SYSTEMATIC AND BIOLOGICAL ACCOUNT 69 



I have re-examined Browne's ' Sealark ' specimens from Mauritius and Farquhar (he did not keep 

 them apart). They are well preserved and show stages of development a little later than those of the 

 Aqaba ones. Two are post-larvae in the monogastric stage, one still bearing a larval bract, and the other 

 one three larval bracts. They are about 3 mm. in length. A third specimen is 10 mm. in length, and 

 two others about 18 mm. These last two have gastrozooids, and one has lost at least seven nectophores. 

 All bear buds of nectophores, and two of them large ones. A sixth specimen is a single cormidium 

 to which is attached three bracts. The largest of these is of adult type, o-8 mm. broad, with four primary 

 facets and two outer secondary ones. 



The larva of A. okenii differs from that of A. elegans in having none of the simple, larval type of 

 tentilla, so well known in Nanomia bijuga. The explanation of this is that this simple type of tentillum 

 in Agalma elegans is borne by the tentacle of a reduced type of gastrozooid intermediate in type 

 between an ordinary gastrozooid and a palpon, and that there is no gastrozooid of this type accom- 

 panying the normal, terminal gastrozooid in A. okenii. The larval bract of A. okenii is comparable with 

 that of A. elegans, but its proximal end makes an angle with the distal one. In A. elegans six or seven 

 bracts of this larval type, much enlarged, may still be attached to the terminal cormidium when the 

 specimen has reached a length of 7 cm. 



Cordagalma cordiformis Totton, 1932. 



This must be the smallest of all Physonects, and it has been overlooked by everyone. I described 

 it first in 1932 from the Great Barrier Reef of Australia. I have found it in daylight close to the 

 surface in the West Indies, and on many occasions at Villefranche, and am now able to report its 

 presence at sixteen of the 'Manihine' Aqaba Stations and at 'Discovery II' Stations 1581 and 1583 

 (see Tables A and B on p. 68). It was not taken by ' Mabahiss '. 



My figure, published in 1932, will serve to identify the nectophores of this very obscure species, 

 about which we know so little at present. 



Measurements. A nectophore was taken at random from the catch made by 'Manihine ' Station 18. 

 Its length is 2-0 mm., breadth 1-2 mm., and thickness i-i mm. measured dorso-ventrally. The other 

 nectophores are of similar size. 



Bargmannia elongata gen.n., sp.n. 1 



This species has long been known to me by its very characteristic nectophores, and since they 

 are very unlike those of species of known genera, I have made this species the type of a new 

 genus. 



Two views of a nectophore of this species from 'Discovery II' Station 681, which I had already 

 prepared, are now published for the identification of this very characteristic nectophore, but no 

 description will be attempted, beyond saying that the lateral canals do not form loops as they do 

 so commonly. In this respect it resembles Kramp's (1942) ' Stephanomia' orthocanna and related 

 species. 



Distribution: 'Discovery' Stations 107, 'Discovery II' 681, 686, 698, 699, 701, 1554, 1585, 1586, 

 1587, 1589, 1769, 2061. 



Holotype (Text-fig. 28 D) and eighteen paratype nectophores Brit. Mus. (Nat. Hist.) Register 

 No. 1952. 11. 19. 7-25 from 'Discovery II' Station 699, 370-0 m. 



I have found a single nectophore in a tube of material submitted by Dr Leloup from ' Michael Sars ' 

 Expedition Station 58 (12-13 January 1910, 37 37' N., 29 25' W.). 



1 Named for Dr Helene Bargmann. 



