448 THE MYOLOGY OF AM1URUS CATUS. 



PLATE III. 



Fit!. 1. — Head of Amiurus Catus, after removal of the integument and super- 

 ficial fascia. Pmx = premaxillae ; Na =r nasal ; AnA = adnasal ; 

 ^i/t=Mesethmoid ; Pr/=Ectethmoid ; Pr=Frontal ; SO=Supra- 

 occipital ; Pa 1= Palatine ; Mx =M axilla ; il>ftt=Mandible ; Qu= 

 Quadrate ; Op = Operculum ; i>r.s^=rBranchiostegal rays ; 2£=Eye ; 

 S. 06=Superior oblique ; E. R. & 5. i?.=External and Superior 

 Recti. 



A M= Adductor mand. ; A T= Add. tentaculi ; LAP— Lev. 

 arciis pal. ; LOp=Lev. operc. 



Fid. 2. — Same as preceding, but with add. mand. removed. In addition to 

 certain letters in preceding figure the following occur : J£cPt=No. 

 4 ; MPt and i7?iPiI:=portions of the Metapterygoid ; P/=Sphenotic; 

 P<0=Pterotic. 



AdT=Add. tentaculi; Dll. Oj?.=^Dilat. operculi. 



Fig. 3. — Under surface of head of A. Catus. G.ff^Ceniohyoideus ; Hh 1 = 

 upper yortion of Hyohyoideus ; Hh 2 = lower portion of Hyohyoi- 

 deus ; Tm = Intermandibularis ; ft and ti 1 = tendinous bands to 

 extremities of which tentacles are attached. 



Fig. 4. — Under surface of branchial arches of A. Catus, the hyoid being 

 removed. C.flfy=Urohyal ; iTi/ J ff=Hypohyal ; I., II., III., IV., 

 V.=Branchial arches. 



HyP— Cut ends of the Hyopectoralis ; i/i?r=main portion of 

 Hyobranchialis ; HBr 1 = slip of same to Ceratobr. iii . ; HBr 2 — 

 slip to Ceratobr, iv. ; HBr 3 = slip between Ceratobrs. iii, and iv. ; 

 I7i?r 4 = slip between Ceratobrs. iv. and v. ; T'F^and T V 2 = an- 

 terior and posterior Transv. vent.; PAifo;=Pharyngo-clav. exter- 

 nus ; Phln — Pharyngo-clav. internus ; Ob V 1 = and ObV 2 = first 

 and second Obliqui Ventrales. 



Fig. 5. — Transverse section (partly diagrammatic) through the pectoral arch, 

 slightly ventral to the articulation of the tin. (This and the suc- 

 ceeding figure are in reversed position, ths clavicle should be be- 

 low. ) C7=Clavicle ; Cor— Coracoid : the letters point to the 

 bridge articulating with the Clavicle ; sp=Spiculum on Coracoid 

 forming a bridge over Add . prof. ; A bP 1 = first portion of Abd. 

 prof. ; AbP 2 = second portion of same ; AbS 1 = first portion of 

 Abd. Sup.; AbS' 2 = second portion of same ; AdP— Add. prof. 



Fig. 6. — Transverse section of pectoral arch some distance nearer the median 

 line than fig. 5. Letters same as in preceding figures. 



Fig. 7. — Ventral musculature of ventral fin. VM 1 &nd VM 2 = median and 

 external portions of ventral musculature of the trunk ; F-4=apon- 

 eurosis of ventral musculature of trunk ; JW/S^adductor superfic. 

 pelvis ; C— cartilaginous horseshoe of pelvic arch ; VF= ventral 

 fin. 



Fig. 8. — Superficial and intrinsic muscles of the caudal fin. Crf— dorsal con- 

 tinuation of caudal fin ; 7<=intrinsic muscles ; My 1 and My 2 = 

 upper and lower prolongations of myocomma ;/= fascia ; LL= 

 lateral line. 



Fig. 9. — Deep muscles of the caudal fin. Z>=dorsal portion; V 1 and V s 

 =upper and lower divisions of ventral portion ; ci=connective 

 tissue. 



