CHAETODERMA .TAPOXICA. 67 



The animal is a female, not perfectly matur(>, and the ducts leading into the 

 pericardium are accordingly small. The openings into the coelomoducts are 

 likewise minute, and the ciliated tube with which each connects is relatively long 

 and slender. The glandular division with which it unites is a comparatively 

 simple tube, at first directed forward until it reaches the level of the front end of 

 the heart whereupon it bends abruptly and makes its way to the opening into 

 the cloaca] chamber (Plate 28, fig. 10). 



The nervous system is in an excellent state of preservation and is clearly 

 defined, but a careful study has failed to disclose any noteworthy feature. It 

 may be mentioned that a subradular system exists similar in all respects to that 

 of C. aUenuala. 



Chaetoderma japonica, sp. nov. 



One specimen (Plate 3, fig. 7) was dredged off Honshu Island, Japan (Oi 

 Gawa, Sta. 3721) at a depth of 207-2.50 fathoms. The body is comparatively 

 slender, measuring 17 mm. in length by l.o mm. through the nietathorax and 

 1.5 mm. through the preabdomen. The co^n- is almost white with a slight 

 tinge of yellow. A slight incrustation, brick-retl in color covers the spines in 

 the cloacal region. The spines are of the usual type. 



The mouth opens through a distinct pore in tlie l^uccal plate (Plate 3, fig. 8) 

 which, like the neighboring section of the digestive tube, is abundantly supplied 

 with glands, small celled and more than connnonly compact. These continue, 

 for a considerable distance behind the radula, ajiparently unchanged in character 

 though in many cases closely applied against the bases of the buccal and pharyn- 

 geal epithelium. This first named organ with its supports and musculature is 

 typical, as may be seen in Plates 30, 31. As the major portion of the body was 

 not sectioned the union of liver and stomach has not been .seen; otherwise these 

 organs conform to the usual i)lan. The jinTcctal iiortion of the intestine is 

 lined with an exceptionally high epithelium so that the lumen is very small where 

 it is not distended with pellets of faecal matter consisting principally of tliatoms 

 and sponge spicules. 



The nervous system is not especially favorable for study and accordingly 

 only its more general features have been examined. In this respect it is tyiiical. 



The specimen is a female and the fully formed ova present the customary 

 appearance and are developed in a gland holding the usual position. The ducts 

 leading into the pericardium, are large and as in the case of the last named space, 

 and the gonoducts, are filled with eggs mostly disintegrated, due perhaps to 

 violent movements of the somatic nuisculature. The gonoducts open by rcla- 



