304 REPORT OP COMMISSIONER OF FISH AND FISHERIES. 



The ai'raugemeut of the families adopted, and to a certain extent their 

 aflinities, ai-e indicated in the subjoined table, in which, however, as 

 throughout the article, special reference is had to the representatives of 

 the order in New Euiiland waters, extraliuiital species, genera, and even 

 higher groups, Apseudes and the Serolids, for example, being disre- 

 garded. The arrangement will be seen to considerably resemble that 

 of Dr. Fritz Miiller. I have placed the Tanaidw at the other end of the 

 order, pai'tly, however, from the necessity of a lineal arrangement. 



SYNOPTICAL TABLE OP FAMILIES. 



I. Respiration pleonal ; legs not furnished with a chelate hand. 



1. Legs in seven pairs. 



a Antenuuhe small or rndin^entary; autenme longer, often mnch elongated. 

 t Uropods teruiinal, sometimes rmlimentary, rami mostly styliform. 

 Legsamhulatoryj autennnhe rudimentary ; respiration aerial. 



I. 0XISC1D.E, p. 305 

 Legs prehensile ; sexes very nnlike ; adult forms degenerate ; para- 

 sitic II. BOPYRID.*:, p. 311 



Legs ambulatory or prehensile; segments of pleon united ; antennas with a 



multiarticulate tlagellum III. Asellidje, p. 312 



Last three pairs of legs natatory; segments of pleon united; antenna} with 



a miiltiartioulate tlagellum IV. MUNNOPSlDiE, p. 328 



tt Uropods inferior, opereuliform. 



Legs prehensile or ambulatory, not ciliated V. Ipotkid^, p. 335 



First four pairs of legs ciliated ; last three pairs ambulatory. 



VI. AKCTURlDiE, p. 361 

 b Antennula? and antenuit snbequal; body not elongated. 

 t Uropods lateral, with one ramus obsolete or subrudimentary. 



Antennul;^ and antennse well developed; pleon of two segments ; uropods 



with one movable ramus VII. Si'HiEROMiDas, i>. 367 



Autenmihe and antennae short ; pleon of six segments ; outer ramus of uro- 

 pods small VIII. LlM^■OKllLvE, p. 371 



tt Uropods lateral, distinctly biramous; rami mostly lamellifonu. 



Mouth caruassial ; legs not ancoral; ant ennnhe exposed iu front ; pleopods 



ciliated IX. Cikolanid^, p. 376 



Mouth suctorial; first three pairs of legs ancoral; autenniihe exposed in 



fr«nt X. ^Egid^, p. 382 



Mouth suctorial ; legs all ancoral ; antennnhe concealed at base by the pro- 

 jecting front ; pleopods naked XL Cymothoid^, p. 390 



Antennnhe and antennae subeqnal, or antenuuhe much the largest in the ihales ; 

 body cylindrical, elongated. 

 t Uropods lateral and superior. 



Legs ambulatory or prehensile XII. ANTHUElD.i;, p. 396 



2. Legs in the adult iu six, apparently only five, pairs. 



Five pairs of legs ambulatory ; antenuula) and antennas subeqxial. 



XIII. GNATIIIIDJ5, p. 408 



II. Respiration cephalothoracic ; first pair of legs terminated by a cheljlte hand. 



Le^ ambulatory and prehensile ; head united with the first thoracic seg- 

 ment; antcuuular tlagellum single XIV. Tanaid^k, p. 413 



