﻿MARINE ASELLOTE ISOPODS MENZIES 149 



Female operculum,. — Wider than long, beset with marginal setae and 

 bearing a distinct wide median emargination on posterior border. 



Type. — The holotype, the only specimen known, is in the collection 

 of the United States National Mnsenm (No. 89538) . It was collected 

 in the Pacific Ocean, 3 miles off the mouth of Russian River, Calif., 

 31 fathoms depth, from fine green mud, July 13, 1947, Paul Quyle and 

 Richard J. Waidzunas collectors; found with the sea star Luidia 

 foUolata Grube and the isopod Pleurogonium calif orniense Menzies, 

 taken from mud brought to the surface in a fisherman's net. 



Geographical distrihution. — Known only from the type locality. 



Rem^arks. — This specimen to a considerable extent resembles Janira 

 japonica Richardson (1909, pp. 114-115). It appears to differ from 

 that species in having much shorter uropods and in having the dactyls 

 of peraeopods 2-7 triunguiculate, not biunguiculate. 



lANIROPSlS EPILITTORALIS, new species 



FiGUKES 66, 67 



Holotype. — Male, length 3.8 mm., width 1.1 mm. 



Allotype. — Ovigerous, length 2.5 mm., width 0.6 mm. 



Diagnosis. — Frontal margin of cephalon very slightly concave, but 

 having a short medial rostrum. Lateral borders of pleotelson each, 

 with two very inconspicuous spinelike serrations ; a long seta located 

 at posterior base of each serration. Uropods exceed three-fourths 

 length of pleotelson. First antennal flagellum composed of nine 

 (average) articles. Lateral apex of each first male pleopod pointed 

 and directed abruptly posteriorly. 



Character of hody. — Usual color green with numerous scattered 

 black chromatophores. Eyes black in life. 



Pleotelson. — Posterior margin with only a slight indication of a 

 wide median lobe ; acute posterolateral angles lacking. 



Second antenna. — Flagellum with about 66 segments in adult speci- 

 mens. Antenna longer than body. 



Maxilliped. — Palp of male and female similar. 



First maxilla. — Outer lobe with 12 setae, inner lobe with 4 setae. 



Second maxiUa. — Each of the 2 outer lobe lappets with 4 setae, 

 inner lobe with about 12 setae. 



Mandible. — Left mandible incisor with five teeth, lacinia with five 

 teeth, setal row with four plus one setae. Right mandible incisor 

 with five teeth, lacinia lacking, setal row with eight setae. 



Types. — The holotype, allotype, and eight paratypes were collected 

 at the type locality, Dillon Beach, First Sled Road, Marin County, 

 Calif., May 2, 1948, by R. J. Menzies; types found in tide pool on 

 top of Mytilus-coYeTed rock. Additional type material has been de- 

 posited in the following institutions: 



