140 a. HERBERT FOWLb.R. 



pyramidal plate of what looks like chitin ; fig. 12, e, shows the 

 inclusion of flat ragged plates of the same substance, and I 

 have twice noticed a portion of a Radiolarian or Diatomaceous 

 skeleton similarly included. Inclusions and coloured granules 

 alike point to the excretory nature of these brown corpuscles. 

 They may fairly be compared with the amoeboid fragments of 

 the excretory splanchnic epithelium found in the coeloni of 

 many Chaetopoda. 



The clear corpuscles are probably of more than one kind. 

 They often have such a fibrous appearance internally as is 

 presented by an irregularly wound ball of fine cotton. In 

 some specimens clear corpuscles without this fibrous look 

 appear to be undergoing an irregular segmentation (fig-. 13), 

 the larger ones then appearing to lie inside a fine membrane. 

 In one specimen, stained and teased in oil of cloves, almost 

 every corpuscle in the phseodium was more or less morulated 

 (fig. 14). In the morulte the ends of the spheres are ap- 

 parently connected with a central mass (fig. 14, e) ; their outer 

 ends generally are more deeply stained than the inner. It is 

 possible that this stain is due to something in the nature of a 

 nucleus. I can make no suggestion as to the nature of these 

 segmented bodies, which are not plentiful in every specimen. 

 Other inclusions noticed in the phgeodium were (a) commonly, 

 spherical, homogeneous, highly refractile, and colourless 

 bodies ; (h) rarely, deep brown concentrically laminated 

 irregular spheres ; (c) commonly, plates of what looked like 

 chitin, generally more or less completely folded ; [d] once, a 

 minute crustacean mouth-part; (e) very rarely, a fragment 

 of Diatomaceous or Radiolarian skeleton ; (/) once, what 

 looked like the primary chamber of a Globigerina; {g) twice, 

 the organism figured in 12 a and 15. On the whole the 

 indications of food are curiously infrequent, those of excretion 

 prominent. 



A few words on methods may not be out of place. The 

 ph8eodiu)n is so opaque that solid preparations are not satis- 

 factory, but Grenacher's alum carmine yields fair results after 

 days of immersion in acid alcohol. Borax carmine is unsatis- 



