310 AMPniPODA NORMALIA. 



at the middle. Antennae inserted in lover side of cephalon, short, 

 five- to seven -jointed, joints ;ill short. Gnathopoda quite small ; 

 carpus of second pair not oblong, finely serrulate below, lower 

 apex produced and triangular, acute ; meros hardly smaller and 

 not transverse ; propodos on the inner side minutely setulosc. 

 First and second pairs of pereiopoda subequal, scarcely shorter 

 than the following pairs ; third and fourth pairs subequal ; fifth 

 pair very short, the coxa of moderate size, the following part but 

 slightly longer. 

 •' Length 3 lines. 



" Hah. In the Pacific, latitude 2P S., longitude 175° W. Collected 

 March 30th, 1841, attached to Medusae." — Dana. 



3. Dairinia depressa. (Plate L. fig. 5.) 



Daira ? depressa, Dana, U. S. Explor. Expecl. p. 992. pi. 68. f. 4. 



" Body depressed, broad. Cephalon seen in profile, or from above, 

 transversely hemispherical. Segments of pereion subequal. An- 

 tennae very small, four -jointed, third joint longer than second. 

 Gnathopoda nearly naked, small ; carpus of second pair transverse, 

 serrulate below, nearly square, with the lower angle triangularly 

 prolonged ; anterior margin entire. First and second pairs of 

 pereiopoda long, subequal ; third and fourth pairs subequal, basa 

 broad ; fifth pair small, bases short and very narrow, the follow- 

 ing part minute (half shorter than the bases). 



•' Length 3 lines. 



" Hob. Fifteen miles west of Savaii, one of the Samoan Group, 

 March 5th, 1841."— Z)an«. 



4. Dairinia insequipes. (Plate L. fig. 6.) 



Daira ? insequipes, Dana, U. S. Explor. Exjyed. p. 993. pi. 68. f. 5. 



*' Cephalon subrotund. Pereion seven -jointed, first segment shortest. 

 Antennae small, five-jointed, upper side sparingly and very short 

 setulose. Gnathopoda quite small ; carpus of second pair sub- 

 triangular, inferior angle triangular, acutely serrate within and 

 without. First and second pairs of pereiopoda a little larger than 

 the gnathopoda, slender; thii-d iiair rather long; fourth much 

 shorter, bases broad elliptical, the remaining part but little longer 

 than the basos ; fifth pair small, the bases much smaller than 

 that of the preceding pair, and the following part shorter than the 

 basos. 



•' Length 2 lines. 



" Hah. Off" south end of Mindoro. January 24, 1842."— Z)a«f/. 



