64 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



Birge (Studies from Biological Laboratory, Johns Hopkins Univ., 

 Vol. II, No. 4) gives the following characteristics of the different 

 stages : 



"First Zoea.— (PI. VII, Fig. 28) In larval skin. 



"Second Zoea.— (PL VII, Fig. 29) Moulted from the larval skin, 

 four swimming hairs. 



"Third Zoea. — (PI. VII, Fig. 30) Six swimming hairs. Fh-st ap- 

 pearance of abdominal legs under skin. Long spine on fifth abdomi- 

 nal segment. 



"Fourth Zoea. — (PI. VII, Fig. 31) Eight or more swimming hairs. 

 External abdominal legs. Spines on anterior abdominal segments. 



"Last Zoea. — Twelve or more swimming hairs. Divided telson. 

 Mandibular palpus. 



"First Megalops. — (PI. VII, Fig. 32) Immediately after moult from 

 last zoea. All the long spines are entirely lost. The carapace be- 

 comes vertically flattened. The telson loses its fork and becomes a 

 simple plate. 



"Fu'st Crab. — Three spines on each side of the carapace. An- 

 chylosed segment for fifth walking leg." 



(Genus) EUPANOPEUS Rathbun. 



Eupanopeus herbstii Milne Edwards. "Mud Crab." 



Plate II. Figure 5. 



Panopeus herbstii Milne Edwards. Verrill and Smith, 1874. 



Panopeus herbstii Milne Edwards. Benedict and Rathbun, 1891. 



In E . herbstii the carapace is subquadrate. The front is of 

 moderate width and has sinuous lobes. It is slightly larger than the 

 preceding species. The anterolateral teeth point slightly forward. 



Habitat: on oyster beds in brackish waters. 



Distribution: Cape Cod to Gulf of Mexico. 



Economic value: food for fishes. 



