81 



APPENDIX B. 



DESCRIPTION OP THE "DRILL" REFERRED TO IN THE REPORT OP THE OPERATIONS DURING 



THE SEASON OP 1878. 



By W. H. Dall, Asst. C. & G. Survey. 



Only a few specimens were preserved, and hence it is impossible to speak positively in regard 

 to its distinctness from the allied forms Astyris spizantha (Eav.) and A. lunata Dall (Ex. Say). 



It differs from the former, so far as the specimens go, in color, pattern, and solidity, having 

 also more whorls and a more slender form. 



It differs in form very much from southern specimens of A. lunata, but more specimens of each 

 are needed to determine the limits of variation in these small shells. They belong to a group 

 known to be extremely variable. 



It may for the present be denominated by the varietal name Astyris var. Winslovii in com- 

 memoration of its discoverer. 



Though known to be carnivorous, no species of the genus Astyris has been recorded until now 

 as an injurious animal. 



APPENDIX C. 

 Table showing number and class of dredging vessels seen from the Palinurus during the season of 1878. 



Oct. 



1878. 

 Sept. 18 

 19 

 20 

 20 

 23 

 25 

 26 

 29 

 30 

 1 

 3 

 3 

 3 

 3 

 3 

 3 

 4 

 4 

 4 

 4 

 4 

 4 

 7 

 14 



57 



43 



51 



61 



123 



85 



104 



65 



20 



37 



26 



20 



16 



14 



25 



63 



115 



17 



6 



30 



79 



112 



210 



210 



Ground on -which at work. 



Pocomoke Sound 



do 



Southern part Tangier Sound 



Pocomoke Sound 



Southern part Tangier Sound 



do 



do 



Middle part Tangier Sound 



Manokin Kiver 



On the "Great Rock " 



On Harris' Bed 



On Terrapin Sands 



On Muscle Hole 



On Piney Island Bar 



Manokin Elver 



On and above Chain Shoal 



Above Diel's Island 



On Muscle Hole Bed 



On Terrapin Sands 



Southern part Tangier Sound 



Harris' Bed and Manokin Kiver 



North of Little Island 



Upper Tangier Sound 



do 



946 



714 



2,142 



1,013 



5,166 



3,570 



4,368 



2,730 



332 



1,554 



1,092 



840 



266 



588 



415 



1,046 



1,909 



282 



252 



1,260 



3,318 



1,859 



6,090 



6,090 



432, 684 



1, 043, 532 

 721, 140 

 882, 336 

 551, 460 



313, 908 

 220, 584 

 169, 680 

 53, 732 

 118, 776 



56, 964 



50, 904 



254, 520 



670, 236 



The classification of the dredging vessels is the result of, and dependent upon, actual obser- 

 vations. It was noticed that those vessels usually at work in a particular locality were generally 

 of a certain rig and tonnage, and where there was a dissimilarity in that respect, we recorded, 

 when in the locality, the proportion of large and small vessels and of different rigs. In compiling 

 the table the dredging vessels have been separated into three classes. 



The first class represents large and small vessels 5 the average "take" of this class was 42 

 bushels per vessel. 

 App. 11 11 



