68 DISCOVERY REPORTS 



(Eyes extremely large; no ocular papilla; rostral projection nearly obsolete; propodus of 3rd-8th thoracic 

 endopods undivided. B. megalops G. O. Sars 



Eyes with large cornea somewhat flattened dorso-ventrally ; small ocular papilla; propodus of 3rd-8th 

 thoracic endopods two-segmented. I2 



Lateral margins of telson concave with narrowest part just proximal to base of cleft; small ocular papilla. 



B. atlantica Nouvel 



12 J 



13 



15 



[6 ■ 



17 



Lateral margins of telson almost straight with few spines; apical spines not longer than lateral ones; no 

 ocular papilla recorded. B. obtusata G. O. Sars 



Rostral projection tridentate. B. tridens G. O. Sars 



Lateral margins of rostral projection mostly convex but concave distally forming distinct shoulders. 14 



Rostral projection with lateral margins only slightly convex and without shoulders. 17 



Lateral spines of telson sub-equal with only a tendency to an arrangement in series; ocular papilla, when 



present, shorter than cornea. x 5 



14 J Lateral spines of telson arranged in more or less definite series; ocular papilla extending beyond anterior 

 [ margin of eyes. J ° 



Eyes large; no ocular papilla; rostrum long, acute, horizontal; scale acutely pointed with apex obsolete; 



lateral margins of telson almost straight. B. nobilis G. O. Sars 



Eyes small; cornea narrower than eyestalk; small ocular papilla; apex of scale slightly longer than terminal 



spine of outer margin; rostrum uptilted; lateral margins of telson somewhat concave. B. plebeja Hansen 



Rostrum long, extending forward almost to anterior margin of 1st segment of antennular peduncle; eyes 

 large; ocular papilla very long; telson cleft to more than i/4th of its length; lateral spines with only 

 a tendency to arrangement in series. B. illigi sp.n. = B. rostrata Illig (<J only) 



Rostrum only reaching i/4th of the length of the first segment of the antennular peduncle; apex of scale 

 slightly longer than spine terminating outer margin; eyes moderately large; papilla finger-like; telson 

 cleft to i/6th of its length with lateral spines arranged in series. 



B. californica Ortmann = B. media Hansen = B. kinkaidi Banner 



Cornea narrower than eyestalk; ocular papilla very long. 18 



Cornea equal to or wider than eyestalk; ocular papilla small or finger-like. 19 



Rostrum acute and very long, especially in ?, extending to anterior margin of eyes or beyond ; apex of scale 

 shorter than spine of outer margin; eyestalks very wide distally; lateral spines of telson sub-equal; cleft 

 1/3-5 of length of telson. B. acuminata sp.n. 



Rostrum extending half-way along eyestalks; apex of scale equal in length to terminal spine; eyestalks very 

 . wide distally; lateral spines of telson in series; cleft i/sth of length of telson. B. fragilis Hansen 



t Rostrum extending to anterior margin of eyes ; spines arming lateral margins of telson proximally in weak 

 19 I series but equal distally. 20 



I Rostrum extending only half-way along eyestalks. 2I 



I Apex of scale shorter than spine terminating outer margin; ocular papilla almost obsolete. 



B. arctica (Kroyer) = B. tregouboffi Bascesco 



j Apex of scale longer than spine terminating outer margin; ocular papilla small but well developed. 



\ B. brucei Tattersall 



(Apex of scale shorter than spine terminating outer margin; ocular papilla very small; lateral spines of telson 

 arranged in definite series. B. sibogae Hansen = B. spinifera Coifmann 



Apex of scale longer than spine terminating outer margin; ocular papilla long and finger-like; lateral 

 spines of telson almost equal. B. dubia Coifmann 



Boreomysis rostrata Illig, 1906 



1906a Boreomysis rostata Illig, p. 196, fig. 2; 1930, p. 414, figs. 22-35 (? only). 



1910 Boreomysis inermis Hansen, p. 26, pi. 2, figs. ^a-\c. 



1951 Boreomysis rostrata, W. M. Tattersall, p. 56, figs, wa b, iza-d, 13. 



21 



