156 Eev. Canon A. M. Norman on British Mysidaj. 



fifth segment of pleon. Antennules with only two small 

 spines on outer margin of second joint, third joint having five 

 spine-like setse on inner margin. A7itenn(e with only one 

 seta on inner margin of the penultimate and last joint of 

 peduncle ; apex of scale extending considerably beyond the 

 spine of termination of outer margin. Telson longer than 

 preceding segment, with about ten spines on each margin. 

 Legs and uropods nearly as in G. sanctus. Length about 

 13 millim. 



" Maris appendices genitales subfusiformes, medio valde 

 incrassatse, setis modo 3 instructte. Pedes spurii ab iisdem 

 speciei antecedentis sat discrepantes. Imum par bene evo- 

 lutum structura fere ut in G. sanclo^ 2duni par vix natatorium, 

 ramis forma dissimili setis ciliatis carentibus, externo cylin- 

 drico, paulo flexuoso 8-articulato, articulis 4 ultimis extus 

 aculeo tenui et lanceolato armatis, interno paulo breviore, 

 valde flexuoso, sigmoideo, 6-articulato, articulo primo sat 

 magno et laminari, ultimis 3 tenuissimis, setis apicalibus 

 2 parvis ; tertium par parte basali apice oblique truncato, 

 angulo exteriore in processum securiformem producto, ramo 

 interno perbrevi, et rudimentari appendicem modo parvara 

 uniarticulatam formante, externo vero valde elongate, styli- 

 formi, dimidiam postabdominis longitudinem fere aquante, 

 in segmenta 4 diviso, 2 anterioribus elongatis, 2 posterioribus 

 dimidia parte brevioribus, aculeis apicalibus 2 brevibus ; paria 

 2 posteriora minima, parte basali brevi, subtriangularij ramo 

 externo modo 3-articulato setis paucis ornato." 



Hah. Off Rockall, ' Porcupine,' 1869 ; off Valeutia, Ireland, 

 1870 {A. M. N.). 



Distribution. Naples, 1887 (y^. M.N.) ; Goletta, Syracuse, 

 Naples, and Spezzia ((r. 0. Sars). 



Genus 3. Anchialus, G. O. Sars, 1876. 



Rostrum more or less produced. Antennal scale unusually 

 small, outer margin naked, terminating in a spine-point, 

 extremity oblique. Lahrum drawn out into a long point, which 

 is slightly serrated on the margins. Legs with distal portion 

 (tarsus) divided into several articulations, not unguiculate. 

 Marsupial pouch formed of four pairs of lamellae. First 

 pleopods in female one-jointed, wider at base, then cylindrical ; 

 remaining pleopods rudimentary. Telson very large, cleft at 

 the extremity, sides with very numerous ciliated spines. Inner 

 uropods having inner margin edged throughout with spines 

 of unequal length. Outer uropods one-jointed, outer margin 

 spined j all set^e of uropods very short. 



