( 18 ) 



Pig. 6. A highly magnified view of a segment of tlie preceding virgin uterus of 

 Orcella, and where the absence of utricular glands is still more apparent : 

 c, connective tissue, submucous and free epithelial mucous layers, where- 

 in the fibrous tissue, fusiform corpuscles, and capillaries are well shown ; 

 m., muscular and fibrovascular layers ; s., serous coat. 



„ 7. A piece in vertical section of the wall of the left cavity of the virgin uterus 

 of Orcella, and also demonstrating that no utricular glands are here 

 present : /., free mucous folds. 



„ 8. A view of portion of the gravid uterus of Flatanista close to the bare spots 

 and exhibiting in profusion the convolutions of utricular glands. 



„ 9. A horizontal section of the vagina of the gravid P. gangetica seen under an 

 inch object lens. It illustrates the somewhat stellate appearance of the 

 here deeply situate mucous glands, described in the text. 



„ 10. Specimen exhibiting a vertical section of the wall of the gravid horn of the 

 uterus of Orcella hrevirostris, enlarged about 4 times natural size. 

 It demonstrates the villous folded nature of the mucous surface, and in 

 the loose areolar tissue serpentine portions of many of the utricular 

 glands, and towards the lower muscular side the cut orifice of a large 

 blood-vessel. 



„ 11. A highly magnified representation of portion of the above vertical section of 

 the gravid horn of 0. brevirostris : c. I. denotes the crypt layer ; gl., the 

 glandular area, and at t. the transverse section of a utricular gland. The 

 epithilium lining the glands themselves is characteristically obvious. 



„ 12. This corresponds to one of the 4 dark stellate spots of fig. 9 from the vagina 

 of a gravid female I^latanista, but highly magnified. The figure is from 

 a horizontal section, as in fig. 9, and shows how the branches radiate from 

 the central receptacle. 



PLATE XXXIX. 



Fig. 1. Side view of an adult male skull of Flatanista gangetica, reduced \ 

 natural size. 



„ 2. The female skull of an adult P. gangetica drawn to same scale : md., mandi- 

 ble; mx., superior maxillary; cr., its crest; pmx., premaxillary ; /., fron- 

 tal ; ]3., parietal ; sq., squamosal ; 0., zygomatic process of squamosal ; 

 0., orbit. 



„ 3. A lateral view of the spinal column of Flatanista from the atlas to last 

 lumbar vertebra: c, cervical; d, dorsal; Z., lumbar region. 



„ 4. The remainder of the same spine : cd., caudal vertebrae. 



5. Outer view of the sternum and costal cartilages of an adult specimen of 

 Flatanista : p., prsesternum ; a., angle ; n., notch ; /., facet for articulation 

 of second rib ; m., mesosternum ; z., ziphosternum ; 3 third and 4 fourth 

 rib cartilages. 



