THE MOUNT DESERT REGION 221 



G. 0. Sars 



Centropagidae Centropagidae 



Diaptomidae 



Pseiidodiaptomidae 



Lucicutiidae j 



Temoridae I 



Metridiidae ' 



Heterorhabdidae 



Arietellidae | 



Candaciidae Candaciidae ] 



Pontellidae Pontellidae 



Parapontellidae 



Acartiidae j 



Tortanidae (part) \ 



Mormonillidae Tortanidae (part) 



Pseudocyclopidae Psendocyclopidae 



The Tortanidae (G. 0. Sars, 1902, p. 73) included the two 

 genera Tort anus and Mormonilla. The tirst is here replaced 

 in the family Pontellidae, the second makes up the family 

 Mormonillidae. 



Key to the families of Heterarthrandria \ 



1 First antenna composed of a few very j 



elongate segments Mormonillidae j 



First antenna normal 2 j 



2 Terminal spine of the outer ramus of the i 



second to fourth legs smooth Pseudocyclopidae ! 



These spines saw-edged 3 i 



3 Lobes wanting on the second maxilla. .Candaciidae j 

 Lobes present on the second maxilla ... 4 I 



4 Maxilliped strong, the proximal segment i 



usually elongate, never laterally ex- | 



panded Centropagidae j 



Maxilliped weak, the proximal segment 

 laterally expanded Pontellidae 



Centropagidae I 



Centropages Kroyer 

 C. TYPicus Kroyer. (G. 0. Sars, 1902, p. 75, pis. 49-51.) 

 A few specimens taken in surface tow at D 104. 



