-like pedicel muscles about 

 one fifth the diameter of the pedicel, circular, attached by 

 a narrow strip along the face of the camera : the muscles 

 of the disc narrow ligulate, each one terminating at the 

 middle of the end of an arm ; marginal muscle thick and 

 narrow ligulate : gelatiniform layer hardly perceptible in 

 the disc, but in the pedicel about one third as thick as the 

 diameter of a muscular pilaster. Size, 2" broad, 2''- 

 2^" long, Sars ; " nearly three inches in length," Stimpson. 

 Geographical distribution : Denmark, O. F. Miiller, Steen- 

 strup ; Coast of Norway, 2 ft.-20 fthms, Sars ; * Zetland, 



* While the above was in press, I received a full-grown Norwegian specimen from 

 Sars, by means of which I am enabled to add somewhat to the proofs. I find it is 

 identical with one which Mr. Stimpson received from Greenland, through Steen- 

 strup, and also the same as one, three inches high, which the former found at Grand 

 Manan. 



