CONTENTS. 



I. Introduction. 

 II. Tbe life history ofStenopus hi.spiilus. 



Srrtion 1. Natural history "I Steuopus. 

 Section 2. Segmentation and tlie early 

 Section 3. Metamorphosis of the larva. 

 Section 4. The adult. 

 Remarks. 

 List of species. 

 Literature of Steuopns. 



III. The habits aud metamorphosis of Gouodactylus chi- 



ragra. 



.Section 1. The structure aud habits of the adult. 

 Section '2. Metamorphosis. 



IV. The metamorphosis of Alpheus. 



Section 1. The metamorphosis of Alpheus minus. 

 Section 2. The metamorphosis of Alpheus hete- 



rochelis in the Bahama Islands. 

 Sections. The metamorphosis of Alpheus hete- 



rochelis at Beaufort, North Carolina. 

 Section 4. The metamorphosis of Alpheus hete- 



rochelis at Key West, Florida. 

 Section 5. The larval development of Alphens 



saulcyi. 



V. Alpheus : A study iu the development of the Crus- 



tacea. 



Introduction. 

 Methods. 

 PART FIRST. 



Section 1. The habits ami color variations of 

 Alpheus. 



[With fifty-seven plates.] 



PART FIRST Continued. 



Section 2. Variations in Alpheus heterochelis. 



Section 3. The abbreviated development of 

 Alpheus and its relation to the environment. 



Section 4. The adult. 



Section f>. Variations from the specific type. 



Section G. Measurements. 



Section 7. The causes and significance of varia- 

 tion in Alpheus saulcyi. 

 PART SECOND. 



Development of Alpheus. 



Section 1. Structure of the larva of Alpheus 

 saulcyi. 



Section '2. The origin of ovarian eggs in Alpheus, 

 Homarus, and ralinurus. 



Section 3. Segmentation iu Alpheus miuox 



Section 4. The embryology of Alpheus. Stages 

 1-13. 



Section 5. Notes on the- segmentation of Crusta- 

 cea. 



Section 6. Cell degeneration. 



Section 7. The origin aud history of wandering 

 cells iu Alpheus. 



Section 8. The development of the nervous sys- 

 tem. 



Section 9. The eyes. 



Section 10. Summary. 



Section 11. References. 

 Explanation of figures (accompanying each plate). 



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