PART 1 GARTH : PACIFIC OXYRHYNCHA 463 



Leiolambrus punctatissimus, Holmes, 1900, p. 46. Rathbun, 1925, p, 

 543, pi. 198, text-fig. 149. Finnegan, 1931, p. 626. Garth, 1948, 

 p. 32. 



Type: Male holotype, length 12.7 mm, width 14.8 mm, not extant. 



Type locality: Coast of California; Lieut. Belcher, collector. In all 

 probability, Lower California, as presently recognized. (See Remarks 

 below. ) 



Localities subsequently reported, with collectors: "California" (Co- 

 penhagen Museum), (Rathbun, 1925). Gulf of California: Mexico: off 

 Guaymas, 20 fathoms, Albatross (Holmes, 1900), and off La Paz Bay, 

 26.5 fathoms, Albatross (Rathbun, 1925). Colombia: Solano Bay, 36-54 

 m, Askoy (Garth) ; Gorgona Island, 20 fathoms, St. George (Finne- 

 gan). Ecuador: off Esmeraldas, 36-54 m, Askoy (Garth). 



Atlantic analogue: Leiolambrus nitidus Rathbun. 



Diagnosis: Carapace smooth and convex dorsally; gastro-cardiac and 

 branchial areas linear, separated by a longitudinal sulcus. Two pairs of 

 posterior marginal teeth ; margins between outer pair and lateral teeth 

 concave; lateral teeth longest. Margins of manus denticulate, hairy; 

 dactyls directed along same axis. Male first pleopod slender, cylindrical, 

 straight, open basally, deeply emarginate distally, a row of setae on lip 

 of groove ; other setae in linear rows and in clusters, especially about tip. 

 Male second pleopod only half the length of first, base bulbous, tip 

 bluntly pointed, subterminally denticulate. 



Description: Carapace smooth, convex, minutely punctate, the median 

 and cardiac regions forming a nearly continuous longitudinal elevation, 

 bounded on either side by a conspicuous, longitudinal depression. Front 

 truncated, having a small, median tooth, behind this the upper surface 

 marked with a short, longitudinal groove. Postorbital angle acute. 

 Anterolateral margins long, slightly arcuated, and furnished with teeth 

 becoming very small toward the anterior end. Sides of the carapace 

 produced into a prominent, triangular tooth. Two teeth on the posterior 

 margin near the middle line ; external to these a pair of larger marginal 

 teeth; the margins between the external pair and the lateral angles of 

 the carapace concave. The whole posterior margin of the carapace 

 marked with a delicate, raised, jagged line; another fine raised line 

 running upon the branchial regions from the external tooth of the pos- 

 terior margin. Maxillipeds smooth, the ischium slightly narrowed dis- 

 tally, the anterointernal angle produced forward into a rounded lobe; 

 merus broadly rounded at the anteroextemal angle and produced below 

 the articulation of the palp. 



