PART 1 GARTH : PACIFIC OXYRHYNCHA 239 



Size and sex: Males are from 6.4 to 10.8 mm, females from 5.3 to 

 9.0 mm, an ovigerous female 5.6 mm. 



Breeding: The single ovigerous female was collected in late January. 



Remarks: The species characterized above was recognized as new 

 from a male specimen collected by the Velero III in 1939 at Maria 

 Magdalena Island, Mexico, station 970-39. Consultation with the late 

 Steve A. Glassell revealed that he also had collected the species, having 

 obtained a pair in 1940 at Punta Cholla, Sonora, which he proposed to 

 describe as Epialtus paradigmus, using the male as holotype. With char- 

 acteristic generosity, Glassell made his superior specimen available for 

 illustration by Anker Petersen, and shortly before his untimely death 

 granted full permission to publish. Thus the choice of the name was 

 Glassell's, although description and diagnosis are entirely the author's. 



Epialtoides murphyi (Garth) , new combination 

 Plate 26, Fig. 5 



Epialtus murphyi Garth, 1948, p. 24, fig. 2a-e. 



Type: Female holotype, A.M.N.H. No. 10009. 



Type locality: La Plata Island, Ecuador, 5.5 meters, Askoy sta- 

 tion 80. 



Localities subsequently reported, with collectors: Known only from 

 the type locality above, and from Gorgona Island, Colombia, 4-7 meters, 

 Askoy station 89 (Garth). 



Atlantic analogue: None. 



Diagnosis: Rostrum bilobed, preorbital lobe prominent. Hepatic lobe 

 larger than branchial, anterior margins horizontal and minutely dentate. 

 Carapace posteriorly eroded, two tubercles at gastric level. Legs cristate, 

 propodal tuft absent. Hand tuberculate in female ; male unknown. 



Description : Carapace broad as long, widest at hepatic level, smooth 

 anteriorly, eroded posterior to cardiac and branchial regions. Front pro- 

 duced, length equaling or exceeding width, sides tapering, tip bilobed, 

 thickened, and hollowed beneath. A prominent preorbital lobe and a 

 minute postorbital denticle. Hepatic margins anteriorly horizontal, bear- 

 ing three or four setose tubercles, laterally broadly rounded. Branchial 

 lobes sharper, culminating in a nonsetose tubercle; branchial width 

 almost equaling or exceeding hepatic width. Regions slightly elevated 

 and obscurely defined except for cardiac and gastric; these rounded, ele- 

 vated, and together forming a low median ridge occupying about one- 

 third of the carapace. Gastric region bearing a pair of low tubercles in 

 advance of its summit. 



