CHLAMYDOSELACHUS ANGUINEUS. 41 
From the data at hand it is not possible to determine the variation 
in the specimens taken at these widely distant localities. It is true 
that Giinther found but twenty-five teeth on the lower jaw of his 
specimen, and that Kner’s specimen had but twenty-six, but it must 
be remembered that these specimens were ten inches or less in length 
while the individual taken by the “ Albatross,” having thirty-one teeth on 
the lower jaw, has a length of more than eighteen inches, which at once 
raises questions as to differences in this respect on account of age. 
CHLAMYDOSELACHID. 
Chlamydoselachus anguineus. 
Chlamydoselachus anguineus Garman, 1884, Jan. 17, Bull. Essex Institute, Vol. XVI., with figures ; 
1884, Feb. 1, Science, p. 116; 1884, March 21, Science, p. 345; 1884, Nov. 28, Science, 
p- 484; 1885, July, Bull. Mus. Comp. Zodl., Vol. XII., No. 1, with 20 plates; 1885, 
July, Proc. Amer. Assoc. Ady. Sci., 537; 1887, March 18, Science, p. 267. 
Didymodus anguineus Cope, 1884, March 7, Science, p. 275; 1884, April, American Naturalist, 
p. 412; 1884, May 30, Science, p. 645; 1884, “ Printed July 1,” Proc. Amer. Phil. Soc., 
p. 572. 
Plate LXX., Lateral Canal System 
This shark is one that may confidently be expected to appear in future 
collections from the region about the Galapagos. It occurs in both the 
Atlantic and the Pacific, like Isistius and Centroscyllium ; it is of present in- 
terest mainly in comparisons. At different times the Museum of Comparative 
Zoblogy has come into possession of several specimens and opportunity has 
been taken to verify items originally derived from the type. As long ago 
as 1886, on the arrival of a second individual from deep water near Tokyo, 
Japan, it was seen that the tail of the type was deformed, as previously 
suspected, and the following note was printed by the writer in “Science,” 
Vol. IX., No. 215, p. 267, March 18, 1887. “ The Tail of Chliamydoselachus. 
A recent opportunity of examining a second specimen of Chlamydoselachus 
furnished the means of adding an item or two to our knowledge of that 
peculiar genus. In several points the example differed from that originally 
described. This was notably the case with the tail. On the later capture 
this organ was a little more than one-fourth of the total length, and, with 
the vertebral column, tapered to a sharp extremity; whereas in the first one 
it stopped abruptly, with vertebrae of considerable size, as if truncate. On 
the new one, the lateral line, with a few short breaks posterioriy, continued 
