Cerapus^ Tfnciola, and Lepidactylis. 279 



Ikicihonius difformis Milne-Edwards — (continued). 



Dercothoe {Cerajjv^) punctatus Bate, Catalogue Aniphip. Crust. British Museum, p. 



260, p. 44, fig. 10, 1862 ( S ). 

 Dercothoe ( Cerapus S ) punctatus Bate and "Westwood, British Sessile-eyed Crust., i, p. 

 461 (fig.), 1863 (2). [" Milne-Edwards, MS. in Brit. Mus." is quoted as au- 

 thority for the name as here used.] 

 ? Czerniavski, Materialia ad Zoographiam Ponticam comparatam ; p. 96, 1868. 

 Cerapus difformis Bate, Catalogue Amphip. Crust. British Museum, p. 265, pi. 45, 

 fig. 5, 1862. 

 Bate and Westwood, op. cit., p. 457 (figs.), 1863. 

 Norman, Report British Assoc. Adv. Sci., 1868, p. 283, 1869. 

 Metzger, Jahresbericht der Comm. zur wissensch. Untersuchung der deutschen 



Meere ffir 1872-3, Nordsee, p. 278, 1875. 

 Boeck, Christiania Videnskabs-Selskabs Forhaudlinger, 1870, p. 250 (170); Scan- 



dinav. og arktiske Amphip., p. 615, 1876. 

 Meinert, Natiu-h. Tidsskrift, III, xi, p. 157, 1877. 

 Cerapus Leachvi Bate, Catalogue Amphip. Crust. British Museum, p. 268, 1862 



(= Kroyer). 

 Cerapus Uunteri Bate, Catalogue Amphip. Crust. British Museum, p. 264, pi. 45, 

 fig. 3, 1862 (habitat unknown). 

 Boeck, Christiania Videnskabs-Selskabs Forhandlinger, 1870, p. 252 (172), 1871 

 (Scandinavia); Scandinav. og arktiske Amphip., p. 618, pi. 28, fig. 5, 1876. 



Vineyard Sound !, 1871, not common. OIF Cape Cod !, 29 fathoms, 

 1879. Stellwagen's Bank! and Jeffrey's Ledge!, 1873. George's 

 Banks !, 50 fathoms, sand and sliells, and 45 fathoms, coarse sand, 

 1872. Casco Bay !, 9 to 34 fathoms, 1873 ; common. Bay of 

 Fundy !, low-water mark to 50 tathoms, abundant, especially on hard 

 bottoms, 1868, 1870, 1872, 1876 ; and, in 1872, ofi' Head Harbor, 77 

 fathoms, miid and stones; and off White Head, Grand Menan, 97 to 

 105 fathoms, gravel and stones. Halifax, Nova Scotia!, 16 fathoms, 

 rocky, 1877. Straits of Belle Isle, Labrador, (Packard). Spitzbergen, 

 (Goes). Scandinavia, (Kroyer, Liljeborg, Boeck, et al.) British 

 Isles!, (Norman). Brittany, France, (M. -Edwards). It is reported 

 from the Mediterranean by Costa, and from the Black Sea by 

 Czerniavski, (as Bate's Dercothoe {Cerapus 'i) j^^ai-ctattis), but these 

 identifications are, perliaps, erroneous. 



The form of the second pair of gnathopods of the adult male varies 

 very miicli in different specimens. When farthest differentiated from 

 the form characteristic of the female and young, the carpus is triangu- 

 lar, and tlie spine of the inferior margin very long and separated from 

 the propodal articulation by a deep, triangular sinus, while the pro- 

 podus is slender, nearly cylindrical, and without prominences on the 

 inferior edge. This is the form wliich I have floured in the work 

 above referred to, and is apparently very near that figured by Milne- 



