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EXPLANATION OF PLATES. 



PREFATORY REMARKS. 



After the engraving of the Plates of this Atlas was completed, a large part of the original drawings were destroyed by fire 

 in Philadelphia. In consequence of this catastrophe, many of the following Plates, which were to have been coloured from 

 the missing drawings, are issued uncoloured. Some of the figures here engraved represent known species, the colours of which 

 had either not been given by other authors, or only from dead and faded specimens : as the coloured originals are gone, these 

 figures have lost the principal part of their interest. These facts explain some discrepancies between the text of this Report 

 and the Atlas. 



The drawings for this Atlas, issued at this late date, were to a large extent made during the years 1838 to 1842, in the 

 course of the cruise of the Expedition ; and in the history of the Science, they would properly have their place in that period. 



In closing my labours in connection with the Exploring Expedition, I take this opportunity to observe that, in the pre- 

 paration of my several Reports, and the Atlases, with which they are illustrated, I have had, half a dozen plates excepted, 

 neither the assistance of an amanuensis nor a draftsman. The plates, however, owe much to the artistic skill and taste of Mr. 

 Joseph Drayton, Artist of the Expedition, who has superintended the engraving and printing, and contributed in many ways to 



the beauty of the work. 



JAMES D. DANA. 



New Haven, January 1, 1855. 



I. DECAPOD A. 



PLATE 1. 



Fig. 1 a. Hyas lyeatus, male, natural size ; b, under view of 

 head, enlarged ; c, abdomen, natural size ; d, extremity of poste- 

 rior leg. — p. 8G. 



Fig. 2 a. Pisoides Edwardsii, under view of head, much en- 

 larged; b, outer maxilliped. — p. 87. 



Fig. 3 a. Libidoclea coccinea, male, natural size ; b, posterior 

 view of carapax ; c, under view, showing mouth and inner an- 

 tennae, magnified two diameters ; d, male abdomen. — p. 88. 



Fig. 4 a. MiClPPA HIRTIPES, female, enlarged ; b, front view of 

 front or beak, enlarged four diameters ; c, female abdomen ; d, 

 under view of head; e, hand of female. — p. 90. 



Fig. 5 a. Ciiorilia longipes, female, natural size ; b, under 

 view; c, side view of anterior part, enlarged four diameters; d, 

 female abdomen. — p. 91. 



PLATE 2. 



Fig. 1 ft. Lahaina ovata, male, enlarged three diameters ; b, 

 orbital margin and eye (1 (to right), base of beak ; 2, apical 



spine of base of outer antennas; 3, praoorbital spine; 4, eye; 5, 

 posterior part of orbit) ; c, under view of head ; d, hand ; e, 

 papilla of posterior part of carapax; /, papilla of the apex of 

 the third joint of one of the legs. — p. 93. 



Fig. 2 a. Scyra Acutifrons, natural size ; b, under view of 

 head; c, hand; d, female abdomen. — p. 95. 



Fig. 3. Pyria pubescens, enlarged. — p. 96. 



Fig. 4 a. Mithrax Asper, male, from East Indies, natural size ; 

 b, under view of head. — p. 97. 



Fig. 5 a. Cyclax Perryi, enlarged ; b, under view of head, 

 —p. 99. 



Fig. 6 «. Eurypodius Septentrionalis, enlarged two diameters ; 

 b, outer view of right hand, natural size ; c, extremity of second 

 pair of feet, natural size; d, male abdomen, natural size. — p. 101. 



Fig. 7 a. Eurypodius brevipes, female, natural size ; b, abdo- 

 men; c, under view of head. — p. 103. 



PLATE 3. 



Fig. 1 a. Eurypodius Latreillii, under view of anterior part, 

 enlarged four diameters; b, outer view of right hand; c, extre- 



