1 382.] Recent Literature. 669 



ception of the morphology of the carapace, which has long since 

 been shown by Dana to be morphologically a development of the 

 second antennal and mandibular tergites, which grow back so as 

 to cover the thorax. Huxley's "cervical groove" appears, then, to 

 be an artificial line and of no morphological importance. The 

 thoracic tergites being aborted are protected by this large cephalic 

 shield. In the zoea the shield or carapace is an expansion of the 

 tergal or dorsal part of the consolidated antennal and mandibu- 



So also embryology abundantly proves that the eyes are devel- 

 oped on the antennal segments, and that the eye-stalks of crabs 

 and shrimps are simplv functional adaptations occurring after 

 zoeal or larval life. Hence the old-fashioned view entertained by 



