30 



H ixA b Lönnberg, 



The liver has about the same general shape as in the foregoing 

 stage. The broad caudate lobe caps the kidney. The Spigelian lobe 

 is comparatively very large. It is not trihedral as in stage &, but 

 expanded into a roundish knob which is thicker than its basal junction 

 so that it seems pedunculated. 



The spleen does not seem to have advanced much more towards 

 its definitive triangular shape than in the foregoing stage. 



5) A foetus of Cephalophus melanorhoeus g e., measuring from 

 the forehead to the anus 210 mm., and from the snout to the occiput 

 77 nun. 



Although this foetus is a little smaller than the foregoing, it re- 

 presents a somewhat later stage which is seen by comparing the two 

 specimens with each other. The hair of this one is better developed 

 on the body and legs etc. The teats are fully cleft into two on each 

 side and descensus testiculorum has taken place. Situs viscerum is about 

 the same as in stage d. The liver is perhaps a little more moved to 

 the right side and the kidneys are wholly covered by fat. The trans- 

 versal coil of the rectum behind the right kidney is fully straightened 

 and has thus disappeared. 



The colic spiral has the same number of coils as in t lie fore- 

 going stau;e. The Spigelian lobe of the liver is in this specimen a 

 flattened tongue-like body with a triangular outline. A comparison of 

 the shape of this lobe in the three stages termed b, d, and f. proves 

 that the shape of this organ is much too variable to be of any syste- 

 matic value as Garrod 1 ) once believed. To use the terminology of 

 this author the Spigelian lobe of stage e. should be called »oviform» 

 and that of stage d. »rusiform». The adult specimen I have had at 

 my disposition has according to the same terminology an »oviform» 

 Spigelian lobe. Of the two species Garrod of Cephalophus himself 

 examined one, C. maxwelli, had a »modified rusiform» Spigelian lobe, 

 the other C. pygmœus, had it »modified or absent». 



The spleen is rather flattened but it still retains the elliptic outline. 



The penis has assumed its definite shape which will be describ- 

 ed for the next stage. 



6) A foetus of Ceplialoplius melanorhoeus, $ /., fully developed 

 and almost ready to be born: measuring about 25 cm. from the fore- 

 head to the vent, 87 mm. from the snout to the occiput. 



') Proc. Zool. Soc. 1877. 



