CIIiETOPODA OLTGOCHA5TA. 
449 
selata, pp. 57 & 05, Qiiarnero, mnrtcnsi^ pp. 00 & 05, Laventiika, russa, 
pp. 01 & 05, Ovalau, mauritiana, pp, 01 & 05, Mauritius, hrevicirj’is, pp. 01 
& 04, Indian Ocean ?, cirrata, p. 03, Brazil, nicoharica, p. 03, Nicobar, papU- 
losa, p, 04, Valparaiso : Grube, 1. c, 
Goninda echinidata, Grube, 1. c. p. 07, Desterro, Brazil. 
Melinna palmata, id. 1. c. p. 08, St. Malo. 
Notophyllum myriaphyllum, Sclimarda, 1. c. p. 308, fig. 205, Antilles. 
Ilesione proctochona^ id. 1. c, p. 307, fig. 204, Jamaica. 
AnLhostoma ramosum, id. 1. c. p. 300, fig. 202, Jamaica. 
Colohranchus tetraccus, id. 1. c. p. 300, fig. 203, Atlantic. 
Cluctopterus macropuSj id. 1. c. p. 302, fig. 259, New S. Wales. 
Siphonostoma antarcticum^ Baird, 1. c. p. 95, New Zealand. 
Clymene yrossa, Straits of Magellan, insignis, hab. — ? : id. 1. c. p. 95. 
Tcrehella macrohrachia, Sclimarda, 1. c. p. 356, fig. 256, hab. — ? 
Sahellaria bella, Desterro, Brazil, Chili, castelnaui, New Zealand, 
Icevispinis, Upolu : Grube, 1. c. pp. 09 & 70. 
Ereutho serrisetis^ Grube, 1. c. p. 09, St. Malo. 
Euchone rubella, Ehlers, SB. Soc. Erlang. 1871, p. 82, Spitsbergen. 
• onYciiophoua. 
Peripatus quitensis, sp. n., Schmarda, 1. c. p. 371, fig. 209, Quito, 
OLIGOCHiETA. 
E. Ray Lankester Outlines of some Observations on the 
Organization of Oligoclisetous Annelids, Ann. N. H. (4) vii. 
pp. 90-101, 173 & 174) divides the Oligochmta into Lumhricidm 
( = Terricolm) and Limicolae. The latter includes the Smnuridoi 
(with the Enchytrmdce as a subgroup) and the Naididan (di- 
visible into NaidiruB and Chcetogastrinoi) . Specimens are easily 
mounted and preserved by means of glycerine jelly. Tubifex 
rivulormn, D^Udekem, T. umbellifer, Kessler, and Limnodrilus 
udekemianus, Claparede (the last two new to Britain) , are com- 
mon in the Thames mud. The more interesting parts of their 
structure and anatomy are noticed, and tlie setae of Tubifex 
figured. There is a rudimentary web to the dorsal setae of the 
first ten fasciculate segments, and traces even as far as the 
fifteenth. This character is most obvious in young specimens, 
and is unique among the Oligochaeta. It is probably due to 
retention of formerly well-developed ancestral characters. Both 
sexes coexist in Tuhifex ; but one sex usually predominates over 
the other, and some specimens are 2 in the essential and d in 
the accessory organs of generation. After a certain period of 
activity, the special organs of both sexes are absorbed in the 
perivisceral fluid ; and it is probably an early stage of this pro- 
cess, during which large masses of ova are detached, which 
Ratzel has mistaken for dimorphism of the ovaries. The organ 
called by Claparede a seminal vesicle is probably a gland secre^ 
