12 \V. A. IIERDMAN. 



Alimentary Canal long, with tlie iiitestinnl loop coutinued unusually far forwards. 

 Stomach surrounded by conspicuous glandular wBca (figs. 12 and 13). Anus with a 

 smooth, slightly thickened everted rim (fig. 12). Rectum loaded with diatomaceous ooze. 



Gonads a yellow ."yiusiige-shapod ma.ss ou each side, about 10 mm. in length, and 

 2 to 3 mm. in breadth, with a duct at the anterior end directed towards the 

 cloaca (fig. 13). 



I have pleasure in naming this new species in honour of Mr. T. V. Hodgson, who 

 showed both energy and ingenuity in his methods of collecting quantities of marine 

 animals, of nianv groups, from under the ice-sheet at the Winter Quarters of the 

 E.xpedition in McMurdo Bay. 



On trying to find the position of this species in its genus by means of the 

 dichotomising table in my " Revised Classification"*! find that its characters bring 

 it alongside M. vsepi/ormis of N.W. European seas, and M. palunculata from the 

 Antarctic. It agrees with M. csepiformis in being apparently unatt-ached, but that 

 species has only been found in the northern hemisphere and is of globular shape. 

 The present species has some resemblance to Mohjula nuucivia, described by Sluiter 

 from Dr. Charcot's Antarctic expedition (lie IJooth Wandel, He Anvers, 30-40 metres). 

 It also recalls my own M. peduiicidata from the 'Challenger' collection, found to the 

 South of Kerguelen Island at a depth of 150 fathoms ; and I notice that Sluiter states 

 that his species may possibly be the same as my M. pedanculata. There is no doulit 

 that all three are closely related forms, but I believe that, with our present knowledge, 

 they had better be treated as distinct species. The easier course would no doubt l)e 

 to say that these forms probably all belong to the one species, but so long as any 

 distinguishing features can be pointed out, such a statement would be an erroneous 

 identification. The more scientific course is surely to define such difiereuces as we can, 

 and leave it to our successors to dispose of these if they are able. We place before 

 them the evidence for three species, which possibly they, with fuller knowledge, may 

 be able to unite. 



From the ' Challenger ' M. pedunculata the ' Discovery ' specimen diti'ers in 

 external appearance, in .shape, in having the atrial aperture terminal, in the consistency 

 and thickness of the test, in the number of bars in the branchial sac, and in the position 

 of the dorsal tubercle ; there are also minor differences in almost all organs. Sluiter 

 has given the points in which his species difi'ers from M. pedunculata ; and I am add 

 that the present species differs from M. maxima in the shape of the body (although the 

 relative position of the apertures is the same in both), in the number of bars between 

 the branchial folds, and in the tentacles. 



• Journ. Linn. Soc, Zool., xxiii., p. 508. It is not always possible to identify species absolutely by such 

 tubles. They were not put forward for such a purpose (sec footnote on p. C59). They sen-e, however, to 

 indicate the position in the genus, after wliic-h the origi»ul descriptions should be consulted. 



