j. murray on gastrotricha. 223 



Head Five-lobed. 



C. acanthophorus, arquatus, eno?"mis, gracilis, longispinosus, 

 maximus, octonarius, persetosus, ploenensis, similis, simrothi, 

 spinulosus, squammatus, succinclus, tenuis, uncinus, zelinkai. 



All Bristles with Supplementary Points (Barbs). 

 C. chuni, erinaceus, hystrix, schultzei, similis, spinifer. 



Some Bristles Barbed. 



C. acanthophorus, enormis, heterochaetus, longispinosus, macro- 

 chaetus, octonarius, persetosus, spinulosus, zelinkai. All the 

 others are supposed to have simple unbranchecl bristles. 



Having Series of Larger Thicker Bristles. 



C. acanthodes, acanthophorus, bogdanovii, brevispinosus, dubius, 

 enormis, heterochaetus, longispinosus, macrochaetus, octonarius, 

 ornatus, ploenensis, persetosus, similis, spinifer, spinulosus, suc- 

 cinctus, tenuis, uncinus, zelinkai. 



Posterior Bristles Progressively Longer (exclusive of 

 the larger bristles above noted). 



C. arquatus, chuni, entzii, erinaceus, hystrix, larus, macro- 

 chaetus, ornatus, pusillus, schultzei, similis, tenuis, zelinkai. 



Bristles equal or not Noticeably Longer Posteriorly. 



C. brevispfinosus, dubius, formosus, gracilis, heterochaetus, 

 jamaicense, linquaeformis, marinus, maximus, serraticaudus, sim- 

 rothi, slackiae, squammatus, tabulatus. 



Notes on Some Species I have Seen. 



I have in some of my faunistic lists noted Chaetonotus larus 

 and Ichthydium podura, but these records have the same value 

 as nearly all such records i.e. none. 



At various times I have made studies of species which I could 

 not identify with the assistance of the literature at my disposal. 

 After reviewing nearly all the literature, and taking all tha 



