1906.] ON" THE ANATOMY OF CEXTROniORL'S CALCEUS. 865 



8chi'enk's Arvkola amurensis*, from the Lower Amur, is 

 probably n true Ettotomys. It Jias a iiiolar tooth-row of only 

 4" 7 mm. 



It may be remarked that of this fine series not even the oldest 

 specimen shows any trace of the formation of roots to the molars. 



9. Lepus coreakus Thos.t 



c?. 720. $.717,718,719. Taiku, Southern Korea. 500'. 

 The type of this Hare was obtained by Mr. C. W, Campbell at 

 Seoul, in 1889. 



4. On the Anatomy o£ Centroplun'uis calceus (crepidalhus 

 Bocage & Capello) Gilnthcr. By W. Woodland, 

 F.Z.lS.j Demonstrator of Zoology, King's College, 



London. 



[Received October 8, 1906.] 



(Plates LVII.-LXII.t and Text-figures 127-138.) 



(Jentrophorus ccdceus is one of the rarest, if not the rarest, 

 species of the not very common genus CeHtrophorus. For this 

 reason alone, a description of the anatomy § of the species is a 

 desideratum ; but in addition to this, there is the fact that up to 

 the present no single member of the genus has yet been fully 

 examined with regard to its intei'nal organisation, and hence, 

 on both grounds, the following fairly complete Account of the 

 structni'e of a female specimen of the above-named species may 

 prove of value. -Further, I may add that certain portions of the 

 anatomy of Centrojihoras calceus are peculiar, and such I shall 

 of course consider at greater length than those which more or less 

 partake of the normal selachian type. The comparative rarity i| 

 of C. ccdceus is most conspicuously proved by the fact that whilst 

 the British Natural History Museum at the present time possesses 

 three adult female specimens and two embryos, the Pai-is Museum 

 three adult females and five embryos, and the Berlin Museum one 

 poorly-preserved specimen, the museums of Brussels, Vienna, 

 Stockhohn, Naples, New .York, Cambridge (Massachusetts), 

 8t. Petersburg, Tokyo, Cape Town, and Calcutta do not possess a 

 single specimen. The distribution also of C ccdceus is extremely 

 limited, specimens of the species hitherto, judging from my own 

 enquiries and the statements I have met with, alone having been 



* Reis. Amur-lande, i. p. 129 (1859). 



f Lepus sinensis coreanus Thos. Ann. Mag. N. H. (6) ix. p. 146 (1892) . 



X For explanation of the Plates see p. 884. 



§ Tliis piece of work was done, with others, during- nij"^ tenure of the Derby 

 Scholarship (1903-1905) at Universitj' College, London. 



II Bocage and Capello, however, state that C. ccdceus " n'est pas rare dans nos 

 mers [off coasts of Portugal], et nos pecheurs la counaisseut tr3S-bien sous le nom 

 de ' sapata-branca ' " ; Lowe, on the other hand, applies to his " Centrophonis 

 calceus'' the term "rarior," tliough not "rarissima." 



