264 ERSAEA BOJANI. 



by Lens and Van Riemsdijk the asymmetrical nectophore has only three ridges 

 at the apex, a dorsal and two laterals. But all of these branch so that there 

 are six at the base. The hydroecial canal, or in this case furrow, though 

 limited by the two ventrolateral ridges, is entirely open for the greater part of 

 its length. But near its proximal end it is closed over by two short flaps 

 (Plate 10, fig. 7) one on either side, much as it is in Diphyopsis mitra. 

 Apparently these flaps were destroyed in the inferior nectophore referred pro- 

 visionally, but no doubt correctly, by Lens and Van Riemsdijk to Chuniphyes. 

 Each of the six ridges terminates at the base in a serrated tooth, the ventrolateral 

 on the right hand side being much the largest (Plate 10, fig. 7). 



The nectosac is somewhat battered, but its canals, so far as these could be 

 traced, are of the usual Diphyid type. Lens and Van Riemsdijk supposed that 

 the mode of attachment of the two nectophores must be a very singular one, 

 but as the ".\lbatross" specimens show, it is of the usual type. 



One of the most noticeable external features, already noted by these authors 

 is the transparency of both superior and inferior nectophores, and the brownish 

 color of the ridges. 



This species has not been taken on the surface. The "Siboga" record is 

 from between 1,500 fathoms and the surface, and the Biscayan specimens were 

 collected both in open net hauls from 300-0 to 1,250-0 fathoms, and in closed 

 nets at depths of 1,500-750 and 2,000-1,000 fathoms. These captures show that 

 it is a typical "intermediate" or " mesoplanktonic " organism, a habitat wliicli 

 no doubt explains the fact that it so long escaped notice in the Atlantic. 



Ersaea bojani (Eschschowz) Chdn. 



Plate 11, fig.s 7, 8. 



Eudoxia bojani Eschscholtz, '2.5, p. 743, taf. .5, fig. 1.5; '29, p. 125, taf. 12, fig. 1; Huxley, '.59, p. 59, 



pi. 3, fig. 7. 

 Cucullus gracilis Haeckel, '88b, p. 110. 

 Ersaea dispar Haeckel, 'S8b, p. 361. 



Ersaea bojani Chun, '88, p. 1154; '92, p. 108, fig. 7; Lens and Van Riemsdijk, : OS, p. 0, fig. l-fi. 

 Ersaea picia Chun, '92, p. 98, 101, fig. G, pi. 11, fig. 8. 



The family relationship of tliis Eudoxid is uncertain; it was taken at Sta- 

 tions 4587, 4590, 4598, 4605, 4661, 4663, 4667, 4669, 4673, 4676, 4688, 4707, 

 4710, 4725, 4732, and 4741, in both surface hauls and hauls with open nets 

 from 300 fathoms. The series consists of forty-three excellent specimens. 

 Lens and Van Riemsdijk, who have made a critical examination of an even 

 larger series, have found that neither of the two characters which Chun ('92) 



