Curious Markings on a Dolphin. 503 
has noted that during the contraction of the mylohyoid the 
tongue “ wird nach vorn und oben gezogen.”’ For the further 
development of this movement into the protrusion of the 
tongue all that is required is the further simultaneous advance 
of the hyoid bone and a more complete contraction of the 
mylohyoid muscle. 
I propose completing this study with a detailed account of 
the dissection of the structures involved, for which [ am 
awaiting the supply of larger objects than the common grass- 
frog, which is alone at my disposal at Cork. 
“LXIV.—Note on a Dolphin showing traces of an Encounter 
with a Cuttlefish. By Professor D’Arcy W. THOMPSON, 
CB: 
A SPECIMEN of Grampus griseus which I obtained last 
Christmas at Galway set me thinking of the curious markings 
which have been often described as present on this species, 
though I did not find them on this particular specimen. 
These markings are well figured in Flower’s paper in the 
‘Transactions of the Zoological Society’ (vol. viii. pl. i.) ; 
and the suggestion first made by Capt. Chaves, of Ponta 
Delgada *, that they are the traces of encounters with large 
cuttlefishes is now well known and generally accepted. The 
purpose of this note is to call attention to a very much older 
figure of a dolphin on which a great cuttlefish has left his 
unmistakable marks, 
The annexed figure is a copy of that on pl. xxviii. (Mam- 
miléres) fig. 2, of the ‘ Voyage de |’Astrolabe,’ and represents 
the lower surface of the head of Delphinus nove-zelandic, 
Q. et G., a somewhat doubtful species very closely resembling 
D. delphis. On p. 160 of the text the authors say :—“ On 
remarque sous la machoire inférieure des pores formant de 
petits anneaux ; et sur le corps, de petites plaques de stries 
blanches assez réguligrement contournées.” ‘This statement 
appears again in Gray’ s ‘Catalogue of Seals and Whales,’ 
p- 246. A glance at the figure ‘will show that the so-called 
pores are the clear impressions of the suckers of a cuttlefish. 
The dolphin itself was 5 feet 10 inches long, and we may 
judge from the figures that the sucker-rings were about, or 
very nearly, an inch in diameter. We may, perhaps, goa 
* In Girard’s “ Céphalopodes des iles Agores,” Jorn. Sc, math. phys. e 
natur., Lisboa, (2) 1. 1892. Cf also Richard et Neuville, Mém. Soc. 
Zool., Paris, vol. x. p. 102 (1897). 
