174 THE MEDUSAE. 



5. Zi/ffodactylaflava k. Agassiz. Jf^'soHfrnaOTcfonViJofMurbach and Shearer 

 is apparently identical with this species, whose account agrees even in minor 

 particulars with that of A. Agassiz ('65). In this species the number of tenta- 

 cles and canals (about equal) is very large (up to one hundred); and there is 

 a gelatinous peduncle. 



6. Mesonema coerulescens Brandt, which, like Z. groenlandica A. Agassiz, has 

 many more tentacles than canals, and the basal bulbs laterally compressed. 

 It is probable that Mesonema dubia Brandt is a synonym of this form, as 

 Mertens believed (Brandt, '38, p, 362), but the description of M. dubia is not 

 sufficiently detailed for accurate determination. 



7. A. conica Browne is easily distinguishable from any of the preceding 

 species by its short, deep, proximal gonads and by the high conical form of 

 the bell. Tentacles twenty-six to thirty, radial canals about sixteen. The 

 A. abbreviatum. of Eschscholtz has a similar conformation of the gonads, but 

 the description and figures of it are so unsatisfactory that it seems impossi- 

 ble to determine whether or not it is synonymous with Browne's species. 



Finally, one more species has been described by Browne, A. parva, dis- 

 tinguished from all other Aequoridae by having only four developed ten- 

 tacles ; but since Browne himself has suggested (: OS**, p. 146) the possibility 

 that it may eventually develop more tentacles, its status cannot yet be 

 determined. 



Aequorea raacrodactylum Brandt. 



Mesonema macrodactylum Brandt, '38, p. 359, taf. 4 ; Maas, : 05, p. 40, taf. 8, figs. 51", SIK 

 Aequorea maldivensis Browne, : 04, p. 732, pi. 56, tigs. ^.-12. 



Plate 36, Figs. 5-10. 



Station 4667 ; surface ; 1 specimen, fair condition. 

 Station 4668 ; 300 fiithoms to surface ; 1 specimen, good condition. 

 Station 4671 ; 300 fathoms to surface ; 4 specimens. 

 Station 4676 ; 300 fathoms to surface ; 1 fragmentary specimen. 

 Station 4679 ; 300 fathoms to surface ; 1 fair specimen. 

 Station 4683 ; 300 fathoms to surface ; 1 specimen. 

 Station 4685 ; surface ; 1 specimen. 



Station 4728 ; 300 fathoms to surface ; 1 fragmentary specimen. 

 The specimens agree very well with the accounts given by Browne (: 04) 

 and by Maas (: 05) except that the number of radial canals and tentacles is 



