CHLAMYDOSELACHUS ANGUINEUS. i 
A few times subsequently, the species has been made the subject 
of special anatomical investigations. In 1889, Dr. Ayers! made a 
report of his investigations ,On the Morphology of the Carotids, 
based on the study of the blood vessels of Chlamydoselachus 
anguineus.“ As the results of his studies (which probably were made 
on the type specimen) the Author can indicate several peculiarities 
in the construction of the blood vessels of this species, all of which 
show a lower, more primitive condition of organisation; in fact 
Chlamydoselachus holds undisputed claim to be the most lowly 
organized elasmobranch yet discovered. 
In 1895, Dr. Rose gives a detailed account of the development 
of the teeth in this species?. 
His investigations were made on an embryo, of a total length 
of 340 mm., which had been removed from a female, which, with 
another specimen of the same species, had been caught, so early as 
1881, in the bay of Tokio, Japan, and obtained by Dr. Déderlein of 
Strassburg. In 1882, the latter Author, drafted a description of that, 
hitherto, quite unknown species, which, however, was never published. 
The two specimens were, finally, secured by the Museum at Vienna, 
where they are still preserved. In the above mentioned treatise, 
Dr. Rose deals with the construction of the scales and the teeth, which, 
on the whole, agreed with that of the old specimens. On the other 
hand, he was able to prove, from the still immatured teeth, that each 
of the 3 points, of which a tooth apparently consists, represents a 
separate tooth, as they sprang from separate bases, and only by 
subsequent coalescence did these form the three pointed tooth. 
Dr. Rose adds, moreover, a supposition, based on his study of 
the fine construction of the dentine, that Chlamydoselachus is not, as 
presumed by Garman, most closely allied to the species Cladodus, 
but that it is more nearly related to the Xenacanthus®, belonging (as 
does the Cladodus) to the palzeozoic family Xenacanthidae. 
1 Bull. Mus. Comp. Zool. Harv. Coll. Cambr. Vol. 17, p. 192. 
2 Morphologische Arbeiten, B. 4, p. 192 (Jena 1895). 
3 Zittel, Handbuch der Palaontologie, III B. p. 88 (Miinchen u. Leipzig 1887—1890). 
