306 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The series of stages outlined above shows that the number of large 

 tentacles remains permanently small; that is, that the great majority 

 of the knobs never develop into tentacles, but remain rudimentary, 

 just as they do in P. palkensis. Both tentacles and knobs bear ex- 

 cretory papillae (pi. 41, fig. 5). 



Manubrium and gonads. — The manubrium is short, perhaps 

 through contraction; the lips complexly folded (pi. 41, fig. 4). The 

 gonads extend from the base of the peduncle nearly to the margin. 



Budding. — One of the most interesting finds of the collection is the 

 specimen of this species, 13 mm. in diameter and abnormal in having 

 five radial canals, with hydroid blastostyles budding from the go- 

 nads, exactly as they do in Phialidum mccradyi Brooks. This is 

 the second known instance among Leptomedusae of this method of 

 asexual reproduction. The process has been described in detail 

 for Phialidium by Sigerfoos (1893), who corrects some errors in 

 the original account by Brooks (1888), and figures of the fully 

 formed blastostyles have been given by the latter and by Mayer 

 (1900, 1910). The photographs of the gonad of P. elliceana (pi. 41, 

 figs. 6, 7) will show how closely the type of budding agrees in the 

 two genera. 



Color. — In the preserved condition the gonads are pale yellowish. 



The present specimens agree so closely with the original specimen 

 of elliceana in the structure and arrangement of marginal organs, 

 as well as in general form, as noted above, that I have no hesitation 

 in uniting them with it. The combination of comparatively few 

 large tentacles with many permanently rudimentary knobs separates 

 it from all species of Phortis except palkensis. Palkensis, when of 

 the same size, has many more tentacles according to the account by 

 Browne (1905) ; according to Vanhoffen (1911) at least twice as many. 

 So long as we have only the data afforded by so few specimens both 

 species may be retained. Should future investigation prove that 

 the two extremes be within the range of normal variation of a single 

 species, which is possible, though I think not probable, the name 

 elliceana would prevail on the ground of priority. 



Genus OCTOCANNA Haeckel, 1879. 

 ETJCOPIDAE with eight radial canals. 



Vanhoffen (1912) has recently maintained that the various octo- 

 radial eucopids (" Octocanna") described by recent authors (Browne 

 1905, Maas 1905, 1911; Bigelow 1909a, Vanhoffen 1911) are really 

 mere variants of the tetraradial typo,. This is probably true in the case 

 of the octoradial variety of Phialucium mbengha. But there are at 

 least two " octocannas " which can not yet be referred to any known 

 eucopid with four canals. One of these is the globular form, from 



