6 Dr. & the Rev. SaGraliam Brade-Birks— 
posterior end of the body is taken by Verhoeff to be an 
erroneous observation. From the fact that Dubois did not 
find all Scolioplanes luminous, Verhoeff thought that the 
best explanation would be that the sternal glands were 
infested with luminous bacteria. He adds that Dubois 
asserted that Scolioplanes illuminated the whole body with 
the exception of the head, but the anterior and posterior 
parts of the trunk most strongly and persistently. In a 
more weakly luminous condition there was a correspondence 
between the light and the situation and extent of the 
Fig. 3. 
Chatechelyne vesuviana, Gland-group of one of the pore-fields of the 
ventral plates seen in section, 
eg, gland-cell; fm, muscle-fibre. J. W. Smith & 8. G. B.-B. phot.-del. 
(From Verhoeff, (12) pl. v. fig. 9, with some lettering omitted, after 
Duboscq. | 
alimentary canal. In mentioning a subsequent assertion 
of Dubois that Scolioplanes cau illuminate without any 
appreciable * giving up of a secretion and the same author’s 
query as to whether the luminosity of the whole middle line 
of the body would be pronounced if the luminous substance 
arose from skin-glands, Verhoeff points out that a distri- 
bution of glands over aimost all the sternites would be 
* “ohne irgend ein Secret abzugeben.” 
