122 THE APODOUS HOLOTHTJBIANS 



T^ENIOGYRUS AUSTRALIANUS. 



Chirodota australiana Stimpson, 1856, p. 386. 

 Tcsniogyrus australianus Semper, 1868, p. 23. 

 Sigmodota australiana Ostergren, 18986. 



LENGTH. 30-50 mm. 



COLOR. Yellowish 



DISTRIBUTION. Port Jackson, New South Wales (Stimpson). 



EEMARKS. This very interesting species, rediscovered in the collection of 

 the National Museum, is well worthy of the generic distinction, which Semper 

 accords it. Like Leptosynapta dolabrifera, it is known only from Port Jack- 

 son, where Stimpson ( '56) says it occurs under stones near low-water mark. 

 The wheel-papillse are conspicuous, but occur only in the dorsal interambulacra 

 and are most abundant anteriorly. The sigmoid bodies are also in papillae 

 which are very abundant all over the body, but are largest and most noticeable 

 dorsally. Each papilla contains six or eight sigmoid bodies. The calcareous 

 ring is very narrow, much as Dendy ('97) figures it for Trochodota dunedinen- 

 sis. The genital glands are distinctly branched. Each of the five specimens 

 at hand has only ten tentacles. 



T.ENIOGYRUS CONTORTUS. 



PLATE VII, PIGS. 8-13. 



Chirodota contorta Ludwig, 1874, p. 80. Calcareous particles, pi. vi, fig. 6. 



Sigmodota purpurea Studer, 1876, p. 454 (non Lesson). 



Chirodota purpurea Bell, 1881, p. 101. 



Chirodota studerii Theel, 1886a, p. 33. 



Chiridota contorta Ludwig, 18926; 18986, p. 73; pi. m, figs. 37-42. 



Sigmodota contorta Ostergren, 1898&. 



LENGTH. 20-45 mm. 



COLOR. Very variable, ranging in life from orange through various shades 

 of red and purple to brownish violet; tentacles lighter, white to orange-red; 

 alcoholic material varies from yellowish white or gray to brownish red or 

 violet. 



DISTRIBUTION. Reported from Port Gallant, Punta Arenas, the Elizabeth 

 Islands, and stations in Strait of Magellan (Theel, Bell, Ludwig) ; Canal de 

 Washington (R. Perrier) ; eastern coast of Patagonia (Lampert, Ludwig) ; 

 Navarin Island, south of Tierra del Fuego (Ludwig) ; between Patagonia and 

 Falkland Islands (Theel) ; South Georgia (Lampert) ; Marion Island (Theel) ; 

 Kerguelen Island (Studer, Theel); near Madura Island, D. E. I., 82 m. (Slui- 

 ter). Apparently ranging from Kerguelen to the Strait of Magellan, across the 

 southern Indian and Atlantic Oceans. 



REMARKS. This interesting species has had a peculiar history, which is 

 admirably told by Ludwig ('98&), who also gives a very readable account of 

 the morphology and development. It is found in sand and mud near low-water 



