BY E. J. GODDARD. 785 



Unlike that of A. notabilis^ the ciliated region of the digestive 

 tube is restricted apparently to the pharyngeal portion, The 

 <?ells of the intestinal epithelium differ from those of the gullet in 

 being much flatter, and, further, the epithelium itself is less 

 folded. In sections, also, the presence of the plexus-like arrange- 

 ment of bloodvessels on the wall of the intestine is another 

 distinguishing feature between these two regions. 



In the oesophagus are found great numbers of large uninucleate 

 masses, fusiform and vase-shaped, produced into a long flagellate 

 thread. Similar masses are to be found in the ccelome in the 

 region of the middle portion of the oesophagus, and a few examples 

 were noticed as far back as segment xii. These masses I have 

 identified as a Dicystid Gregarinidaceous Sporozoon, and in every 

 probability a member of the genus Stylorhynchus. All the 

 individuals noticed conformed to the spermatozoon type. No 

 traces of Sporozoa were to be found in this species in the mass of 

 developing spermatozoa, but I noted in that mass, in A. notabilis, 

 pyriform masses representing the psorosperms of a Myxosporidian. 



Ccelome. — The septa are extremely thin and indistinct, so much 

 so that, in certain regions, one has to rely on the ventral nerve- 

 ganglia in fixing the position and limits of organs in the study of 

 longitudinal sections. 



Nephridia. — Pregenital nephridia occur in segments vii., viii., 

 ix., and x. They are extensive structures, occupying a great 

 part of the ccelomic space. No nephridial structures are present 

 in segments xi., xii., and xiii. The first pair of postgenital 

 nephridia occurs in segment xiv. The arrangement of the pre- 

 genital nephridia is similar to that of species of Phreodrilus, those 

 of each side being united to form a continuous tube extending 

 from segments vii. to x. The extreme tenuity of these organs in 

 the present species renders the tracing of the same very difficult, 

 and I was unable to detect either pore or funnel. The arrange- 

 ment of pregenital nephridia in segments vii.-x., resembles that 

 of Phreodrilus Kerguelenensis. 



Blood-system. — I have but few notes on the blood-system in 

 this species, owing to the imperfect manner in which one can 



