Cerapiis, TTnciola, and Lepidactylis. 2^7 



The only known species inliabits unattached, portable tubes, and, 

 as in many allied genera, has large cement glands in the bases of the 

 fii'St and second pera^opods. 



Cerapus Say. 



Say, Jour. Acad. Nat. Sci. Pliiladelpliia, i, p. 49, 1811 (tuhularis the only species.) 



Desmarest, Dictionnaire Sci. nat., xxviii, p. .358, 182,3 ( = Say). 



Latreille, In Ctivier, Regne animal, iv, p. 122, 1829 (=Say.) 



Milne-Edwards, Ann. Sci. nat., Pari.s, xx. p. 383, 1830 ( = Say); Hist. nat. Crust., iii, 



p. 60, 1840 (in part.) 

 Dana, Amer. Jour. Sci., II, viii, p. 139, 1849, and xiv, p. 309, 1852 ( = Say); Crust. 



United States Expl. Expd., p. 832, 1853 (=:Say). 

 Bate, Catalogue Amphip. Crust. British Mus., p. 262, 1860 (in part). 



Cerapus tubularis Say. 



Say, Jour. Acad. Nat. Sci. Philadelphia, i, p. 50, pi. 4, figs. 7-9, 1817. 



Desmarest, Dictionnaire Sci. nat., xxviii, p. 358, pi. 46, figs. 2a-2e (after Say), 1823 



(=Say); Consid. gener. Crust., p. 271, pi. 46, figs. 2a-2e (=last), 1825 ( = Say). 

 Audouin, Precis d'Entomologie, pi. 28, figs. 5-7 (after Say), 1828 ( = Say). 

 Guerin, Iconographie du Regne animal. Crust., pi. 27. fig. 4, (after Say). 

 Milne-Edwards, Regne animal de Cuvier, 3™« edit , pi. 61, fig. 5-5c (after Say), 1837 ; 



Hist. nat. Crust., iii, p. 60, pi. 29, fig. 15 (after Say), 1840 (=Say). 

 Bate, Catalogue Amphip. Crust. British. Mus., p. 262, pi. 45, fig. 1 (after Say), 1862 



(=Say). 

 Smith, Inverteb. Animals Vineyard Sound, Report U. S. Comra. Fish and Fisheries, 



parti, p. 565 (271), 1874. 



Plate Ila. 

 Great Egg-Harbor, "NTew Jersey (Say). Vineyard Sound, among 

 masses of a large compound ascidian [Amour oucium, pelluf^dwii)^ in 

 8 to 10 fathoms, oiF Nobska Point, June 27, 1871 ; several females, 

 some of them carrying eggs. Vineyard Sound, 1 875 ; one specimen. 

 Taken in the towing net, among eel-grass (Zostera), in Noank Har- 

 bor, Connecticut, July 17 and 21, 1874 (A. E. Verrill); males, females, 

 and young, many of the females carrying eggs. 



The genus Cerapus being restricted to the type species and re- 

 moved from the Podocerinae, as above, Milne-Edwards' Ericthonms 

 appeal's to be the proper name to restore and retain for the grouj) of 

 species referred to Cerapus by recent authors. 



Ericthonius. 



Ericthonius M.-Edwards, Ann. Sci. nat, Paris, xx, p. 382, 1830 {difformis the only 

 species); Hist. nat. Crust., iii, p. 59, 1840 [difformis only). 

 Dana. Amer. Jour. Sci., II, viii, p. 138, 1849, and xiv, p. 309, 1852; U. S. Expl. 

 Expd., Ci'ust., p. 8.''.2, 1853 (Erir.htlio lius). 



