STATISTICAL BIOLOGICAL STUDY. 67 



moenas, Weldon, '93, Pearson, '94; various dimensions, Cran- 

 gon, Weldon, '90; length of rostrum, Palaemon serratus, 

 Thompson, '94, Pearson, '94; number of rostral teeth of 

 PalaBinonetes, Weldon, '92 b , Pearson, '95, Duncker, '00. 



Lot. A, mm. n, mm. C, % 



Eupagurus, short edge of R. chela: 



$ deep water 9. 708 .085 2.76 28.5 



$ shallow water 10. 272 .075 2.59 25.2 



? deep water 7. 400 .033 1.06 14.3 



$ shallow water 7.485.029 1.02 13.6 



Eupagurus, long edge of R. chela: 



$ deep water 17. 97 .14 4.73 27.8 



$ shallow water 18. 68+. 13 4.38 23.5 



? deep water 14.14.06 1.67 11.9 



9 shallow water 13. 97 .05 1.82 13.0 



Eupagurus, carapace length: 



$ deep water 8. 59 .05 1.67 19.4 



$ shallow water 7. 54 .03 0.94 12.5 



? deep water 7.12.03 0.86 12.1 



Palaemonetes vulgar is, dorsal spines . 8.28 0.81 9.83 



ventral spines. 2.98 0.45 15.03 



Palaemonetes, varians, dorsal spines . 4.31 0.86 20.00 



ventral spines. 1.70 0.48 28.26 



Amphipoda. Seriations of lengths of body, of second 

 antennse, and of ratio of second antenna? to body-length, 

 Smallwood, '03. 

 Annelida. 



Chcetopoda. Teeth on jaws of Nereis virens. Right: A = 

 10.055 .045, o= 1.339 .032, (7=13.3%; Left: A = 10.00 

 .044, <7=1.306.031, (7=13.1%, Hefferan, '00. 

 Brachiopocla. 



Seriation of widths breadth, width of sinus -f- depth, num- 

 ber of plications on ventral and dorsal valves in sinus and on 

 fold, Cummings and Mauck, '02. 

 Bryozoa. 



Number of spines on statoblasts of Pectinatella magnifica. 

 A = 13.782.031, o= 1.318 .022, C=9.57.16, Davenport, 

 '00. 

 Moll u sea. 



Gastropoda. Frequency polygons of ventricosity, weight, 

 and index of Littorina littorea for 3 British and 10 American 

 localities greater variability in America. Index: <7=2.3%, 



