NO. 1175. TSOPODS OF THE PACIFIC COAST— lilCHAIlDHON. 867 



85. LIGIDIUM HYPNORUM (Cuvier). 



OniscKs hypnorum CuviEU, Journ. d'liist. nat. II, p. 19, pi. 2t). 

 Ligidium hypnorum Budde-Llni>, Naturbistorisk Tidsskrift, 3d 8«'r., VII, 1870, p. 

 225. — Stuxberg, 0fver8i^t af Vetensk. Akad. Forhandl., 187.5, No. 2, j). 48. 



Habitat. — California (Stuxberg). 



86. LIGIDIUM TENUE Budde-Lund. 



IM/idinm tenue Budde-Lund, Crnst. Iso)). Teirestria, 188.5, p. 258. 

 Habitat. — Sitka Island. 



36. STYLONISCUS Dana. 



87. STYLONISCUS GRACILIS Dana. 



StyloniscHx (jracilia Dana, Prof. Acad. Nat. Sci. Phila., VII, 18.54-55, p. 17fi. — 

 Stimi'SON, Journ. Bos. Soc. Nat. Hist., VI, 1857, p. 66. — Budde-Lund, 

 Crust. Isop. Terrestria, 1885, p. 271. 



Habitat. — California. 



VI. EPICARIDEA. 



Family XVI. BOPYKID.^^.i 



Body of female i)rimarily disciform, variously modified subsequently 

 by retrogressive metamorpbosis ; distinctly segmented; more or less 

 asymmetrical, twisted now to rigbt, now to left; dorsal face flattened; 

 bead deeply sunk in tborax and carrying in front two i)airs of rudimen- 

 tary antenna; eyes, wbeu present, aorsal. Maxillipeds lamellar, biar- 

 ticulate, obtecting tbe oral area below, and more frequently exhibiting 

 a small terminal joint, and, at base, two curved lanceolate appendages. 

 Legs, seven pairs, sometimes obsolete on one side, and all of same 

 structure, short, prehensile; coxal plates obsolete or distinctly defined. 

 Incubatory plates, five pairs, more or less arching over the ventral face 

 of the thorax; first pair, as a rule, concealed by second and divided by 

 a transversal fold into two segments. Abdomen more or less distinctly 

 segmented; i)leopoda, forming simple or double lamelke, all of the same 

 structure, rarely obsolete. Uropoda, when present, simple lanceolate. 

 Male elongate, very small, symmetrical; segments of thorax distinct, 

 those of abdomen sometimes distinct, sometimes confluent Mouth parts 

 simide, conic; posterior autennte with flagellum four- articulate; legs 

 of uniform structure; uropoda with inner branch shorter than outer. 

 Parasitic on decapodous crustacea.' 



' Sars, Crustacea of Norway, II, 1898, pp. 195, 196, pis xi, xii. 



^Bopyridie parasitic on Crangon craiu/on (liinuams), Kectocranyon lar (Owen), 

 Nectocrangon alaskensin Kingsley, and other shrimps, have been reserved for more 

 detailed study. 



