MUSEUM OF COMPAEATIVE ZOOLOGY. 



31 



The only specimen, carrying eggs is the one above referred to as taken off 

 the mouth of Chesapeake Bay. In this specimen the eggs are in an early stage 

 of development, are nearly spherical and .65 to .70 mm. in diameter, and are 

 carried in a mass behind the first pair of abdominal appendages, and between 

 the appendages of the second and third pairs, the mass being principally sup- 

 ported by the first pair, very slightly by the third, and not at all by the fourth 

 and fifth. 



Five specimens give the following measurements in millimeters : — 



Station 





326 



898 



326 



329 



326 



Sex 





9 



9 



? 



2 



$ 



Length from front of carapax to tip of 













telson 



. 



60.0 



124.0 



126.0 



83.0 



107.0 



Length of carapax along median line 



26.0 



53.2 



55.2 



36.0 



45.3 



Breadth of carapax between spines of 













anterior margin .... 



12.9 



25.5 



27.3 



16.5 



23.0 



Greatest breadth (in front of cervical 













suture" 







19.3 



40.5 



41.3 



26.7 



35.0 



Length of first pair of legs * . 



67.0 



140.0 



161.0 



100.0 



125.0 



a 



merus .... 



21.5 



42.0 



50.0 



31.7 



39.0 



u 



carpus .... 



12.5 



26.0 



32.0 



17.8 



25.0 



(( 



chela . 



21.0 



46.0 



49.0 



30.0 



38.5 



a 



dactylus 



12.6 



27.0 



29.0 



18.0 



22.0 



a 



second pair of legs 



22.3 



50.0 



51.0 



32.0 



41.5 



a 



merus .... 



6.1 



13.3 



13.2 



8.5 



11.0 



11 



carpus .... 



4.0 



9.3 



9.4 



5.2 



6.6 



t( 



propodus 



7.7 



17.9 



18.5 



11.1 



14.5 



ii 



dactylus .... 



3.9 



8.5 



8.8 



5.2 



7.0 



(I 



fifth pair of legs 



12.5 



32.0 



32.5 



19.0 



28.0 



a 



propodus . . . 



3.6 



10.7 



10.5 



5.4 



7.4 



u 



dactylus 



0.9 



2.0 



2.1 



1.4 



1.8 



a 



abdomen . . 



34.0 



70.0 



71.0 



47.0 



62.0 



Greatest breadth at second somite . 



14.0 



34.5 



35.0 



21.0 



30.0 



a 



" sixth somite 



7.5 



17.3 



18.0 



11.1 



15.0 



Length of telson .... 



11.0 



23.0 



23.0 



14.8 



20.0 



Breadth of telson .... 



5.7 



12.2 



12.2 



7.9 



10.5 



* In the second, third, and fourth colnmns the measurements of the first pair of 

 legs are taken from the right leg ; in the first and last columns, from the left. In the 

 specimen of which the measurements are given in the fourth column, both legs of 

 the first pair are present and the left one is a little shorter than the right and gives 

 the following measurements : length, 158 mm. ; merus, 47 ; carpus, 31 ; chela, 48 ; 

 dactylus, 28. 



