126 



THE FUR SEALS OP THE PRIBILOP ISLANDS. 



Fig. 28. 



0.48™"' from the tip, which is rounded aud bears a small styliform process embedded 

 in the cuticle; vulva three-sevenths of the length from anterior extremity. The ova 

 (fig. 28) are spherical, 52 /< in diameter, with roundish elevations. 



Von Linstow does not believe that Dujardin's (184;")) ".-Lsmr/.s- simplex Rud." (see 

 A. Dussumierii) is identical with the species he studied. 



Mouticelli (1889, pi). 69, 70) records A simplex from the stomach of 

 ^'Delphinus sp., of Porto La gunas {canaJi Patagonici);Ha,keii by Captain 

 Ohierchia in the voyage of the royal corvetta Vettor Pisani. His determi- 

 nation was made by comparing the specimens with the worms (N. 529, 829) 

 at the Vienna Museum determined by Diesing. It will thus be seen' that 

 this record depends entirely upon a determination made before Krabbe definitely 

 defined Ascaris simplex, and on this account calls for confirmation. 



Braun (1891, p. 110) and ,liigerski(ild ( 1891) are not accessible to us at present. 

 JagerskiiWd (1894, pp. 474-470) examined specimens of A. simplex from Beluga 

 leucas {^-Delphluapterns leucas), wbich be had obtained from Levinsen; he fouiul the 

 bursa as well developed in these as in A. (oujulinilvls ( ireplin 

 from Balaenoptera rostrata, and no longer doubts the identity of 

 the two forms. He describes the oesophagus (lig. 29) as com- 

 posed of two portions, an anterior longer portion, which increases 

 gradually in diameter, and a second shorter portion, which begins 

 with a swelling and then gradually decreases in size; no caeca 

 are present. The intestine is provided with several rows of 

 groups of elongate cells, each group having a, V shape, the ai)ex 

 directed caudad. The excretory organ is about one-third as long 

 as the animal. The vulva was 36""" from the anterior end in a 

 specimen 72""" long, and 70"'"' from the anterior end in one I.IO'"'" 

 long, these measurements thus differing considerably from those 

 given by von Linstow (1888). The vagina is long and narrow, 

 the uterus bicoru. Jilgerskiold inclines decidedly to the opinion 

 that A. KHkenthnlii Cobb, from liehuja leucas {-Belphmapterus 

 leucds) is identical Avith A. simplex as defined by Krabbe, but, 

 being unable to examine specimens of Cobb's species, he reseives 

 positive judgment. 



Stossich (1890, p. 17) adds no new facts to our knowledge of 

 A. simplex. He considers A. delphini and A. Dussumierii, as well 

 as A. amjuliralvis, as synonyms, but gives A. Kiilcenthalii as a 

 distinct species. 



Kegarding A. Kilkenthalii see p. 144. 



Since finishing this manuscript we have received fiorn Dr. Von Mavenzcller, of 



the Vienna Museum, a bottle of specimens with the label '' Ascaris simplex, Delp/iinns 



phocaena.^^ These worms we have redetermined as Ascaris typica (B. A. I., No. 2828). 



The label does not show whether these parasites were determined by Diesing or not. 



ft. Cuticular bauds <lo not <'xbil)it the liner transverse striae, Imt give a serrate aiipcaranco to the 

 margin of the worm when viewed under a microscope; oesophageal aud intestiual caeca 

 absent. 



Fi". 29. 



