BULLETIN 



OF THE 



ESSEX: IISrSTITTJTE. 



Vol. 2L Salem: Jan., Feb., March, 1889. Nos. 1-2-3. 



THE DEVELOPMENT OF CRANGON VULGARIS. 

 Third Paper,^ with Plates I, II, III. 



BY J. S. KINGSLEY, SC.D. 



THE ALIMENTARY CANAL AND ITS APPENDAGES. 



In thc preceding account(Vol. xviii, pp. 109-138, pl. i, 

 figs. 7, 8 and 9) may be foimd a description of the process 

 of gastriilation in Crangon, together with a summary of the 

 then existing literatnre of the development of the germ 

 layers in the Arthropods. To this acconnt I would here 

 add a few snpplementary remarks, bringing the subject 

 down to the date of writing and also correcting niy own 

 observations in the light of my hiter studies. 



Since the article referred to was in type, several papers 

 on Arthropod development have appeared, which have a 

 bearing upon the points discussed. First is that of Morin 

 ('87), on the development of spiders belonging to the 



' Continued frora the Bulletin of the Essex Institute, Vol. xviii, 

 pages 99-153. 1886. Published May, 1887. The uumberlng of the 

 ügures ou the accompanying plates is cousecutive with that of the 

 preceding part of this series. 



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