SYSTEMATIC REPORT 67 



I can find no valid reason for separating B. kinkaidi Nouvel from B. californica Zimmer and, since 

 they were taken in approximately the same localities, I suggest that they are synonymous. 1 B. richardii 

 was founded on two immature females and has not since been recorded. In the type specimens the 

 distal portion of the telson was missing so that the form of the cleft could not be ascertained. B. van- 

 hoeffeni was founded on a single adult female and the distal end of both the antennal scales was missing. 

 It was, therefore, impossible to make a complete comparison between the two forms and such small 

 differences as they show can, in my opinion, be attributed to growth changes. 



The genus is thus reduced to twenty species which have already been described, in addition to the 

 five new species mentioned above. I have drawn up an artificial key to these species and hope that it 

 may help workers to identify them. 



Key to the species of the genus Boreomysis 



Spines arming the lateral margins of telson arranged in series; cleft with dilatation at its base. 1 



Spines arming lateral margins of telson sub-equal or in weak series; cleft without dilatation at base. 5 



(Carapace smooth. 2 



1 J Carapace covered with small tubercles. B. verrucosa Tattersall 



(Distal segments of 2nd thoracic endopod modified to form a sub-chela. 3 



Distal segments of 2nd thoracic endopod not sub-chelate; rostral plate narrow and produced into long acute 

 rostrum. B. rostrata Illig = B. inermis Hansen 



{Inner distal margin of propodus of 2nd thoracic endopod emarginate. 4 



Inner distal margin of propodus of 2nd thoracic endopod not emarginate but armed distally with two large 

 spines with the dactylus fitting down between them; rostral plate very short. B. bispinosa sp.n. 



Emargination of propodus of 2nd thoracic endopod armed proximally with one strong spine among a group 



of plumose setae; eyes small and downwardly directed. B. microps G. O. Sars 



Emargination of propodus of 2nd thoracic endopod marked proximally with a hump armed with plumose 

 setae but no spine; rostral plate well produced with distinct shoulders. B. tattersalli sp.n. 



(Distal segments of 2nd thoracic endopod sub-chelate. 6 



(Distal segments of 2nd thoracic endopod not sub-chelate. 7 



Emargination of 2nd thoracic endopod armed proximally with a group of plumose setae and one slender 



barbed spine; cornea occupying only half of distal end of eyestalk. B. semicaeca Hansen 



Emargination of 2nd thoracic endopod very deep with no spine at proximal end ; rostrum long and acute ; 

 lateral spines of telson sub-equal. B - incisa Nouvel 



Eyes without pigment or visual elements; eyestalks cup-shaped. 8 



Eyes normal with functioning visual elements. 9 



(Eyestalk cup with thin marginal rim (northern form). B. scyphops G. O. Sars 



(Eyestalk cup quadrangular with thick marginal rim (southern form). B. inermis (W.-Suhm) 



Anterior margin of carapace with upturned rim and no rostral projection; antennal peduncle four- 

 segmented; telson lobes with one very long spine at apex. B. insolita sp.n. 

 Anterior margin of carapace not produced; rounded with extremely small rostral projection. 10 

 .Anterior margin of carapace produced into well-developed rostral projection. 13 

 (Apex of antennal scale much longer than spine terminating outer margin; ocular papilla large; cornea small, 



not wider than eyestalk. B. vanhoeffeni Zimmer = B. richardii Nouvel 



Apex of antennal scale shorter, equal to, or only very slightly longer than spine terminating outer margin; 

 ocular papilla small or absent; cornea large and globular. IX 



1 Since writing the above I have heard from Dr Banner that he is withdrawing B. kinkaidi as a synonym of B. californica. 

 [O.S.T.] 



9-2 



10 



