DESCRIPTIONS OF GENERA AND SPECIES 273 



Grube particularly mentions the absence of uncinate setae in the dorsal bundles 

 of this worm, -which is one of its chief peculiarities, and enabled it to be identified 

 later. The worm secretes a thick slimy coating in which a quantity of Bacteria and 

 other foreign bodies exist, and which project here and there as papiUiform masses. 

 The anatomy has beei^ carefully worked out, and fully illustrated by Randolph (2). 



(2) Embolocephalus plicatus, Randolph. 



E. plicatus, Randolph, loc. cit. p. 147. 



Deflnition. Length 40 mm. ; number of segments 50. Two rings of sense pajpillae on each 

 segment equally far away from septa. Dorsal setae with uncinate setae among them. 

 Glitellum X-XII. Hah. — Lake of Ziirich. 



There appears to be in this species no extensile proboscis such as exists in the 

 last ; it is not quite clear whether this proboscis is merely the extruded pharjnix 

 or buccal cavity, or whether it is a peculiar structure. The layer secreted by the 

 worm is thinner in this species than in the last. There is no albumen gland, and 

 there are uncinate setae in the dorsal bundles ; the retractility of the head exists, but 

 the segments are not withdrawn as they are in the last species, but are simply closed 

 up in each other like the rings of a concertina. Figures and a fuller description of 

 the species are to be found in Randolph's paper upon the anatomy of this and the 

 last species. 



Appendix to Tubificidae. 

 Genus Phreodrilus, Beddaed. 



Depinition. Setae of two kinds, the dorsal capilliform, the ventral sigmoid ; testes 



in X, XI, fused to form one pair. Spermiduoal gland opening on to XII, 



sperm-duct much coiled, provided with an appendix of considerable length; 



spermathecae in XIII, long and coiled. 



This genus I place near the Tubificidae for the reasons stated above (p. 327). It 



contains at present only one species, which is found in subterranean wells in New 



Zealand. This was described by myself a few years ago. The characters of the setae 



at once distinguish the genus from any other genus of Tubificidae ; the dorsal setae 



N n 



