266 REPORT 1868. 



Arter (Videnskabs Selsk. Forhandl. for 1863), p. 2. Some young TJiysa- 

 nopodce were taken in the surface-net at the Out Skerries in 1861 ; hut 

 only one specimen is sufficiently developed to enable me to feel confident 

 that it has acquired the characters of the adult, and that one being a 

 male, which is not separately described by Sars, I feel some doubt as to 

 the identification, more especially as the young females differ in some 

 respects (which may be the result of age) from Sars's description. 



Mysis flexuosa (Huller)=Jfysis chamceleon, Bell, Brit. Crust, p. 336. Com- 

 mon in rock-pools. 



inermis, Rathke, Beitr. zur Fauna Norw. Nov. Act. Cses.-Leop. xx. 



p. 20; Lilljeborg, Ofvers. af Yet. Akad. Forhandl. 1852, p. 3; Frey u. 

 Leuckart, Beitrage zur Kenntniss, Wirbellos. Thiere, p. 160 ; G. 0. Sars, 

 Beretning (1863) Zool. Eeise i Christiania (1864), p. 16, = Mysis 

 cornuta, Naturbistorisk Tidsskrift, Tredie Esekke, vol. i. (1861) p. *26, 

 pi. i. fig. 3, a-g ; Goes, Crust. Decap. Podoph. Suecia?, p. 14. 



Antennal scale oblong, 4-5 times as long as broad, not half as long- 

 again as peduncle of upper antennae, about twice as long as the eye ; 

 apex very obliquely truncate, a spine at the external angle ; outer mar- 

 gin smooth. Hostrum distinctly produced into a triangular spine of 

 moderate length. Eye-stalks ornamented with dendritic pigment mark- 

 ings. Pereiopods with the propodos 4-articulate; nail well formed. Tel- 

 son closely resembling that of M. flexuosa, the cleft slightly deeper and 

 narrower ; 16-18 spines on each side, greatest distance between the last 

 and penultimate spine. Fourth abdominal foot in male less slender and 

 more evenly rounded throughout its length than that of M. flexuosa, to 

 which, in its general character, it closely approaches ; antepenultimate 

 joint not having any angular projection at its extremity; its seta fully 

 half as long as penultimate joint, which does not exceed the last joint 

 in length. 



Distinguished from M. flexuosa chiefly by its large and acuter ros- 

 trum, and its shorter antennal scale. Rock-pools, Shetland, scarce; 

 also Cullercoats, Northumberland (A. M. IS".), and Banff (Mr. Edward). 



spiritus, Norman, Ann. Nat. Hist. Dec. 1860, pi. viii. fig. 1 ; Trans. 



Tyneside Nat. Field Club, vol. iv. p. 329, pi. xvii. fig. 1 ; G. 0. Sars, 

 Beretning (1865) Zoologisk Eeise ved Kysterne af Christianias og Chris- 

 tiansands Stifter, 1866, p. 19. 5-8 miles off Balta, 40-50 fathoms, 

 1867. 



The following are important characteristics of this species, to distin- 

 guish it from the next : Antennal scale not widening from base to the 

 spine on external margin, that spine (in both sexes) at about three- 

 fifths of the distance from the base to the extremity. Eyes on long 

 stalks, which project beyond sides of carapace. Inner margin of inner 

 uropods with a dense crowded row of unequal-sized spines, so closely 

 packed as to touch each other at their bases. Male having the sexual 

 lobe of superior antenna? much shorter than the peduncle ; the fourth 

 foot of pleon with the first three joints subequal in length, and the last 

 joint subequal to the fourth. 



ornata 7 G. 0. Sars, Beretning (1863) Zoologisk Eeise i Christiania- 



stift. 1864, p. 18. 



Eyes short, scarcely reaching beyond the sides of the carapace, and 

 thick, widening at the cornea, which is somewhat kidney-shaped. Su- 

 perior antennae with a stout peduncle, which is shorter than the pedun- 

 cle of the inferior antennx ; fiagella longer than the pereion. Inferior 



