REPORT ON THE CRUSTACEA MACRTJRA. 



Division TEICHOBRANCHIATA. 



The Trichobranchiata may convenient])' be divided into two well-defined groups, one 

 containing those genera in which the most typical characteristics of the order arc 

 persistent, the other containing those that depart from them more or less distinctly, both 

 as to the character and arrangement of the branchiae as well as in possessing some 

 variation in the plan of the external structure and development. The former of these 

 may readily be designated by the term Normalia, being those of the most typical 

 condition, and the latter by that of Aberraxtia, or those that depart more or less 

 distinctly from the perfect character. 



Group ABERRANTIA, 



Group. 



ABERRANTIA. ■ 



Family. 



galath.eid.s. 



Pylochelid^. 



Thai.assixid.e. 



Cau.iaxassiii.i:. 

 Axim.*:. 



TlIAUMASTOCHELID-E. 



I 



Galathea. 

 Munida. 

 /Eglea. 

 Grimothea. 



( Cheiroplatea. 



Pohltttncltehx. 



( Pylocheles. 

 TliaJassina. 



Oallianassa. 



< '/<■ ramus. 



Scoliosis. 



Tripxa. 



Calliadina. 



Gebia. 



{ Axiun. 

 ■' Paraxius. 

 ( Eicon axius. 



I Thaumastochel.es. 

 J Calliaxus. 

 [ Caloearis. 



Jirephalos. 

 Zoea. 



Zoea '.' 



Megalopa, 



i 



Cephalon having the carapace short and compressed, with little or no rostrum. 

 Pereion having the posterior somite articulated with the preceding. Pleon having the 

 somites long, and not overlapping each other ; coxal plates but feebly developed, 

 with the post-inferior angles generally rounded. Ophthalmopoda small ; antennae 

 having the peduncles long. Pereiopoda more or less chelate, first pair longest, posterior 

 pair having a tendency to separate from the preceding, and directed backwards. 

 Pleopoda long, biramose, variable. Ehipidura strong, powerful, variable. 



