CoE.— Nemerteans. 



PLATE 5. 



Carinomella lactea Coe. 



Fig. 45. Ventral side of anterior portion of body showing position of mouth 

 and proboscis pore. X 16. 



Fig. 46. Side view of anterior portion of body, showing dark band of differ- 

 entiated epithelium, with the lateral sense organ indicated as a 

 colorless spot near its posterior border. X 16. 



Fig. 47. Somewhat diagrammatic dorsal view of specimen cleared in cedar 

 oil after staining lightly. The contracted proboscis bulb {pb) 

 appears just behind the mouth. Anterior limit of differentiated 

 dark band shown at x. The position of the lateral sense organs 

 {Iso) and outline of the alimentary canal are shown. The thick- 

 ening of the inner circular muscle ceases at a, and the narrow 

 lumen of the stomach enlarges at the same region. The sexual 

 glands (sg) are here more regularly placed than is the case more 

 posteriorly. X 26. 



Fig. 48. Diagrammatic reconstruction of nephridial system. The fine nephri- 

 dial tubules which indent distal wall of lateral blood ve.s.sel (Iv), 

 constituting the so-called nephridial gland, extend both anterior 

 (a) and posterior to the origin of the main nephridial duct (nep), 

 which passes much farther posteriorly to open on dorso-lateral 

 surface of body by a smaller efferent duct (nd). 



Fig. 49. Median sagittal section through anterior portion of body, showing 

 rhynchodaeum (rh), attachment of proboscis (ap), proboscis bulb 

 {pb), mouth (m), esophagus (e), cephalic blood lacunae (bl), and 

 brain commissures. X40. 



