448 THE MYOLOGY OF AMIURUS CATUS. 
PLATE III. 
Fie. 1.—Head of Amiurus Catus, after removal of the integument and super- 
ficial fascia. Pmax = premaxille ; Na =nasal ; AnA = adnasal ; 
Eth=Mesethmoid ; Prf=Ectethmoid ; #r=Frontal ; SO=Supra- 
occipital ; Pul=Palatine ; Mx=Maxilla; Mn=Mandible ; Qu= 
Quadrate ; Op=Operculum ; Brst—Branchiostegal rays ; #=Hye ; 
S. Ob=Superior oblique; #. R. & S. R.=External and Superior 
Recti. 
AM=Adductor mand. ; AV—Add. tentaculi; LAP=Lev. 
arcs pal.; LOp=Lev. operc. 
Fiu. 2.—Same as preceding, but with add. mand. removed. In addition to 
certain letters in preceding figure the following occur: HePi=No. 
4; MPtand HnPt=portions of the Metapterygoid ; Pf=Sphenotic; 
PtO=Pterotic. 
AdT=Adadd. tentaculi; Dil. Op.=Dilat. opereuli. 
Fie. 3.—Under surface of head of A. Catus. GH=Geniohyoideus ; Hh! = 
upper yortion of Hyohyoideus ; Hh? = lower portion of Hyohyoi- 
deus ; /m = Intermandibularis ; ti and ti! = tendinous bands to 
extremities of which tentacles are attached. 
Fic, 4.—Under surface of branchial arches of A. Catus, the hyoid being 
removed. UHy—Urohyal ; HyH=Hypohyal ; I., I1., 11I., IV., 
V.=Branchial arches. 
HyP=Cut ends of the Hyopectoralis ; H&r=main portion of 
Hyobranchialis ; HBr! = slip of same to Ceratobr. ii. ; HBr? = 
slip to Ceratobr, iv.; HBr? = slip between Ceratobrs. iii, and iv. ; 
HBr‘ =slip between Ceratobrs. iv. and v.; 7Viand 7 V2=an- 
terior and posterior Transv. vent.; PhHc—Pharyngo-clav. exter- 
nus ; PhJn—Pharyngo-clav. internus ; Ob V1 = and ObV? = first 
and second Obliqui Ventrales. 
Fic. 5,—Transverse section (partly diagrammatic) through the pectoral arch, 
slightly ventral to the articulation of the fin. (This and the suc- 
ceeding figure are in reversed position, ths clavicle should be be- 
low.) Cl=Clavicle; Cor=Coracoid: the letters point to the 
bridge articulating with the Clavicle ; sp=Spiculum on Coracoid 
forming a bridge over Add. prof.; AbP! = first portion of Abd. 
prof. ; AbP2 = second portion of same ; AbS'= first portion of 
Abd. Sup.; 40S? = second portion of same ; ddP=Add. prof. 
Fie. 6.—Transverse section of pectoral arch some distance nearer the median 
line than fig. 5. Letters same as in preceding figures. 
Fie. 7.—Ventral musculature of ventral fin. VM!and VM2= median and 
external portions of ventral musculature of the trunk ; VA=apon- 
eurosis of ventral musculature of trunk ; AdS=adductor superfic. 
pelvis ; C=cartilaginous horseshoe of pelvic arch ; VF= ventral 
fin. 
Fie. 8.—Superficial and intrinsic muscles of the caudal tin. Cd=dorsal con- 
tinuation of caudal fin ; /t=intrinsic muscles; My! and My? = 
upper and Jower prolongations of myocomma ; f=fascia; LL= 
lateral line. 
Fic. 9.—Deep muscles of the caudal fin. D=dorsal portion; V1 and V# 
=upper and lower divisions of ventral portion ; ct=connective 
tissue. 
