On the Lysianassa magellanica etc. 25 



This species is easily recognized by the following' characteristics. 

 The 1 st pair of feet have the 3 rd joint as long as or longer than half of 

 the 2 nd ; the claw is armed at the inner edge with a strong tooth; the edge 

 of the hand, to which the claw is attached is furnished with a row of ex- 

 tremely fine spines arranged like the teeth of a comb, within which are 

 scantily set bristles ; and last the 3 rd tail-segment has the lower back angle 

 but little drawn out, but acute. The processus accessorius of the mandibula 

 is particularly prominent, and on one side provided with teeth. 



In very young individuals the 3 rd joint of the 1 st pair of feet is shor- 

 ter than half of the second, and they closely approach the A. nanoides, 

 from which however they may be distinguished by the abovementioned pair 

 of feet beeing longer and slenderer, and by the fore and back borders of 

 the hands being somewhat curved but not convergent, as in the latter spe- 

 cies. The carpus of the 2 nd pair of feet is not quite double as long as 

 the hand. 



This species occurs on our west coast from Bohusliin to Finniar- 

 ken, and is extended northward to Greenland and southward to England. 



4. A. NANOIDKS, n. sp. 



It is probably this species that R. Bruzelius (1. c.) has described un- 

 der the name of Anonyx nanus Krdyer with a note of interrogation. In his 

 description he has omitted the minute denticle on the inner side of the claw 

 of the I s pah' of feet. 



Descr. Minor; longitudo circ. 5 — 6 millim. Corporis forma sat obesa, 

 tameii compressa, epimeris magnis, et pedibus brevibus, et unguibus pedum 

 trunci posteriorum arcuatis. Segmentum o-.tium eaudae angulis posterioribus 

 et inferioribus (fig. 34 a) recurvis sed minus acutis. 



Antennae superiores inferioribus paullulum breviores, segmentis 2:do et 

 3:o pedunculi brevissimis. Flagellum articulis 10, quorum primus maximus, 

 fere 3:tiae parti flagelli sequalis. Flagellum appendiculare articulo l:mo fla- 

 gelli longius, circ. finem articuli 5:ti assequens, articulis 6. Antennae infe- 

 riores articulis flagelli circ. 20. Maxillipedes laminis exterioribus ad 

 medium circiter articuli 3:tii palpi porrectis, oblongo-ovatis, apice obtuse 

 angulato, margine exteriore apicem propius eroso ibique seta minore, mar- 

 ginoque interiore noduloso, nodulis minimis et paucis. Laminae interiores 

 ad medium exterioruni extensae. 



Nova Acta Reg. Sue. Sc. Ops., Ill* Sine. 4 



