12 AKT. 15. — II. OHSHIMA : SOME OBSERVATIONS 



apparently corresponds to what I have called the outer reflector 

 in Maurolicus, but differs in having an additional pigment layer 

 lining it on the inner surface, which layer is absent in my 

 species. It seems that there exist no spicules in this part ; the 

 elongate nuclei are found very sparsely. 



The internal space enclosed by the reflectors is filled 

 up with photogenic body and connective tissue. The con- 

 nective tissue, in which the blood vessels are sparsely dis- 

 tributed, is very weakly developed around the photogenic cells. 



The photogenic body consists of irregular polyhedral gland- 

 cells (Phi and Fho), filling the interior of the organ ap- 

 parently without any regular arrangement except near the 

 opening of the inner section, where the cells are arranged in 

 layers parallel to the semicircular cracks (Cr). When fresh, they 

 form a milky mucus which turns greyish in spirit. 



Most of the photogenic cells contain a single nucleus, but in 

 some of them two nuclei may be found as stated by Gatti (PI. I, 

 figs. 5 and 6, nu). Moreover, one distinguishes two parts in the 

 cell, the cytoplasm and the secretion product. The cytoplasm (pr), 

 in which the nucleus is always found imbedded, is dense, homo- 

 geneous and highly stainable with hœmatoxylin, while the secretion 

 product (sc), which readily stains with eosin, apj)ears like a sort 

 of fat-drops of various sizes or like starch grains of potato cells. 

 Drops of the secretion occupy a part of the cytoplasm in which 

 they were produced, gathering together in a common vacuole-like 

 space formed inside the cell. Gatti found the cytoplasm form 

 a network which he called " massa filare," in the meshes of 

 which a plasmatic substance, *' massa interfilare," was contained. 

 Judging from his figure (Tav. T, 7"), his " massa interfilare " 

 does not appear to be identical with the fat-like substance of 



