41N ta(;k sK()osni:n<i 



lUtainmio I'h.d'h.) HoiHirks: - It is iiiipossibli' to di'i'uK' fur icrtaiii wlu'thcr lliis species is identical witli 



nniftfs aoiy. j,^^ (I'll.) lat'ripcs. tliou^li it does not spom impossible. As a prelimiiiiuv I ooiisidired it best 

 to describe it as a new species. The description ol Ph. laevipes that is I'ound in \\. von l)\ii\^ , 

 1!M)S, p. I'J is exceedinglv th'ticient , cleaih' chaw ii up witliout the aut bur ha\ini,M he necessary 

 knowleilge of the forms belonging to tiiis sub-gemis. 

 Ph. tnn-iprs = ln pa.ssing 1 mav point out tliat Pli. Incripc.'i is pr()l)al)ly a larva of the s])e(ies I'll, {'liar- 



"'"•'■ cvd. which is described by K. von D.M'A'i in tiie same treatise. l)AliA^ hinisell indicates the 

 possibility of these two forms being identical. Thus we read on p. 1.1 of tliis treatise: ,,En 

 general, les particuhnites de Torganism rajipellent beaucoup la I'hilomedes Charcoti, et, si la 

 structure des pattes vermiformes ne diflierait pas atitanl. on pourrait reunir les deux especcs, 

 v\rque toutes deux sont du meme endroit ,,(la cote de Tile Booth- Wandel, Terrc de Graham, 

 Antarctis)". encore que capturees a des dates differentes." According to this author the seventh 

 limb of Ph. laevipes is. unlike that of Ph. Charcoti, quite bare. This character to which Daday 

 attached such great importance that he derived the name of the species from it, can, of course, 

 not be regarded as any reason for not identifying these species. It is known tliat tliis absence 

 of armature on the seventh limb is a character of the larva; all species of this genus seem to 

 have a seventh limb of this type during the third larval stage. Other cliaracters as well, such 

 as the length of the shell, the number of f ureal claws, etc. support the idea that Ph. laevipes is 

 a larva of Ph. Charcoti in the third stage. 



The form dealt with by me here seems to differ from Ph. Charcoti, of which only the male 

 is described, in at least one character, namely the number of bristles on the seventh limb. Ph. 

 Charcoti is said to have only thirteen bristles, six on one side and seven on the otlier, while Ph. 

 (Ph.) rotunda is characterized, as we have seen above, by having a somewhat larger number 

 (23—26). 



RflaiiontoPh.fPh.) Another species to which Ph. rotunda is certainly very closely related is Ph. (Ph.) orbicu- 



oris ra y. ^^^^ — which, curiously enough and certainly incorrectly, is regarded by its author, G. S. Bhaia , 

 as a southern variety of Ph. (Ph.) globosa — ,,It is in all respects very similar to the well-known 

 European species P. Brenda'' (globosa) ..and may perhaps be fairly looked upon as a southern 

 variation of that form". G. S. Brady's description is unfortunately too incomplete to permit 

 of a certain identification. The relatively great length of the shell (2,5 mm.) and the fact that 

 ,,the surface of the shell is smooth and densely clothed with a villous coating of very short hairs" 

 (G. S. Brady, 1907, p. 4) seem, however, to argue against the identity of these forms. It is, 

 however, not impossible that they are identical, nor can it be considered impossible that G. W. 

 Mt'LLER was right when in 1912 he identified Ph. orbicularis with Ph. laevipes. 



Habitat: — South Georgia: S. A. E., Station 18, mouth of the West Fiord, Cumber- 

 land Bay, lat. 54" 15' S., long. 36" 25' W.; 22. IV. 1902; depth, 250 m.; loose clay; temperature 

 at the bottom + 1,2" C: 1 mature female; R. M. S. 136. S. A. E., Station 22, off May Bay, 

 lat. 540 17' S., long. 360 28' W. (type locality); 14. V. 1902; depth, 75 m.; clay with 

 scattered algae; temperature at the bottom -f lj5o C: 1 mature female; R. M. S., on slides, 

 S. A. E., Station 23, off the mouth of Moran Fiord, lat. 54" 23' S., long. 36o 26' W.; 16. V. 1902; 



