W. H. Leigii-Siiarpk 
261 
Species 
L. scyllicola 
9 T 
L. scyllicola and 
L. mustelicola 
Host 
S. canicula 
n 
99 
99 
Mustelus vulgaris 
Location 
Length of “arms” 
High up in the 7 mm. (equal in length to trunk) 
extra-cloacal 
aperture f 
Clasper groove J 3-5 mm. 
Tip of clasper 1-5-2 mm. 
Above pelvic fins: ( 
• between them and '! 2-5 mm. 
, body wall l 
* I have not yet met with this species upon Lamna. My hypothesis, that those species 
having free play are short armed, is not supported in this instance, 
f Parasitology, vm, 263. Fig. 1, Position a. 
J ibid. Fig. 1, Position G. 
A comparison of the mandibles of the four commonest species of 
Lernaeopoda $ (Fig. 3). 
(For a detailed discussion see under L. galei.) 
Abbreviations: H, principal teeth; Z, 
L. SCYLLICOLA 
L. GALEI 
Heterodont 
Heterodont 
The principal are 
The principal are 
serrate 
serrate 
Formula: 
Formula: 
HI 
HI 
ZI 
ZI 
HI 
HI 
ZI 
ZI 
HI 
HI 
N4 
ZI 
— 
HI 
— 
N3 
Base: 
Base: 
Somewhat triangular 
Spherical and small 
and flattened 
intermediate teeth; N, secondary teeth. 
L. GLOBOSA 
L. MUSTELICOLA 
Homodont,. all princi¬ 
Heterodont 
pal, uncinate, decrease 
The principal are 
in size proximally 
serrate 
Formula: 
Formula: 
H6 
HI 
— 
ZI 
4 
HI 
— 
HI 
— 
ZI 
— 
HI 
— 
N4 
Base: 
Base: 
Spherical and of 
Spherical with a 
moderate size, some¬ 
hooked projection 
what flattened 
on the inner side 
A comparison of the maxillipedes of the four commonest species of 
Lernaeopoda $ (Fig. 4). 
L. scyllicola. Basal joint long and slender, provided with two rounded 
cushions, well developed and covered with papillated spines. Proximal 
cushion situate at some distance anteriorly to base of joint. Between the 
cushions is a large mamillated, upwardly curved hook. 
Terminal joint long and slender, provided with a rounded cushion of 
papillated spines also well-developed, and terminating in a long abruptly- 
curved claw, with an accessory claw at its base ventrally, and two smaller 
claws at the base, on the side of the concavity. 
