500 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



The pleou is somewhat geuiculated aud slightly compressed dorsally 

 at the third somite, bat uoue of the somites are cariuated. The telson 

 is a little shorter than the sixth somite, evenly rounded above, and 

 regularly tapered to a narrow truncated tip armed with six slender 

 spines, of which the sublateral pair are much larger than the lateral 

 and median. 



The eggs, iu the alcoholic specimens, are approximately 1.0 by CS'""^' 

 in longer aud shorter diameter. 



Many of the specimens, after long preservation in alcohol, show dark 

 bauds of pigment spots across the antennal scales, uropodal lamellae, 

 and somites of the pleou. 



This is the species to which I have referred as BytJiocaris, sp. indet, 

 iu Proc. National Mus., iii, p. 437, 1881, and Bull. Mus. Comp. Zool., x, 

 p. 55, 1882. 



Measurements in millimeters and hundredths of length of carapax. 



Stotioa 



87a 



878. 



Sex 



Length from front to tip of teUon .. 



Length of carapax 



Breadth of carapax 



Breadth of front 



Length of eye-stalk and eye 



<5reatest diameter of eye 



Length of antennal scale 



Breadth of antennal scale 



Lengtli of sixth somite of pleou 



Height of sixth somite of pleon 



Length of telson 



Length of inner lamella of uropod . . 

 ■Bre«ith of inner lamella of uropod . 

 Length of outer lamella of uropod. . 

 Breadth of outer lamella of nropod . 



25. 5 

 5.6 

 4.3 

 2.0 

 2.0 

 1.1 

 5.0 

 1.8 

 4.1 

 1.7 

 4.9 

 3.8 

 1.1 

 4.2 

 1.3 



Per 



c«nt. 

 =455 

 100 

 77 

 36 

 36 

 20 

 f^9 

 32 

 73 

 30 

 87 

 68 

 20 

 75 

 23 



Per 



Mm. cent. 

 25. 0=455 



5. & 

 4.2 

 1.9 

 1.9 

 1.1 

 4.6 

 1.7 

 4.0 

 1.8 

 5.0 

 3.8 

 1.1 

 4.3 

 1.4 



100 

 76 

 35 

 35 

 20 

 84 

 31 

 73 

 33 

 91 

 69 

 20 

 78 

 26 



Specimens ejcamined. 



'-3 



863 

 872 



874 

 878 



Locality. 

 N. lat. W. long. 



OFF MARTHA'8 VISETARD. 



40 05 00 



40 05 39 



40 00 00 



39 55 00 



70 23 00 



70 23 52 



70 57 00 



70 64 15 





Path. 

 65 

 86 



85 

 142 



Xature of bottom. 



Date. 



« 



63 I Fine sand, mud 



50J Sand, gravel, aheUs, 

 I sponges 



51 Soft mud 



52 Mud 



1880. 

 Sept 4 



Sept 4 

 Sept 13 

 Sept 13 



Specimens. 



I 



.2 



a 



d 9 



3 5 



2 

 1 

 2 6 



be 



^ 



