294 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Genus PISA Leach. 



PISA CARINIMANA Miers. 



Pisa carinimana Miers, Ann. Mag. Nat. Hist. (5), IV, 1879, p. 11, pi. iv, fig. 6 ; Ann. 

 Mag. Nat. Hist. (5), VIII, 1881, p. 207. 



West Africmi localities. — Canary Islands (type locality) ; Goree Bay, 

 Senegambia, 9 to 15 fathoms (Miers). 



Genus MICROPISA Stimpson. 



KEY TO THE WEST AFRICAN SPECIES OF THE GENUS MICROPISA. 



A. Four tubercles in a transverse line on the gastric region. Branchial spines 

 pointed. 



B. Carapace considerably longer than wide violacea. 



B'. Carapace about as long as wide hoeagei. 



A'. Three tubercles in a transverse liue on the gastric region. Branchial spines 

 terminating in a button eryopliora, 



MICROPISA VIOLACEA A. Milne-Edwards. 



Micropisa violacea A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat., IV, 1868, 



p. 50, pi. XVI, figs. 3-6. 

 Serbstia violacea Miers, Ann. Mag. N. H. (5), VIII, 1881, p. 206. 



West African localities. — Cape St. Vincent, Cape Verde Islands (A. 

 Milne-Edwards) ; Goree Bay, Senegambia, 9 to 15 fathoms (Miers) ; 8t. 

 Thomas (Osorio); Loanda (Osorio); Angola (A. Milne-Edwards). 



MICROPISA BOCAGEI Osorio. 



Micropisa hoeagei OsoRio, Jor. Sol. Lisboa, XI, 1887, p. 223. 



West African locality. — Benguela, Angola (Osorio). 



MICROPISA ERYOPHORA Rochebrune. 



Micropisa eryophora Rochebrune, Bull. Soc. Philom. Paris (7), VII, 1883, p. 167. 

 Herbstia eryophora Rathbun, Proc. U. S. Nat. Mus., XVI, 1893, p. 93. 



West African localities. — Mouth of the Gambia and of the Casa- 

 mance (Rochebrune). 



Genus LIBINIA Leach. 



LIBINIA DUBIA Milne-Edwards. 



iiftiwia ^wfeia MiLNE- Edwards, Hist. Nat. Crust., I, 1834, p. 300, pi. xiv bis, tig. 

 2.— Streets, Proc. Acad. Nat. Sci. Phila., 1870, p. 104. 



Range. — Massachusetts to Texas; West Africa (Streets). 



I have recently come to the conclusion that certain forms usually 

 considered varieties of L. dubia are distinct. These are L. distincta 

 Guerin, Capello (not von Martens) andX. rJiomhoidea Streets = L. inflata 

 Streets = L. distincta von Martens (type examined). A specimen of 

 the former is in the United States National Museum from Charlotte 

 Harbor, Florida (Cat. No. 15203, U.S.N^.M.), and of the latter from 

 Meiida, Yucatan (Cat. No. 2169, U.S.N.M.). 



