OXYSTOMATOUS AND ALLIED CRABS OF AMERICA Q3 



are retractile against sides of carapace. Eyestalks long, composed 

 of two joints, a slender basal joint, and a swollen terminal joint that 

 carries the eye; terminal joint nearly as long as basal. Second 

 article of antenna 1 peduncle having its antero-external angle produced 

 in a spine. Palate distinctly delimited from epistome everywhere 

 except in middle line; expiratory canals well defined. External 

 maxillipeds subpediform. Chelipeds rather slender and generally 

 somewhat spiny. Legs long, more or less compressed and spiny, the 

 last pair reaching to end of carpus of preceding pair, and subcheliform, 

 the propodite dilated near the basal end and never twice length of 

 dactylus. Abdomen of both sexes rather broad, consisting of seven 

 separate segments. Gill plumes 14 on either side; epipodites on 

 chelipeds and first two pairs of legs. 



East and west coasts of America; eastern North Atlantic and 

 Mediterranean ; Indo-Pacific. 



The substitution of Thelxiope for Homola is called for under the 

 International Rules of Zoological Nomenclature. Thelxiope pre- 

 cedes Homola by a year. Rafinesque's definition is above question. 

 His description of the type species also certainly applies to the 

 barbata of Fabricius. The name Thelxiope has been mentioned by 

 Desmarest,'° Roux," Cuvier,'^ White," and Stebbing '* as synonymous, 

 or probably synonymous, with Homola, but so far no one has used 

 the weapon of priority to do justice to Rafinesque's genus. 



KEY TO THE AMERICAN SPECIES OF THE GENUS THELXIOPE 



Ai. Rostrum bidentate barbata (p. 63) 



A'. Rostrum a single spine vigil (p. 66) 



THELXIOPE BARBATA (Fabricins) 



Figure 16; Plate 15, Figures 1, 2 



Cancer barbatus Fabricius, Entomologia systematica, vol. 2, p. 460, 1793 (type 

 locality, Bay of Naples; type not located). — Herbst, Versuch einer Natur- 

 geschichte der Krabben und Krebse, vol. 2, p. 166, pi. 42, fig. 3 (col.), 1796. 



Thelxiope palpigera Rafinesque, Precis des ddcouvertes et travaux somiolo- 

 giques, p. 21, 1814. 



Doripe spinifrons Lamarck, Histoire naturelle des animaux sans vertSbres, vol. 

 5, p. 245, 1818 (type locality, Mediterranean; type in Paris Mus.). Synonym, 

 D. fronticornis Lamarck, MS. 



Homola spinifrons Leach, Trans. Linn. Soc. London, vol. 11, p. 324, 1815, 

 (type locality not given); Zoological miscellany, vol. 2, p. 82, pi. 88, 1815. — 

 Desmarest, Considerations g6n6rales sur la classe des Crustacds, p. 134, 

 pi. 17, fig. 1, 1825. — Milne Edwards, Histoire naturelle des Crustaces, 

 vol. 2, p. 183, pi. 2, fig. 1-4, 1837; in Cuvier, Rdgne animal, Crustacea 

 (Disciples' ed.), p. 102, pi. 39, fig. 2 (col.)-2b, 1837. 



" Desmarest, Considerations g6n6rales sur la classe des Crustacfs, p. 134, 1825. 



•1 Roux, Crustaces de la Mediterranfe et de son littoral, p. 85, 1828. 



" Cuvier, Le regne animal, ed. 2, vol. 4, p. 68, 1829. 



" White, List of the specimens of Crustacea in the collection of the British Museum, p. 55, 1847. 



" Stebbing, South African Crustacea, pt. 2, p. 22, 1902. 



