1,2 CAI.IKOUNIA ACAUEMY OK .SCIENCES. 



tlie spcniKliict.s ill i'lKi-iiicodrihis iilso ()|icii iiitu tlic Jitiiuni. lint the qiic.-ti(»ii that still 

 rt'iiiain.s to be .settlod is this. Is the atrium in Phu'iiicutlriliis a inodilieiJ bunsa copii- 

 latri.x, or is it simply the rtMnaius of deteriorated prostate. The absence of a penis 

 ill I'lmiiicodrilus makes the hitter alternative seem most probable. While in Ocne- 

 rodriliis the reduction of the prostate consi.sts in the lo.ss of one layer of glandular 

 cells in the iipieal part, this reduction has proceeded further in Pho'iiicodrilns, the 

 whole glandular apical part here being wanting. 



The j)rincipal differences between the genera Ocnerodrilus and I'hu-nicodrilus 

 are then as follows: 



Ocnerodrilus. A prostate of varying size is always present at tlie male pore. 

 This prostate consists of two parts, one glandular, lined by a single layer of cells, and 

 one mu.scular basal part. 



l'h(inicodr'dii.s. No prostate, only a slioil or rudimentary muscular atrium, in 

 the lower [lart of which opens the spermduct. 



Phoenicodrilus taste Eisen. 



Definition. Atrium rvxlimentary, muscular and bulbous, only about ticice as 

 thick as the spermducts. No ovisac. SpermalheG(.e covered ivith vmrty excrescences. 

 Arciform muscles in .vvii cornparatirelij fev\ 



This species, which I first described from the west coast of the Cape Kegion 

 of Baja California, has since been found by Messrs. Eisen and Yaslit in two widely 

 separated localities. Ft was found in great iiuniiiers at Miraflores, on the east side of 

 the Sierra of the Cape Kegion, some 30 miles north of San Jose del Cabo, together 

 with (Jcnenidrilus Beddardi, Sept., 1894. It was, however, quite unexpected to find 

 this species also common in garden soil at San Bias, the sea|)ort in the territory of 

 Tepic, several hundred miles south of the Cape Region peninsula. I can liiid no 

 differences in the anatomy, nor in the exterior of the specimens from these respective 

 localities. The small copulatory papilla in .somite xiv, lateral to the oviduct, is present 

 in all. So are the numerous muscles in the copulatory region around the male pore. 



Phoenicodrilus tepicensis ii. sp. 

 Figs. 155-100. 



Definition. Atrivm about tu<ice as long as the body wall, but hidden by arciform 

 muscles in somite xrii. A median ovisac tw xir/xiii. Spermatheae entirely smooth, 

 rvithout icarty excrescences. Arciform muscles in xvii very mtmerous. 



Habitat. Numerous specimens in and around the city of Tepic, territory of 

 Tepic, Mexico, 4000. In iii(>i>l >n\\ undiT logs, in gardens, etc. November, 1804. 

 Found together with Arn iilluidrilus I'asliti. Only few specimens were adult in 

 November. 



EXTKKIol; ( llAltACTEKS. 



/Size 4 cm. by U nnii. Niiiiibcr of somites 75. 

 Clitellum incomplete, comprising somites xiii-xix. 



