OXYSTOMATOUS AND ALLIED CRABS OF AMERICA Ql 



ANALOGOUS SPECIES OF ETHUSINA ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic 



abyssicola. 



Pacific 

 srnithiana. 



ETHUSINA ABYSSICOLA Smith 



Figure 21; Plate 26, Figure 1; Plate 27, Figure 1 



Ethusina abyssicola Smith, Rept. U. S. Comm. Fish and Fisheries for 1882, 

 p. 349 [5], pi. 2, fig. 1, la, 1884 (type locality, off Nantucket Shoals, 1,731 

 fathoms; types U.S.N.M. no. 7119, and in P.M.Y.U.); ibid., for 1885, 

 p. 635 [31], 1886.— Bouvier, Bull. Soc. Philom. Paris, ser. 8, vol. 9 (1896- 

 1897), p. 66 [13], 1898; Rcsultats de campagnes scientifiques . . . Monaco, 

 vol. 62, p. 53, pi. 2, fig. 1 (col.), 1922. — A. Milne Edwards and Bouvier, 

 Crustaces decapodes provenant cles campagnes du yacht V Hirondelle 

 (supplement) et de la Princesse- Alice, fasc. 13, p. 18, 1899; Expeditions- 

 scientifiques du Travailleur et du Talisman, 1880-1883, pt. 1, Crustaces, 

 Decapodes, p. 29, pi. 1, fig. 6 (col.), 1900. 



Ethusa {Ethusina) abyssicola Doflein, Wissenschaftliche Ergebnisse der deutsch- 

 en Tiefsee-Expedition . . . Valdivia, 1898-1899, vol. 6, p. 31, pi. 13, figs. 1, 

 2, 1904. 



Ethusina abyssicola iypica Ihle, Zool. Anz., vol. 46, p. 360, 1916; Die Decapoda 

 Brachyura der >Si6ogra-ExpedItion, monogr. 39b', p. 147, 1916. 



Diagnosis. — Outer orbital tooth directed outward, not overreach- 

 ing eye. Dactyl of second ambulatory sensibly longer than that of 

 first. 



Figure 21.— Ethusina abyssicola, male: a, Dorsal view, natural size; 6, front and oral region, X2. After 



Smith. 



Description. — IVIale. Carapace at branchial regions as broad as 

 the length to middle of front, but much narrowed anteriorly, the 

 breadth of front being about three-eighths of length. Submedian 

 teeth of front triangular, slightly upturned and separated by a tri- 

 angular sinus broader and deeper than the rounded antennular 

 sinuses, while the lateral teeth are spiniform and longer than the 

 middle teeth but more strongly upturned, so that they scarcely pro- 

 ject in front of them. Surface of carapace pubescent, granulate, 

 and areolated similar to Ethusa microphthalma, the cardiac region 

 being broadly open in front. Eyestalks stout, reaching very slightly 

 beyond the minute postorbital teeth, and bearing at the tips black 

 eyes much smaller than the diameter of the stalks. 



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