66 DISCOVERY REPORTS 



The number of specimens taken by 'Discovery II' or 'Manihine' in the Indian Ocean was small 

 when one remembers that, quantitative considerations apart, at a single station, No. 4600, in the 

 Eastern Tropical Pacific 'Albatross' took fifty-seven complete specimens, as well as innumerable 

 loose cormidia and nectophores. At three stations off the East African Coast, ' Discovery II ' took four 

 small specimens, fifty-six small nectophores and fifty-two bracts, while at six Aqaba stations ' Manihine ' 

 took two very small specimens, three small nectophores and a small bract, as well as seven specimens 

 of what appears to be the little known larvae of this species, and twenty-one loose larval bracts. These 

 bracts are the field-mark of these larvae. They differ considerably in shape from those of A. elegans. 

 Mr Fraser-Brunner, however, took many specimens in the Gulf of Aden as indicated below. 



Material. The following specimens belong to the stage in which the nectophores have a single 

 ('equatorial') lateral, longitudinal ridge: 



' Manihine ' 



'Discovery' Stations: SS 43 (1 nectophore); 288 (2 juv. ex.); 299 (nects); ' Discovery II ' 679 (1 ex. 

 and nects); 689 (1 nect.); 690 (nects and bracts); 693 (part of ex. and cormidia); 694 (nects); 695 (2 ex. 

 and nects); 696 (cormidia and nects); 698 (nects); 704 (nects); 705 (nects); 1372 (cormidia and nects); 

 1373 (1 ex., nects and bracts) ; 1567 (nects and bracts); 1580 (nects); 1581 (1 juv. ex., nects and bracts); 

 1585 (4 juv. ex., cormidia and nects); 1586 (nects and bracts); 1752 (1 ex., no nects); 2648 (nects). 



'Terra Nova' 1910-13 Stations: 45, Atlantic (nectophores); 56, Atlantic (1 nectophore); 311, 

 35 29' S., 51 21' W. (1 nectophore). 



The following specimens belong to the typical adult stage in which there is a second lateral, longi- 

 tudinal ridge on the nectophores : 



'Discovery II' Stations: 1375 (nects and bract); 1576 (1 ex.); 1580 (nects and bracts); 1585 (6 juv. 

 nects); 1747 (1 ex. and cormidia); 1759 (nects and cormidia); 1760 (2 adult ex.); 2681 (6 adult ex.). 



The specimens from Station 1760, where the surface temperature was 21-22° C. are from 5 to 6 cm. 

 in length, and the siphosome consists of from ten to twelve segments. The terminal (? primary) 

 gastrozooid is much smaller than those in the middle region, and has a reduced basigaster. The bracts 

 are arranged in five rows on each side in the middle region and in three rows near the end. 



Numerous specimens with nectophores of the 2-ridge type were taken in Bermuda by Beebe. 



A fine specimen of Agalma okenii (siphosome only) from ' Discovery II ' Station 1752 is nearly 6 cm. 

 in length. Some of the tentilla have as many as sixteen turns of the cnidoband, and the involucre 

 covers from six to nine of them. The first seven turns are larger in diameter, and are flanked by the 

 larger, elongated type of nematocysts, whose threads can penetrate through at least 6 mm. of bracteal 

 jelly. The terminal eight or nine turns, which are not so flanked, are smaller in diameter. In the absence 

 of nectophores this specimen cannot be placed in either of the above groups of specimens, though it 

 is typical of the species. 



'Terra Nova' 19 10-13 Stations: Station 46, 1 specimen possessing buds of nectophores and 

 detached nectophores of the adult (2-ridge) type : 56 (1 nectophore) ; 59 (nectophores) ; 69 (nectophores). 



