Benham. — On New Species of Earthivorms. 281 



The penial chcetce are especially diagnostic. Each is a 

 long gently curved bristle practically smooth on its shaft, and 

 terminated in a blunt point, which is not upturned. 



The sperniatheca is globular, with a short wide duct, into 

 which opens a single tubular diverticulum, which invariably, 

 as far as my observations on several individuals go, is prae- 

 septal. 



P. lineatus, Hut ton. 



Hutton's original specimen was obtained at Queenstown, 

 on Lake Wakatipu, in Otago. I have been able to examine 

 other specimens, collected by Mr. Malcolm Thomson on Ben 

 Lomond, a mountain 5,747 ft. in height overlooking the town. 

 The differential characters are as follows :— 



The prostomium is tanylobic — i.e., its prolongation com- 

 pletely cuts through the 1st segment, as Captain Hutton 

 shows it in his fig. F (1876). 



The clitellum appears to be limited to segments 14 to 17, 

 and I have observed no copulatory tubercles ; but in both 

 of these characters I must for the present reserve judgment, 

 owing to lack of sufficient material. 



The dorsal vessel is single ; and the hearts are in 10, 11, 

 and 12. 



There is a small gizzard in segment 6, recognisable on dis- 

 section. 



The oesophageal gland is in segment 14, projecting slightly 

 into the 13th segment. 



There are only three pairs of sperm-sacs, in segments 

 9, 11, and 12. 



The penial chcetce are longer and more delicate than in 

 P. syivestris, and the tip is bent upwards and slightly ex- 

 cavated, so as to be spoon-shaped, though in side view 

 the tip is pointed. But, further, the shaft is marked by 

 numerous distinct but fine, interruptedly transverse, low 

 ridges, finely serrated. 



The sperniatheca is ovoid, with a short and comparatively 

 narrow duct, into which there open two short and somewhat 

 globular diverticula, the lower of which is praeseptal. One 

 of these diverticula — perhaps both — is lobed — i.e., its free 

 extremity is notched by one or two furrows. In the type 

 it is the lower which is thus notched ; in the Ben Lomond 

 specimen it is the upper one. 



These two characters — the penial chsetae and the sperma- 

 thecse — are very definite differential features of these closely 

 similar species. 



