DESCRIPTIONS OF GENERA AND SPECIES 443 



(12) Diporochaeta dubia (SPENCEE). 



Perichaeta dubia, SPENCER, loc. cit., p. 14. 



Definition. Length, 45 mm. ; number of segments, 100. Prostomium complete. Clitellum, 

 XIII-XVII. Setae, 12-24. Genital papillae paired XVII/XVIII- XIX/XX. Oesophageal 

 swellings in IX-XIV. Intestine legins in XVIII. Last heart in XII. Sperm-sacs in 

 IX, XII. Spermathecae in V-IX. Hab.S. Warragul, Victoria. 



(13) Diporochaeta walhallae (SPENCER). 

 Perichaeta walhallae, SPENCER, loc. cit., p. 15. 



Definition. Length, 25 mm. ; number of segments, 88. Clitellum XIV XVI. Setae, 20-24. 

 No genital papillae. Intestine begins in XV (?). Last heart in XII. Sperm-sacs in 

 XII. Spermathecae in V-IX. Hab. Walhalla, Victoria. 



FAMILY CRYPTODRILIDAE. 



DEFINITION. Terrestrial (sometimes aquatic) Oligochaeta, with eight setae per 

 segment. Clitellum variable in extent, occupying some or all of segments 

 XII-XXIII, usually complete anteriorly. Spermathecae, one to five pairs, 

 placed anteriorly, nearly always with one or two diverticula. Male pores on 

 segment XVII or XVIII, opening independently of, or into the distal non- 

 glandular part of, the spermiducal gland, which is either tubular or lobate, 

 always present. Penial setae generally present. Nephridia paired or diffuse. 



This family is the most extensive of any of the families of earthworms, excepting only 

 the Lumbricidae and Perichaetidae, and embraces more generic types, many of which are, 

 however, ill-defined. Previously to the last few years, when the only generic types known 

 were Disaster, Pontodrilus, Plutellus, and Typhaeus, the family, as well as the genera 

 were easy to be defined. The large number of new genera and species which have since 

 been described, particularly by FLETCHER and SPENCER in Australia, make it a very 

 difficult matter to separate the genera. 



I have already given reasons for dividing ROSA'S family ' Eudrilidae ' into 

 Cryptodrilidae and Eudrilidae. 



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