REVIEW THE SCIENTIFIC STUDY OF WORMS. 79 



Modified setae occur on segments n to 14; the head (prostomium) is 

 long and narrow, and the brain ganglion apparently circular in front 

 For convenience of reference I named it provisionally the curvi- 

 setose dichaste (Diduzta cunrisetosa) — a different name from 

 Diachaete. Now in Chaetogaster we have an instance of worms 

 with the dorsal sete missing, and Beddard reminds us (p. 306) that 

 one species (Ch. filiformis) has been figured by Schmarda with 

 1 setas upon every segment of the body. It comes from Curaca, in 

 South America ; I have examined a specimen from Valdivia.' It 

 will be seen that Dichoeta, though it has affinities here, differs from 

 every genus recorded by Beddard, and does not fall under any of 

 the groups arranged by him on page 8 in the table of setas. Indeed, 

 as the author remarks, our knowledge of the aquatic species has not 

 by any means kept pace with that relating to the terricolous forms, 

 and Eisen has predicted that when we come to the careful study of 

 the former we shall find that they number thousands of species. 

 In fact Eisen has just published a further memoir, in which he adds 

 a large number of new species, as well as some new genera, to 

 Beddard's list. When we turn to the descriptions of genera 

 and species in the monograph before us, a sense of bewilderment 

 at their number and variety comes over us, and the day will not be 

 long in dawning when a lifetime will have to be spent in the study 

 of w T hat is now an insignificant genus or group. Mr. Beddard's 

 work will remain for some time the main starting-point in the 

 direction of such researches. 



I may be allowed to point out one or two lapses of the pen, and 

 defects in arrangement. The Index is a little puzzling. It jumps 

 from j£olosoma to Anteus, then comes back to Allolobophora. 

 Lophochaeta is wrongly placed on page 760. Some portion of the 

 Explanation of Plates has been omitted by an oversight. Anachaeta 

 is given on page 8 as an example, in contradiction of the statements 

 on PP- 5> E *> that it has no setae- Chae togas ter should be substituted 

 for Anachaeta, I think in discussing the use of setae some reference 

 might be made to the tact that, at any rate in the Polychasta, they 

 serve as a protection, just as do the bristles of the Hedgehog and 

 Porcupine. No doubt the same end is also served by the capilliform 

 Sttae of the Tubificids and others among fresh-water annelids. It 

 would have greatly facilitated reference if we had been supplied with 

 an index to the subject-matter of the first part of the volume. As 

 it is we have no means of knowing where to turn for remarks on the 

 pores, glands, setae, ccelom, nephridia, and other important matters. 

 We could also wish that the very full and valuable bibliography, 

 including nearly 600 entries, had been made more complete by the 



>Urch 1896, 



