34 T. V. HODGSON. 



endopoditc has a hroad hasc, a straiglit inner margin, the greater part of which is 

 covered with fine sctie. Tlie inner margin tapers to a rounded apex, whii-h is provided 

 with long plumose setJB. The cxopodite is a little longer, much more delicate, ovoid 

 in shape, fringed distally with long plumose setae. Where the exo- and eudopodites 

 do not overlap the endopodite is very stoutly built. 



The seconil pair, tlie endopodite, is .similar to that of the first, hut quite without 

 any thickening; tlie exopodite is very much smaller, ovoid, and the pluiud.se sctiu occur 

 throughout the outer margin as well as distally. The appendix iiiasciilina is a narrow 

 stru(;ture of almost uniform diameter ; it is slightly curved and enlarged near the 

 distal end. On the inner .side of this enlargement and on the outer side of the 

 rounded extremity are series of very minute, backwardly-directed spines ; it is longer 

 than the endopodite. The third pleopod is like the second, hut the inner margin of 

 the endopodite is slightly strengthened. 



The fourth pair has the exo- and endopodites subequal in size, heart-.shaped, with 

 a shallow notch near the apex ; they are thicker and more Heshy than the preceding ; 

 they carry no setae. Both eudo- and exopoditcs have an oblique fold in passing from 

 the ant«ro-exterior margin towards the postero-latcral margin. The fifth pleopod is 

 rather larger than the pi-eceding. The endopodite is more irregularly cordate and has 

 an olili(iue fold. The exopodite is larger and two-jointed, the second joint being about 

 one-fifth the length of the whole and terminates in a blunt but thickened point. 

 Another similar thickening occurs about the middle of its inner border and close to 

 it, and on the main joint is a further thickened knob. A ridge runs from this along 

 the inner border of the first joint for some distance and passes straight on inside a 

 lobe of the exopodite. 



A rather large number of specimens were taken at Cape Adare on February 24, 

 1904, from the root of a large laminariau Lesmiua yrandifoUa, taken in 17 fms. 



ANTARCTURUS. 



The genus Arcturus was estiiblished by Latrcillc in 1804, and since that time it 

 has received a very large number of species, chiefiy from the SouthQrn Seas. Now, 

 however, the genus is to be broken up. Dr. zur Strassen has begun the operation and 

 .separates the northern species which contain the type, from the tropiad and soutliern 

 forms on the ground that in the type species the mouth parts are concealed from a 

 lateral view, and that the dactyli of the anterior pcreiopoda are comparatively very 

 small. In the southern species the mouth parts arc distinctly visible from a lateral 

 aspect, and the dactyli of the anterior pcreiopoda are large. For these the genus 

 Antnrcturus is instituted, and this contains the greater number of species. It is 

 probable, however, that it is only a temporary delay in the further breaking up of the 

 (iriL'inal genus, and if this alteration is to be carried on, minor characters, such as the 



