404 MEDUSAE OP THE WORLD. 



mature with 4, but occasionally develops 8 lithocysts, and that A. "rosea" is only a phase in 

 the growth of the medusa. 



The figures of A. camtschatica of the North Pacific given by Mertens (Brandt) and by A. 

 Agassiz show that this medusa is probably identical with A. digitale of the North Atlantic. 

 Their drawings show a much shorter peduncle than is seen in the adult, A. digitale of the 

 Atlantic, but their specimens appear to have been of smaller size and were possibly not fully 

 grown, although with well-developed gonads. A. Agassiz's, 1865, figures illustrate these 

 points very clearly. At most the North Pacific medusa appears to me to be but a close variety 



of A. digitale. 



Aglantha digitale var. "occidentals " Maas. 



Aglantha occidentalis, n. sp. oder A. digitalis var. occidental!!, Maas, 1893, Ergeb. der Plankton Exped., Bd. 2, K. c, p. 24. 



In this variety, according to Maas, the bell is not as high as in Aglantha digitale, but is 

 more than twice as broad. The bell attains a height of 15 to 20 mm. The gonads make their 

 appearance when the bell-height is only 6 mm., whereas in the typical Aglantha digitale the 

 bell is more than 15 mm. high before the gonads are seen. This variety was found by the 

 Plankton Expedition in the West Greenland Stream and on the Newfoundland Banks in July 



and August. 



Aglantha digitale var. intermedia Bigelow. 



Aglantha digitale var. intermedia, Bigelow, H. B., 1909, Mem. Mus. Comparative Zool. at Harvard College, vol. 37, p. 112, 

 plate 29, figs. 4-10. 



Bell 14 mm. wide, 15 mm. high. 80 to 90 tentacles. The 8 radial-canals do not pro- 

 ceed straight down the peduncle as in A . digitale but are arranged in 4 pairs each of which 

 bends in an 2S-like manner. The gonads do not begin to develop until the medusa is about 5 

 mm. high. This variety is larger than A. digitale and has more tentacles. Described by 

 Bigelow from the eastern tropical Pacific between 13 S. and 20 N. lat. in the interme- 

 diate fauna between 400 fathoms and the surface. 36 specimens were collected by the 

 Albatross expedition of 1904-05. 



Aglantha globuligera Haeckel. 

 Aglantha globuligera Haeckel, 1879, Syst. der Medusen, p. 272, taf. 16, fig. 8. 



This species is said to be distinguished by its small size, pyriform, rounded bell, spherical 

 gonads, and by having not more than 32 tentacles. Bell pyriform with bluntly-rounded apex 

 and barrel-shaped sides, 2 mm. high, 2 mm. wide. The gelatinous substance thick at apex 

 but quite thin at sides. 32 tentacles with club-shaped, swollen ends, the longest not quite as 

 long as bell-diameter. 4 interradial sensory-clubs. Velum well developed. Peduncle conical, 

 about one-fourth as long as bell-height and about as wide at base as bell-radius. Stomach 

 urn-shaped, as long as peduncle; 4 large, recurved lips as long as stomach. 8 spherical gonads 

 are situated upon the 8 radial-canals at points of juncture of peduncle with subumbrella; the 

 diameter of each gonad is equal to length of peduncle. Medusa colorless. Found in the Canary 

 Islands, in February. (See fig. 254.) j 



Aglantha elongata. 



Circe elongata, Lesson, 1843, Hist. Zooph. Acal., p. 286, plate 5, fig. 2. 



Aglisrra elata+ A . elongata, Hafckel, 1879, Syst. der Medusen, pp. 276, 277, taf. 16, fig. 2.— Maas, 1904, Result. Camp. So. 



Prince de Monaco, fasc. 28, p. 30. 

 ( ?) Circe invertens, Allman, 1873, Nature, London, vol. 9, p. 74. 



This species is distinguished by its narrow, elongate bell and by the fact that the 8 gonads 

 arise from the sides of the subumbrella, not from the base of the peduncle as in A. digitale. 

 Moreover, there are 16 sensory-clubs instead of 4 to 8 as in A. digitale. 



The bell is 3 to 4 mm. wide, 10 to 12 mm. high with cylindrical sides and conical apex. 

 About 50 or more marginal tentacles, 16 lithocysts, 2 in each octant. Peduncle cylindrical, 

 half as long as bell-height. Stomach very small, only one-eighth as long as peduncle; 4 trian- 

 gular lips as long as stomach. 8 sausage-shaped gonads are suspended from the middle points 

 of the 8 radial-canals on the subumbrella ; gonads are each about as long as peduncle. Medusa 

 rose-colored. (See fig. 255O 



Haeckel describes this medusa from the Cape of Good Hope, Africa, and Maas records 

 it from the Bay of Biscay, and from the Guinea Stream, off the west coast of Africa. 



