DIPHYES BOJANI. ' 251 



the nectosac, lies obliquely to the right of the main axis of the nectophore (Plate 8, 

 fig. 2), it is not twisted itself. The very muscular nectosac shows a tortion 

 corresponding to that of the nectophore as a whole. In none of the specimens 

 was the subumbrella in good enough condition for me to trace the canals. 



Stevi and appendages. In two specimens the stem bore a very small bud 

 which was apparently the forerunner of a posterior nectophore. It is the pres- 

 ence of these buds which has caused me to refer the species to the Diphyidae 

 rather than to the Sphaeronectidae. The stalk is much contracted in all the 

 specimens, but in a few the groups of appendages are sufficiently loose for study. 

 In these (Plate 11, fig. 4), there is, in addition to siphon, tentacle, and bract 

 a single large bud, so far advanced as to be easily identified as the future gono- 

 phore. 



In view of the conditions in Diphyopsis dispar (p. 258), where the special 

 nectophores first appear at a late stage in development, at least in some individ- 

 uals, it is possible that such organs might be developed later, in spiralis. Should 

 this finally prove to take place, the species must be removed from Diphyes to 

 Diphyopsis. 



The records of capture show that D. spiralis is a surface form. 



Diphyes bojani (Chun). 



Plate 7, fig. 2,3; Plate 8, fig. 6; Plate 9,fig. 1, 2; Plate 10, fig. 2, 3; Plate 11, fig. 5; Plate 12, fig. 1. 



Doromasia bojani Chu.n, '92, p. 108, 110, fig. 8. 



Diphyes indica Lens and V.4N Riemsdijk, :08, p. 44, pi. 7, fig. 54. 



Diphyes malayana Lens and Van Riemsdijk, :08, p. 4.5, pi. 7, figs. 55, 56. 



Diphyes gegenbauri Lens and Van Riemsdijk, : 08, p. 46, pi. 7, fig. 57, pi. 8, fig. 58. 



Doromasia picloides Lens and Van Riemsdijk, :08, p. 3, pi. 1, fig. 1. 



This species was taken at the following Stations:— 4587, 4588, 4592, 4605, 

 4644, 4665, 4673, 4676, 4684, 4687, 4695, 4704, 4707, 4708, 4710, 4721, 4722, 

 4724, 4727, 4734, 4735, 4740, and 4741. The records are from both surface and 

 intermediate (300-0 fathom) hauls. The material consists of two entire col- 

 onies, sixty-two anterior, and fifteen posterior nectophores. The largest anterior 

 nectophore is 21 mm. long, the smallest, 6 mm. The largest posterior nectophore 

 is 19 mm. The collection forms a continuous series between these extremes. 



As a test of the constancy of the characters of the anterior nectophore on 

 which Lens and Van Riemsdijk separate their D. indica, malayana, and gegen- 

 bauri, i. e., size and form of the basolateral teeth, number of ridges at the apex, 

 and degree of serration of the ridges, I have tabulated them in fifty specimens, 

 including the largest and the smallest, with the following results: — 



