68 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



carapace is slightly broader than long, and has the anterolateral 

 margin cut into five acute teeth. The color is green with occasional 

 blotches of yellow. 



Habitat: under stones toward high-water mark to a few fathoms. 



Distribution: Atlantic coast to North Carolina. 



Economic value: edible. 



Season in Rhode Island: 



When are the eggs laid and, how long after copulation? 



How long does the female carry the eggs? 



Extent of hatching season: 



LARVAL FORMS. 



The following is a brief summary of pages 140, 141, and 142 of 

 Williamson's paper: 



"On the Larval and Early Young Stages and Rate of Growth of the 

 Shore-crab. {Carcinus meanas Leach.)," by H. C. Williamson, 21st 

 Annual Report of the Fishery Board of Scotland. 



"The Zoea of Carcinus msenas is readily distinguished from the 

 other Zoea by — (1) The absence of the lateral spines of the carapace. 

 Many of the other common Brachyura have a strong lateral spine 

 on the carapace. (2) The colouration. The zoea of Carcinus has 

 to the naked eye a greenish or olive appearance. (3) The structure 

 of the abdominal joints. The lateral part of the terga of the 2-5 

 abdominal segments extends backwards in the first zoea in a rounded 

 expansion over the beginning of the succeeding segment. The pos- 

 terior edge of this plate is minutely notched. 



"A useful character for separating the different stages is the num- 

 ber of setae on the exopodite of the first or second maxilliped, but 

 this is not constant. 



"In the I Zoea (PI. VII, Fig. 33) there are 4 setae. 



"In the II Zoea (PI. VII, Fig. 34, there are 6 setae. 



"In the III Zoea (PI. VII, Fig. 35) there a 8 setae. 



"In the IV Zoea (PI. VII, Fig. 36) there are 10 seta. 



