166 Addison E. Verrlll, 



Figure 2. Trachypcnccus constrictus. Female, from Virginia; side view, 

 x about 2; 2a, rostrum and edge of carapace. 



Figure 3. The same; leg of first pair; x about 13. Original. 

 Figure 4. The same ; thelecum. 



Figure 5. The same; petasma of male; much enlarged. 

 Figures i-ia, 2, 2a, 4, 5, are after M.-Edw. and Bouvier. 



PLATE XVI. 



Figures I, 2. Pen&us brasiliensis ; anterior parts and rostrum of two 



specimens ; 2a, telson, enlarged. By J. H. E. 

 Figure 3. Penaopsis goodei; type, from Bermuda ; side view of the 



carapace and frontal organs, enlarged. 

 Figure 4. Parapeneus velutinus; male ; after Dana. 

 Figure 5. Latreutes fucorum; from Bermuda; scaphocerite x 20; 53, 



telson and uropods, x 20; sb, leg of third pair, x 20. By A. H. V. 

 Figure 6. Processa canaliculata; variety bermudensis, from Bermuda ; 



base of antenna and the scaphocerite ; 6a, leg of second pair, with 



canaliculate ischium; 6b, mandible; after Bate. 



Figure 7. Gnathophylluin ainericanttm ; frontal parts, after Guerin. 

 Figures I, 2 and 3 are originals by J. H. Emerton ; 5-sb, by A. H. V. 



PLATE XVII. 



Figure I. Leucifer faxoni. Male. General view of anterior portion of 

 body and head; legs are mostly omitted; mp", second maxillipeds ; 

 mp"', third maxillipeds; i', leg of first pair; p', first pleopod, with 

 the petasma, pt ; p", second pleopod, with the male organ, v ; p'", 

 third pleopod; X2O.. 



Figure 2. The same ; side view of the head of another example, a', 

 antennule; a", antenna; s, scaphocerite; X2S. 



Figure 3. The same. Male ; distal part of 6th abdominal segment, with 

 uropods, u ; and telson, t ,x 20. 



Figure 4. The same ; uropod of another example ; x 20. 



Figure 4a. The same specimen ; telson, more enlarged. 



Figure 6. The same; outline of petasma, x 32. Figures 1-6 original, by 

 the author. 



Figure 7. Petasma of a specimen from off Chesapeake Bay, after Faxon. 



Figure 8. Leucifer affinis Borr. (L. typus, after Bate) ; c, carapace; g", 

 g"', second and third maxillipeds; i', i"', legs of first and third pair; 

 p', p", first and second pleopods ; m, petasma or clasping organ on 

 p' ; u, uropods; t, telson; 8a, side view of frontal parts of the same, 

 more enlarged; a', antennule; a", antenna; s, its scale; ot, ootocyst; 

 8b, petasma ; 8c, tip of third leg ; 8d, second pleopod of male. 



