8 



PROCEEDINGS OF THE NATIONAL MUSEUM 



The copulatory apparatus is shown in sagittal view in figure 3. 

 The general anatomy of the copulatory apparatus of the present new 

 subspecies bears a great resemblance to that of the Alaskan subspecies, 

 Phagocata nivea nivea (cf. my fig. 3 and Kenk, 1953, p. 167, fig. 21). 



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Figure 2. — General view of mature specimen of Phagocata nivea tahoena from whole mount: 



No. 459f. 



The genital pore, situated in about the middle of the postpharyngeal 

 region, leads immediately into a small cavity, the common antrum. 

 This cavity leads to the left and dorsally into the canal of the copula- 

 tory bursa or the well-developed vagina, and to the right and anteriorly 

 into the male antrum. The male antrum is wide anteriorly, tapering 

 toward the genital pore, and its outer wall is fined with a rather tall, 

 glandular epithelium. Below the epithelium there are two muscle 

 layers, one circular and the other longitudinal. The narrow posterior 

 part of the male antrum receives into its dorsal wall the common 

 ovovitelline duct. Terminal portions of the ovovitelline ducts and the 

 common ovovitelline duct are equipped with numerous eosinophilic 

 cement glands. 



The penis consists of two parts, a moderately large spherical bulb 

 embedded in the parenchyma and a free, well-developed papilla 

 projecting into the male antrum; the penis bulb is muscular. It contains 

 a single bulbar cavity (seminal vesicle) from which a wide canal con- 

 tinues to the tip of the penis papilla. Typically, the penis lumen ap- 

 pears to be wider in the bulb than it is in the papilla, but no distinct 

 ejaculatory duct is differentiated. The penis lumen is lined with an 

 epithelium of glandular structure, tapering in thickness posteriorly. 

 The penis bulb is pierced by numerous ducts of the penis glands, the 



