﻿90 



52 



Fig. 32. 



C. smlopax. Visoi-ni srin rinm tlu- U'll side. // IV: 



tian.sverse pioces.sos (if 2nd-4th verlebra: lis: hæniiil 



spine; oe: oesophagus: i: intestine; r: rectum; h: liver; 



c: heart; Ih: thymus; re : head-liidney ; Je: kidney; 



s: swim-bhidder ; go: ovary. 



which Ihe .swim-bladder can be seen. The musculature of the 2nd dorsal fin, the 

 caudal fin and the anal fin shows nothing remarkable; as in Ampbisile the muscles 

 are large which move the two rays of the caudal fin towards one another, which 

 are situated on the boundary respectively of the upper and lower hypural bones. 



With regard lo the first dorsal, the 

 muscles for the first spinous ray, on the 

 3rd interspinous bone, are weak; of those 

 to the 2nd, the large dorsal spine on the 

 4th interspinal, the anterior, M. erector, 

 is very i30werful; its muscular mass fills 

 the whole of the space between the in- 

 terspinous hones 3 and 4; it is pennate 

 with a distinct tendinous strip in the 

 middle, which increasing in thickness is 

 continued into a tendon attached in front 

 of the base of the ray. The posterior, 

 M. depressor, is much weaker and lies 

 practically hidden under the projecting 

 lateral ridge of the interspinous bone. 

 Very weak muscles are present round 

 the 3 following interspinous bones, but they have no tendon for the spinous rays, 

 which with exception of the first are immovably fixed lo the interspinous bones. 

 I have not been able to find any muscular fibres round the posterior interspinous 

 bones for the 1st dorsal fin. 



There are 4 complete gills on 



each side and a large pseudob ranch 

 with numerous well-developed laminæ. 

 As in Ampbisile there is a slit between 

 the hindmost, gill-bearing arch and the 

 lower pharyngeals, surrounded by short 

 gill-rakers. The first part of the alimen- 

 tary canal (oe, fig. 32 ) is tubelike 

 and provided internally with high and 

 numerous longitudinal folds, just as in 

 Amphisile; but in contrast to the latter, 

 the oesophageal part is short; it passes 

 over with abrupt cessation of the longi- 

 tudinal folds into the succeeding, con- 

 siderably wider, thin-walled portion (i), which is clothed inwardly with much 

 weaker folds arranged in a net-work; this continues posteriorly, decreasing slightly 

 and quite evenly in diameter. The biliary duct (bd) opens as in Ampbisile into 

 the ventral side of the first part of this section of the canal, but at a fairly con- 



^. scolopax. Xiscvrn i'v 

 bd: l)ile-duet: /: sple 



ide. h: nall-l)ladder ; 

 letters as in lig. S2. 



