H()S fill!, w . wiioDLAM) ON I'liio [No\-. 27, 



'Pill' spirac'uliii' cli'l't is \ciy laryc luul jiill-i'lcvfi-likc, iiud lies 

 dorsally ii.t the saiiic (list.-mce IVoiii liie extu'euiity of the snout jus 

 the veutvally-sitiiatod ])osteri()r aiigli-s ol" []\r mouth. When I 

 received the lish, about one ineli or more of I lie riijlii eloujuated 

 li\(>r lobe was protrudini^- through tlx^ abdominal pore of the 

 same side, whieh latter was enlarged to at least six times its 

 normal size (PI. LA''!!, tig. 1); ahso on opening the abdominal 

 ea\-itv the entire cardiae portion of the (mnpty) stomach was found 

 to be thrust up the (esophagus into the buccal ca.vity, both of 

 which features were due to the sudden release of the animal when 

 brought to the surfai-e from the considerable external pressure 

 under which it noiaually exists (the pressure due to TiOO fatlunns 

 of watei-). 'The eves ace large, as in many d(>ep-sea fishes, 

 l^'ig. '2 re})reseid.s the form of the dermal scutes, which is the 

 same whether the vscutes be taken from the dorsal or the ventral 

 surface of the animal. Their form dillers somewhat from that 

 represiuvted in I he liguic ol' the skin o\ ( '. (<(/cciis supplied by 

 (h>g(Md)aiu'. .it may also he witrth uientioiiing thai- the peritoneal 

 lining of the body-cavity was silvery-grey in colour anothei- 

 chai'a-cteristii^ feature of (leep-sea fishes. 



Previous Avork on the anatomy of this species has been limited, 

 so far as I am able tt) discover, to the examination of the bead- 

 skeleton " and eye-muscles'' by C^egenbaiu- and of the occipito- 

 siun:d nerves by Fiirbringer "' these two investigators probably 

 ha\ing a single specin\en at their disposal. 



Before proceeding to the dest-ription of the anatomy of ( '. calceas, 

 \ wish to ex])ress u\y ii\debtedncss to Dr. E. J. Allen, who very 

 kindly acceded to \ny desire to purcha.se the lish for anatomical 

 examination when il- was brought to tlie Plymouth Laboratory ; 

 to Mr. Boulenger, who readily penaitted me to examine nun\ei'ons 

 specimens of allied Selachians preserved in the British Museum 

 during the course of my enquiries ; to Dr. llidewootl. who very 

 kindly read through the maiuiscript and advi.sed me on several 

 points; and to l^rofessor Minchin and Profcvssor Hickson for 

 sc\ei'al u.s(>fnl suggestions. 



TniO Al.lMKXTAUV 'ri'vAOT AND AsSOCIATlCD (! LANDS. 



So far as I can gather from a fairly comprehensive survey of the 

 litei'a-tnre relating to the subject, the alimentary ti'act of C. ccdceus 

 (PI. LV.11. :fig. is) is striking in several \'espects. In the first 

 place, the pyloric portion of the stomach is, owing to its thick walls, 

 exceedingly stout, is half as long again as the cardiac ])ortion, and 

 was not \'ertexed so as to lie parallel witli this latter and in 

 apposition with it, as is the case e. </. in the ordinai-y Sci/Uitnii 



^ ' Uuti'i'siu'luuigcn y.iir vor^-lciclu'iuUMi Auatoniic tier Wivltdlliii'iv.' licipzifi', 



1872. (Fifis. on pliitos vi., viii., xii., xvi., and \x. of this work.) 



!i ' Vovo>UMclun\(lo Aniitoniio di-v Wivlu'ltliiovc' Bd. i. ISOS (IIl;'. ">8'.t on p. Dl'J). ^ 

 10 '* vi'hvr die Spino-iu'cipitMlcn Novven dcv St'liiohicv nnd Uoloreidialon and ilivc 



voru'loicluMido Moviiholouic " in (u'gvnlianv's' Fostscliril't /.nni siclicn/isistiMi Ooburt- 



sta;;-*',' vol. iii. ljt'ii>/.i,u', 1S1>7. 



