172 CALIFORNIA ACADEMY OF SCIENCES. 



the sperraducts in Phoenicodrilus also open into the atrium. But the question that still 

 remains to be settled is this. Is the atrium in Phoenicodrilus a modified bursa copu- 

 latrix, or is it simply the remains of deteriorated prostate. The absence of a penis 

 in Ph(jenicodrilus makes the latter alternative seem most probable. While in Ocne- 

 rodrilus the reductiou of the prostate consists in the loss of one layer of glandular 

 cells in the apical part, this reduction has proceeded further in Phoenicodrilus, the 

 whole glandular apical part here being wanting. 



The principal differences between the genera (3cnerodrilus and Phu3nicodrilus 

 are then as follows: 



Ooierodrilus. A prostate of varying size is always present at the male pore. 

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

 one muscular basal part. 



Phi/ridcodrilns. No prostate, only a short or rudimentary muscular atrium, in 

 the lower part of which opens the spermduct. 



Phoenicodrilus taste Eisen. 



Definition. Atrium rudimentary, muscular and bulbous, only about tu:ice as 

 thick as the spermducts. No ovisac. Spermaihecre covered unth warty excrescences. 

 Arciform muscles in xvii comparatively few. 



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

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

 separated localities. It was found in great numbers at Miraflores, on the east side of 

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

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

 this species also common in garden soil at San Bias, the seaport in the territory of 

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

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

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

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



Phcenicodrilus tepicensis n. sp. 

 Figs. 155-160. 



Definition. Atrium about twice as long as the body wall, but hidden by arciform 

 muscles in somite xvii. A median ovisac in xiv/xiii. Spermathecre entirely smooth, 

 ivithout warty excrescences. Arciform muscles in xvii very numerous. 



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

 Tepic, Mexico, 4000. In moist soil under logs, in gardens, etc. November, 1894. 

 Found together with Acanthodrihis Vasliti. Only few specimens were adult in 

 November. 



EXTEEIOK CHARACTERS. 



Size 4 cm. by 1^ mm. Number of somites 75. 

 Clitellum incomplete, comprising somites xiii-xix. 



