ON THE GENERAL MORPHOLOGY OF THE MYXTNOLD FISHES. 749 



R. 740-465 



i 757-475 I Velo-quadratus. 



R. 739-273 I „ , , .. 



L 757-289 J H yo-copulo-palatmus. 



R. 723-483 ) „ , , 



L. 745-489 f H y°- co P ul °-g lossus - 



R 721—287 ) 



T 7<U 997 l Copulo-quadratus profundus. 



T fi^9~4-10 I Q ua( irato-palatinus. 



R. 481-51 I m 4. i • * ■ 

 t *nn nr, t 1 entaculans posterior. 

 L. 503-7/ J r 



R. 478 External and Internal Heads-292 ) 



j j 498 External Head I „ m \ Palato-coronanus. 



U \ 485 Internal Head j ' • dU1 J 



> Palato-ethmoidalis superficialis. 



L. 450-126 



R. 423-201 I n , , .. 



L 430-222 J ^opu^-pa 1 ^ 111118 - 



R. 375-63 l w r 

 L. 381-72 r aSallS - 

 R. 371-123 

 L. 377-151 

 R. 



> Copulo-tentaculo-coronarius (P.F., minus the coronarius, however). 



371-7 ) 

 j „ 7 _ 97 > Copulo-tentaculo-coronarius (F.J.C.). 



t' 31 Q 1 4. A i Palato-ethmoidalis profundus. 



^ J 226 External Head )»„, 



1 266 Internal Head f I ^ , ,, ., ,. 

 T / 250 External Head I Rfi f Copulo-ethmoidahs. 



** | 278 Internal Head f Sb > 



L llt-lll } Coronarius (F.J.C). 



R. 142-12 1 „, 



> Iransversus oris. 



L. 164-27 



t" 1 p>7 Pii f Tentaculo-ethmoidalis. 



T qk~ok f Ethmoideo-nasalis. 



34. M. sphincter cloacse* F.J.C. (Fig. 4, s.cl.) 



J. Mullee, Sphincter der Cloake (Ab. AJc. Berlin, 1843, p. 167, 1845). 



This muscle, in a 32 cm. Hag, surrounded the whole of the cloaca except the most 

 postero- ventral 3 mm. When a Hag is pinned out on its back and the ventral skin 

 removed, it is seen that the obliquus muscle extends (at least) as far backwards as the 

 base of the cloacal elevation, and there ceases. The most posterior pre-cloacal fibres of 

 this muscle, instead of meeting in a median ventral linea as elsewhere, bent forwards 

 immediately in front of the cloaca, and were continued forwards external to the 

 obliquus proper for 3 mm. in a 30 cm. Hag. When these are removed it is noticed 

 that, behind, the ventral linea becomes indistinct, and there are indications of the 



* Described from dissections only. 



