160 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



Historical review.— For the history of Ascaris delphini see page 162, Schueider 

 (1866, p. 44) originally described Ascaris lobulata with the followiug diagnosis: 

 C. Lippen ohne Zahnleiste mit Aurikeln UAd Zwisohenlippen. 



15. Ascaris lobulata ii. sp. rf und ? 40"". 



Rinne tief. Die Spitze des Eckzahns bildet einen rechten Winkel. Die Loben reiohen in die 

 Auriculae. Vulva? Schwanz des S leicht gekriiinmt, auf der Bauchseite glatt. 12 Papillen hinter 

 dem After, eine an uniegelmassiger Stelle mit conieh verlangerter Pulpa seitlich. 1, 2, 3 hinter 

 einander nahe an der Spitze, 4-12 unregelmassig zu 2- und 3 neben einander, vor dem After eine Reihe 

 Papillen. 



Delphinus gangeticus. Crassum. 



Fig. 90. 



Fig. 91. 



Fig. 92. 



Krabbe (1878, p. 47) examined specimens deposited in the museum of the Uni- 

 versity of Kopenhagen ; they were collected on the Galathea expedition of Professor 

 Reinhardt from the buccal cavity of dolphins of the Ganges in Hooghly Eiver near 

 Calcutta. The lips (fig. 91) resemble those of Ascaris osculata, but are more strongly 



built. 



Jagerskiold (1894, p. 461) examined specimens from the buccal of Platanista 

 gangetica, which he received from Levinsen, of the Kopenhagen Zoological Museum, 

 These may possibly have been the same specimens which Krabbe studied, but 

 Jagerskiold does not state so. He found the vulva 6'"'" from the head in a female 

 25min long. The excretory organ agrees with the same organ in A. spiculigera and 

 A. osculata; the posterior division of the oesophagus (flg, 92) is unusually short, and 

 possesses a caecum; the intestinal caecum is also present. 



