REPORT ON THE SCHIZOPODA. 



173 



The following is a synopsis of the genera represented in the collection : — 



Number of 

 incubatory 



lamellae, 

 composing -| 

 marsupial 



pouch in 



female, 



seven 

 pairs. 

 Male 



greatly differing from female, having mandibular 

 palp and gnathopoda remarkably modified, 



differing from female in the usual manner, chiefly 

 as regards the structure of the caudal limbs, 



two 



pairs 



only, 

 with a 



rudi- \ 

 ment of 

 a third 



pair. 



Eyes 



,eniiiiial 



Legs 



imperfectly [ "''^J',"/'''°"°' '"'^' '^ '^'''""^ '"' 

 developed, I ' ' ' 



remarkably slender, filiform, without 

 any terminal claw, 



non-subdivided or only 

 bi-articulate, terminal 

 claw very strong. 



of the usual 



structure. 



Caudal 



limbs in 



male 



natatory. 



Propodal 



joint of 



legs 



sub- 

 divided 



into 

 three or 



more 

 articu- 

 lations. 



An- 

 tennal 



scale 



remarkably 

 small, 



lanceolate, se- 

 tose on both 

 edges, 



obliquely trun- 

 cate at apex, 

 outer edge 

 smooth, 



rudimentary as in female, 



Pelaloph thalm iis, Suhni. 

 Boreomysis, G. 0. Sars. 

 Amhhjops, G. 0. Sars. 

 Pseudomma, G. 0. Sars. 



Siridla, Dana. 

 Anchialus, Kroyer. 



Mijsldoims, G. 0. Sars. 



Euchcetomera, G .0. Sars. 

 Hetewmysis, Smith. 



Genus 1. Petalophthalmus, Willcmocs-Suhm, 1879. 

 Petaloplithahntis, Suhm, Trans. Linn. Soc. Lond., scr. 2, vol. i. 



Generic Characters. — Female exhibiting the usual Mysidau appearance ; male very 

 dissimilar, with mandibular palps prodigiously developed, and some of the limbs of the 

 trunk also remarkably modified. Eyes in l)oth sexes leaf-like, without any visual 

 elements or pigment. Antennular peduncle greatly elongate in male, and without the 

 usual hirsute lobe. Antennal scale lanceolate and setose on Ijoth edges. Gnathopoda in 

 male very strong, subcheliform. Marsupial pouch in female composed of seven pairs of 

 incubatory lamellae. Caudal limbs of male scarcely natatory, inner branch simple, naked, 

 styliform, outer non-articulate, slightly dilated in the middle, and having an oblique 

 series of delicate bristles. Telson with apex entire, not incised in the middle. Outer 

 plates of uropoda distinctly jointed at apex. 



Remarks. — The remarkable form on which the above characterised genus has been 

 based, exhibits, in the female, some affinity to the genus Boreomysis, G. 0. Sars, the 

 marsupial pouch being, as in that genus, composed of seven pairs of incubatory lamellaj, 

 and the structure of the legs somewhat similar. Nevertheless, the very striking appear- 



