208 EXPEDITION OF THE "ALBATROSS," 1899-1900. 



being well enough preserved, probably, to show the last two structures. 

 Furthermore, we are unable to give any definite information about the 

 different areas of oikoplast epithelium distinguished by Lohmann, 1896, 

 and other writers. Along the dorsal side of the body PL II, fig. 9, 

 occurs a band of epithelium with distinct, cuboid cells that may be 

 " membranophasts." 



The absence of the enormous secreting cells situated on each side of 

 the body, well toward the anterior end, and constituting what is called by 

 Lohmann the " oval " has surprised us not a little. We w^ere at first inclined 

 to interpret the endostj'le, or rather the great gland cells in it, as being 

 these organs ; but microtomic sections of the body revealed at once the 

 erroneousness of this conjacture. 



The gland cells of the endostyle, fig. 9, are apparently quite similar in 

 size, structure of the cell body, and size and form of the nucleus, to those of 

 the " oval." In none of the species of the genus hitherto described do we 

 find special reference to the great development of the gland cells of the 

 endostyle, though in some, e.g., 0. iiitcrincdla, it appears from the figures of 

 Lohmann, 1896, they do become much like tliose here described. x\gain, 

 Salensky, 1903, in his recently published detailed anatomical study of 0. 

 vanhoffcni, speaks of the organ as being constituted " de grosses et hautes 

 cellules glandulaires." We are unable, however, to recognize an anterior 

 as distinguished from a posterior part of the organ in any such definite way 

 as is described and figured by Salensky. There are, it is true, a few cells 

 at the extreme anterior end, somewhat larger than those of the rest of the 

 organ, fig. 9 ; but that they are different in character or relation is not 

 obvious. We count about twenty of the large cells in each of the four 

 series. Their nuclei are nearly perfect spheres, regular in outline, and con- 

 siderably clearer than is the cell body. They are situated at the extreme 

 outer ends of the cells. It should be mentioned that our description of the 

 endostyle is made chiefly from specimens examined in toto, sectionized 

 material not being sufficient to enable us to do much more than make out 

 definitely that the large cells belong to the organ. We do not wish to be 

 understood as casting doubt on Salensky's interesting observation relative 

 to the anterior and posterior coeca of the endostyle, both communicating 



