632 ALLIS. [Vor. XII. 
needs some explanation. Collinge further repeatedly states 
that the rami buccalis, oticus, and ophthalmicus superficialis are 
branches of the trigeminus, and then, based on this assertion, 
arrives at the conclusion (No. 19, p. 515) that, “The fact of 
the trigeminal actually innervating a part of the sensory canal 
system is of special interest.” Had he assigned the nerves to 
the facialis, or to the lateralis, as is usually done, the recorded 
facts would lose their special interest. 
Collinge, in referring to my earlier work, corrects a state- 
ment made by me regarding the operculo-mandibular canal in 
Amiurus catus. As I find the canal in Silurus glanis as he 
gives it in Amiurus, he is undoubtedly correct. In further 
reference to my work, he says (No. 109, p. 504) that I gave the 
name ‘peripheral organs”’ to “a system of fine dermal canals”’ 
“opening by a series of fine branches to the surface by isolated 
pores.” This is as evidently an error. For these canals and 
their openings in Polyodon, Collinge proposes the name “ clus- 
ter pores: Water aim the text (No. 10, p).513),;cluster pores 
are said to be a “series of organs” agreeing “almost in every 
detail with the Spaltpapillen of Fritsch,” and containing, like 
them, sense cells, into which fine terminal nerve fibres pass. 
«Primitive pores” in Polyodon are said to be “fine pore-like 
openings, spoken of as pin-hole pores by many authors.” These 
primitive pores connect with the small branches of the main 
canals (No. 19, p. 509), apparently as their external openings, 
but each pore contains a sensory organ at its base (No. 19, 
p. 514), and in section (No. 19, Fig. 5) closely resembles a 
pit organ of Amia. As the branches of the dendritic canal 
systems open on the external surface by these “pores,” each 
of which contains an organ, and as no organs of any kind are 
definitely described at any place in the canals themselves, it is 
evident that Polyodon, as the author states, “exhibits a number 
of interesting features at present not known to occur in any 
other ganoid.” 
In Gadus a line of surface organs is found along the lower 
edge of the mandible, parallel to the mandibular canal, and 
it is innervated by a long branch of the externus facialis, 
which first runs forward through the adductor mandibulae, to 
