PART 1 GARTH : PACIFIC OXYRHYNCHA 69 



Type locality: The locality cited by Bell, Galapagos Islands, 6 

 fathoms, sandy mud, H. Cuming, collector, is considered erroneous 

 (See Remarks below). In view of this circumstance, and in keeping with 

 the Copenhagen Decisions in Zoological Nomenclature (1953, p. 27, 

 par. 2), the type locality is hereby corrected to Salango Island, Ecuador, 

 a mainland locality at which Cuming is known to have made collections, 

 and from which the species has been subsequently recovered. 



Localities subsequently reported, with collectors: Panama: Pinas 

 Bay, 14-33 meters; Guayabo Chiquito, 24-64 meters; Colombia: Ardita 

 Bay, 34-43 meters; Ecuador: Off Cape Pasado, 18 meters; all specimens 

 collected by the Askoy Expedition (Garth, 1948). 



Atlantic analogue: None. 



Diagnosis: Rostrum minute, bifid. Carapace convex, covered with 

 bead tubercles largest and most distinct on branchial regions. Median 

 spines lacking; a conical tooth on first abdominal segment of male. 

 Postorbital spine large, blunt, smooth, anterior margin straight or 

 convex. Basal antennal article with a granulate ridge. Merus of third 

 maxilliped cordiform. Male first pleopod with five or six longer spines 

 near apex, lip of orifice contoured, not protruding. 



Description: Carapace broadly pyriform, gibbous, rounded; regions 

 elevated, and separated by rather deep furrows; surface covered, parti- 

 cularly on each branchial region, with numerous distinct rounded 

 tubercles resembling very minute pearls. Rostrum very small and bifid. 

 Orbits wide, and with a hollow at the outer side for lodgment of eyes 

 when at rest, though not deep enough to conceal them entirely. Small 

 fissure dividing the upper margin of the orbit from the rostrum, and 

 another externally from the tooth of its outer angle. Eyes larger than 

 their peduncles. 



External antennae half as long as body, [basal article] as long as 

 rostrum, with a tooth at the outer angle. Internal antennae [antennules] 

 lodged in a single cavity, open in front, bounded above by rostrum, and 

 on each side by the [basal article] of the external antennae. [Maxil- 

 lipeds] resembling those of Camposcia except for the [merus] of the 

 [endognath] being more heart-shaped, and deeply notched for the at- 

 tachment of the long and greatly developed movable palp. 



Abdomen of the male with seven [segments] [this is not borne out 

 by the illustration], each having an elevation in the center: the first, 

 wholly apparent when viewed from above, somewhat quadrate, with a 

 small tubercular tooth in the center; the second very short; the third 

 much broader than the rest, and the remainder abruptly narrower. 



