PART 1 garth: pacific oxyrhyncha 51 



Genus EUCINETOPS Stimpson 



Eucinetops Stimpson, 1860b. p. 191. A. Milne Edwards, 1875, p. 119. 

 Miers, 1879c, p. 644. Rathbun, 1901, p. 55; 1925, p. 84. 

 Type: Eucinetops lucasi Stimpson, by monotypy. 



Description: Rostrum small, bifid, little deflexed. Eyes very long, 

 greatly exceeding margins of carapace. Orbits small, encircling only 

 base of ocular peduncles; external angle acute, spiniform; superior 

 margin singly fissured, destitute of teeth or spines. Antennular fossae 

 not deep, margins obtuse and rounded. Basal article of external antennae 

 small, armed with a minute tooth at external angle; movable part 

 depressed, first and second articles rather broad. Epistome very short 

 or lacking. External maxillipeds resembling those of Micippa, but with 

 external angle of merus more prominent, internal angle less sinuous; 

 palpus basally thickened ; exognath exceeding endognath in front. 

 (Stimpson) 



Rathbun (1925) avoids the reference to Micippa as follows: Merus 

 of outer maxilliped subtriangular, outer front angle prominent, distal 

 margin longest ; palpus very short and stout, terminal article much 

 narrower than the others. 



Range: Cholla Bay, Sonora, Mexico, to La Libertad, Ecuador; 

 occurs also in the West Indies (Bahama Banks, Jamaica, Puerto Rico). 

 Two of the three Pacific species are restricted to the Gulf of California 

 and/or adjacent waters. Shore to 1 fathom. 



Remarks: With respect to the Gulf of California Eucinetops two 

 conclusions are possible: either the antennal article is variable and E. 

 rubellula belongs within the E. lucasi series; or else the rostrum is 

 variable, Stimpson's specimens exhibiting the opposite extreme to that 

 shown by Hancock expedition material, and Rathbun's separation of 

 the Stimpson male as E. rubellula was justified. (See following species 

 accounts). If any individuals among the considerable series of E. lucasi 

 showed even a slight tendency toward attenuation of the outer angle of 

 the first movable article of the antenna, the first view might be held. 

 However, all Velero III specimens show an abrupt, horizontal termina- 

 tion of this article and otherwise show little tendency to approach the 

 E. rubellula male. On the other hand, a specimen in the collections of 

 the U. S. National Museum, here proposed as neotype of E. rubellula, 

 upholds the distinctive antennal character and the toothless and gapeless 

 finger of Stimpson's figured specimen (1860b, pi. 2, fig. 3). Available 

 material, therefore, is regarded as corroborating the relationships arrived 



