550 PROCEEDINGS OF THE NATIONAL MUSEUM. v<n..xxiii. 



119. ASTACILLA GRANULATA ( G. O. Sars). 



Leachia granulata G. O. Sars, Arch. Math. Nat., II, 1877, p. 351 (251). 



Astadlla americana Harger, Am. Jour. Sci., XV, 1878, p. 374. 



Asiacilla granulata Harger, Proc. U. S. Nat. Mus., II, 1879, p. 161; Report 



U. S. Commissioner of Fish and Fisheries, 1880, Pt. 6, pp. 364— 3t)7, })ls. 



viii-ix, figs. 48-52. 



Hahhai. — Georges Bank; Banquereau; Miqnelon Island, south of 

 Newfoundland; also between Norwa}^ and Iceland. 

 Depth. — 7 to 250 fathoms. 



120. ASTACILLA CiECA Benedict. 

 7l.s<an7/rt c.Tra Benedict, Proc. Biol. Soc. Washington, XII, 1898, p. 51. 

 Hahitat.—hni. 38° 22' N., Long. 70° 17' 30" W. (South of Marthas 

 Vineyard.) 

 Bejjt/i.— 1,825 fathoms. 



IV. ASELLOTA or ASELLOIDEA. 



ANALYTICAL KEY TO THE FAMILIES OF ASELLOTA. 



a. Eyes generally present. First pair of legs prehensile or subcheliform. Last 

 three pairs of legs ambulatory, not natatory. 

 I). Three posterior segments of thorax not sharply marked off from the four an- 

 terior ones, and not smaller. Caudal segment large, shieldlike. Eyes, 

 when present, lateral or subdorsal, not placed on peduncle-like projections 

 of the head. Superior antennae issuing close together. Legs subequal in 

 length. 

 c. Lateral parts of head scarcely expanded. Eyes, when present, small, lateral. 

 Peduncle of inferior antennpe without small accessory appendage outside of 

 third joint. Legs ambulatory, except first pair, which are distinctly sub- 

 cheliform; legs with dactylus generally uni-unguiculate. First pair of ple- 

 opoda in female very small, not operculiform. Outer lamella of second 

 pair very large and incrusted, so as to form, together with corresponding 

 lamellre of the other side, a sort of operculum, covering the two succeeding 



pairs Family XIV. Asellid^ (p. 551). 



c^. Lateral parts of head lamellarly expanded. Eyes, when present, usually 

 subdorsal. Peduncle of inferior antennae generally with small accessory ap- 

 pendage outside of third joint. Legs ambulatory, except first pair, which 

 are sometimes prehensile; legs with dactylus generally bi- or tri-unguiculate. 

 First pair of pleopoda in female transformed into a single, large opercular 

 plate. Outer lamellae of two succeeding pairs narrow and confluent with 



basal part Family XV. Janirid.e (p. 553). 



¥. Three posterior segments of thorax, as a rule, sharply marked off from four 

 anterior ones, and much smaller. Caudal segment more or less vaulted 

 above, subpyriform. Eyes, when present, placed on the tips of lateral 

 peduncle-like projections of the head. Superior antennae placed widely 

 apart. First pair of legs much shorter than others. Succeeding pairs more 

 or less rapidly increasing in length Family XVI. Munnid^e (p. 556). 



a'. Eyes wanting. First pair of legs sul^prehensile. Last three pairs of legs n?,ta- 

 tory, with some of joints flattened and ciliated. First pair of legs shorter 

 than three following pairs. Second, third, and fourth pairs very elongate. 



Family XVII. Munnopsid^e (p. 557). 



