32 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Pacific localities subsequently reported, with collectors: Chile: 

 "Chile" (Nicolet); Bahia de Taltal, A. Capdeville (Porter, 1925); 

 Valparaiso, Copenhagen Museum (Rathbun, 1925) ; Tumbes, L. H. 

 Plate (Lenz); Bay of Talcahuano (Porter, 1936b); [Puerto] Montt 

 and Calbuco, L. H. Plate (Lenz) ; Chiloe Island, L. Moreira (Rathbun, 

 1925) ; Puerto Lagunas, Vettor Pisani (Cano, 1889) ; Taitao, Mus. 

 Nac. Chile Exped. (Porter, 1917) ; Port Otway [Puerto Barroso] and 

 Latitude Cove, Albatross (Rathbun, 1898) ; Trinidad Channel, 

 4 fathoms, and Cockle Cove, 2-32 fathoms, Alert (Miers) ; Puerto 

 Bueno, Smith Channel, Hamburger Magalhaensischen Sammelreise 

 (Doflein and Balss) ; Strait of Magellan, Caracciolo (Cano, 1888), 

 Steinman, Pohl, and Gazelle (Ortmann, 1893), 21 and 21.9 fathoms, 

 Albatross (Rathbun, 1898) ; Mayne Harbor, Port Churruca, and Borja 

 Bay, Albatross (Rathbun, 1898) ; Laredo Bay and Sandy Point [Punta 

 Arenas], Albatross (Rathbun, 1898); Sandy Point, 12-15 fathoms, 

 Nassau (Cunningham), 9-10 fathoms, Alert (Miers), L. H. Plate 

 (Lenz), J. B. Hatcher (Ortmann, 1911), Hamburger Magalhaen- 

 sischen Sammelreise (Doflein and Balss) ; Seno Almirantazgo, L. H. 

 Plate (Lenz) ; Elizabeth Island, 6 fathoms, Alert (Miers) ; Nassau Bay, 

 Fuegia, U. S. Expl. Exped. (Dana), "West Patagonia", Magenta 

 (Targioni-Tozzetti, 1872a), "Canali Patagonici", Caracciolo (Cano, 

 1888). For additional localities in the Strait of Magellan see Cunningham 

 (1871) ; for additional localities in Tierra del Fuego see Doflein and 

 Balss (1912). 



Atlantic analogue: None. The species itself occurs at the Atlantic 

 entrance to the Strait of Magellan and in the Falkland Islands. 



Diagnosis: Median frontal tooth a little smaller and less advanced 

 than lateral teeth. Lateral carapace teeth situated below marginal rim. 

 Upper distal tooth of merus of cheliped obsolescent. Dactyls of am- 

 bulatory legs moderately curved. Male first pleopod strongly bent and 

 spirally twisted, a linear row of subterminal setae. 



Description: Carapace distinctly broader than long, ovate, narrowed 

 before ; flat or even depressed, surrounded except the marginal teeth by a 

 sharp rim ; median grooves linear, the branchial groove strongly angled, 

 the gastrocardiac groove bent slightly backward at the middle; a median 

 cardiac groove. Three similar frontal teeth, the median somewhat smaller. 

 Two lateral teeth forming angles below the marginal rim ; the posterior 

 of these teeth well developed and acute ; the anterior smaller and variable, 

 usually obtuse, sometimes acute, sometimes obsolescent on one or both 

 sides. 



