62 TJ.S. NATIONAL MUSEUM BULLETIN 236 



the other genera that I feel confident that the female can readily be 

 recognized should it be discovered. 



The genus can be fitted into Lang's key in the following way: 



Key to the Genera of Canuellidae 



1. 1st thoracic somite fused to head to form cephalic somite 3 



Head and 1st thoracic somite separated by distinct suture, especially visible 



on sides 2 



2. Appendages on 3rd exopodal segment of leg 1 number 7. 



Canuella T. and A. Scott 

 Appendages on 3rd exopodal segment of leg 1 number 5 . Ifanella, new genus 



3. Exopodite of leg 1, 2-segmented Canuellopsis Lang 



Exopodite of leg 1, 3-segmented 4 



4. Rostral base swollen; exopodite of antenna 6-segmented 5 



Rostral base not swollen; exopodite of antenna 7-segmented. 



Canuellina Gurney 



5. Appendages on 3rd exopodal segment, leg 1, number 5; on 3rd segment, 



endopodite, 4 Brianola Monard 



Appendages on 3rd exopodal segment, leg 1, number 7; on 3rd segment, 

 endopodite, 6 Sunaristes Hesse 



Ifanella chacei, new species 



Figures 11&,c, 17, 18 



Material. — Loc. 81-A-3-d, 1 ad. cf , 0.81 mm. 



Description. — The following is based on the only specimen (male) 

 captured (holotype), which, after being figured, has been stained, 

 dissected, and the appendages mounted. 



Adult male, total length 0.81 mm.; greatest diameter 0.21 mm.; 

 length of longest furcal seta 0.38 mm. 



General shape of body cylindrical, not compressed laterally, or dorso- 

 ventrally, scarcely narrowing caudally when viewed in dorsal aspect 

 (fig. 116). Cephalo thorax oblong-ovate, without distinct separation 

 continuing in abdomen. Head and 1st thoracic somite more or less 

 separate; there is a fine of separation visible in the lateral parts of the 

 body (where it is as distinct as the line separating 1st and 2nd thoracic 

 somite), but this fine is only indicated very weakly on the back, where 

 the 1st and 2nd thoracic somites are very well separated. Cephalon 

 narrows slightly anteriorly into the broad rostral base; in lateral 

 view the back is smoothly rounded, in front separated by a distinct 

 groove from the big rostrum (fig. lie). Rostrum dorsally a big tri- 

 angular plate with rounded apex; in lateral aspect it appears to be 

 slightly curved, pointing forward and very slightly downward, reach- 

 ing halfway to 3rd antennular segment. 1st, 2nd, and 3rd thoracic 

 somites of nearly same length; 4th and 5th thoracic somites of 



