268 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE X. 

 Benhamia Bolavi Michaelsen, pacifica, var. nov. 



Fig. 68. The ventral sexual zone, showing the fossae, the prostate pores 

 with penial setae, and the oviduct pores in the center of XIV. 



Fig. 69. A spermatheca, rare form. 



Fig. 70. A spermatheca, common form. 



Fig. 71. Apex of the longer penial seta. 



Fig. 72. Shorter penial seta front view a; side views b and c. 



Fig. 73. Section through the junction of the calciferous diverticles with the 

 intestine. The section is tangential to the intestine. 

 Benhamia Bolavi Michaelsen, var. palmicola Eisen. 



Fig. 74. Section through calciferous diverticle. 



Benhamia papillata Eisen. 



Fig. 75. Section through calciferous diverticle. 



Benham,ia nana Eisen. 



Fig. 76. Section through calciferous diverticles. 



Benham,ia papillata Eisen, hawaiiensis, var. nov. 



Fig. 77. Nephridia in two succeeding somites, showing the outlines of the 

 ccelomic mantles. 



Fig. 78. A spermatheca. 



Fig. 79. Apex of larger penial seta. 



Benham,ia papillata Eisen. 



Fig. 80. Nephridia of two succeeding somites, showing outlines of the 

 coelomic mantles. 



Fig. 81. Spermatheca. 



Dichogaster Crawi, sp. nov. 



Fig. 82. A specimen natural size. 



Fig. 83. The three anterior somites and prostomium (dorsal view). The 

 very diminutive somite I is entirely hidden between prostomium 

 and somite II. It can be clearly demonstrated in sections only. 



Fig. 84. Anterior somites, ventral view. Genital region and the deltoid 

 arrangement of the setae. 



Fig. 85. Genital region, more magnified. The zone is sunk, but the two 

 central papillae project as high as the body- wall surrounding the 

 zone. 



Fig. 86. A more magnified view of one of the genital papillae, showing the 

 branched deep groove, in the upper end of which open the pros- 

 tate and sperm-ducts. 



Fig. 87. Two of the largest penial setae, from one sac. The largest seta is 

 more wavy at the apex and the spur is shorter. 



Fig. 88. One of the common setae, showing the general outline a; the 

 ornamented apex b. 



Fig. 89. A spermatheca, the diverticle pointed forwards. 



Fig. 90. Two somites on one side of the ventral ganglion, showing the 

 micro-nephridia arranged as four flaps. 



Fig. 91. Anterior somites (longitudinal section;; corrosive sublimate. Zeiss 

 AA-, Oc. 4; t. c, taste-cells in the epithelium. The small, round 

 dots at the base of the narrow epithelial cells represent light-cells 

 lips, inner circular lips, with clear sac-like cells. At the anterior 

 end of the lips are seen bunches of taste-cells. 



Fig. 92. Longitudinal section of the calciferous diverticles, parallel to the 

 surface of the intestine. The two anterior diverticles are seen to 

 be only folds of one sac, while the posterior diverticle is connected 

 with the former by a narrow ciliated duct, which also serves as 

 a duct for the anterior diverticular folds; d. c. d., duct of calciferous 

 diverticle. 



Fig. 93. Longitudinal section passing through the duct of the calciferous 

 diverticle, just cutting into the intestine; or., orifice of diverticles. 



Fig. 94. Longitudinal section of the body-wall in the genital somites XVI- 

 XVIII. Genital papilla in XVII, constructed from two sections. 



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