128 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



Oenerodrilus laeuum Beddard, Oenerodrilus \dJi\x\3cai'Beddard. 



panamaensis, var. nov. 



Dorsal Pores 



begin X/XI. begin at least VI/VII. 



Clitellum 



1/2 XV-1/2 XXII. 1/2 XIII-1/2 XXVI. 



Sacculated Intestine 



commences in XIII. commences in XII. 



Sperm-duct 



not wider at the pore. slightly wider at the pore. 



Prostates 



extremely long and folded, extending not so long, extending only through 

 through 16 somites. 6-7 somites. ' 



Lymphocytes. 



No crenate cells. Crenate cells. 



Nematocytes. No nematocytes. ( ? ) 



( All after Beddard.) 



Detailed Description. 



Septa. — The septum farthest anterior is IV/V and is very 

 narrow. There are five specially thickened septa. 

 Septal formula : — 



V/VI, VI/VII, VII/VIII, VIII/IX, IX/X. 

 The three central septa are of about equal size and some- 

 what thicker than the ventral body-wall in their somites. 



Septal Glands. — Septal glands are found in somites V, 

 VI, VII, VIII and IX. Those in V are very large, much 

 larger than the suprapharyngeal glands in IV, and about as 

 wide as the muscular part of the pharynx. The glandular 

 mass in V is principally dorsal, ventrally it is very narrow 

 and thin. The septal glands in VI-IX are exceedingly 

 diminutive and cannot be made out by dissection; they are 

 imbedded in lymphatic tissue and amongst agglomerations 

 of lymph-cells; they are confined entirely to the region 

 nearest the intestinal wall and are nowhere as thick as the 

 septa. 



