ART. 13 TEEMATODE PARASITES OF MARINE MAMMALS PRICE 17 



1896; D. {Dicrocoelium) tursionis (Marchi, 1873) Parona, 1896, p. 

 162. 



Description. — Synthesium: Body whitish, 20 mm long by 1.5 mm 

 wide, flattened ; cuticle spiny. Suckers equal in size, 800/i in diam- 

 eter; acetabulum situated 3 mm to 4 mm caudad of oral sucker. 

 Prepharynx 1 mm long ; pharynx 720/* long by 300/x wide ; intestinal 

 ceca as in BrachycJadiuvi { = Campula)., according to Odhner (1926). 

 Genital aperture preacetabular ; cirrus pouch long and tubular, and 

 containing the seminal vesicle, a long slender pars prostatica, and 

 cirrus (cirrus as in Orthosplanchnus., according to Odhner). Testes 

 as in Lecltliodesmus^ according to Odhner; anterior testis with five 

 lobes and posterior with six lobes, situated in posterior third of body, 

 according to Poirier. Ovary small, almost spherical, pretesticular, 

 and situated near the equator of body ; Mehlis's gland a little larger 

 than ovary. Vitellaria well developed and consisting of small grape- 

 like clusters of follicles ; they extend from a short distance cephalad 

 of ovary to the posterior end of body. Uterus sinuous ; vagina as in 

 Ortlios'planchnus. Eggs oval, 56|U, long by 33/* wide, with thickening 

 at posterior pole. 



Host. — Delphlnus tursio {^vohahly^Tur slops truncatus). 



Location. — Intestine. 



Distribution. — Europe. 



Remarhs. — This description is taken largely from that given by 

 Poirier (1886) for Distomum, longisshnuvi. The description given 

 by Marchi (1873) for D. tursionis is very incomplete and the figure 

 accompanying it is very sketchy. Parona (1896) restudied speci- 

 mens from Marchi's original material and pointed out that D. tur- 

 sionis Marchi and D. longissirawm Poirier were identical, but added 

 nothing to the original descriptions. Odhner (1926) reported that 

 this species had the digestive tract of Brachycladiuvi {^ C ampula) ., 

 the lobed testes of Lecithodesmus., and the characteristic copulatory 

 organs (charakterischen Endapparate der Geschlechtswege) of Or- 

 tJiosplanchnus., and suggested that it might be included in the latter 

 genus. Kecently Stunkard and Alvey (1930) proposed the genus 

 Synthesium for this species. The writer is in accord with this action, 

 since the inclusion of this species in the genus Ortliosplanchnus., 

 or in any of the related genera, would necessitate extensive revision 

 of the diagnoses of these groups; this is regarded as inadvisable 

 until more species have been described. 



HADWENIUS, new genus 



Generic diagnosis. — Campulinae : Body very long and slender, 



cylindrical, suckers close together; oral sucker slightly larger than 



acetabulum. Cuticle of anterior part of body spiny. Intestinal ceca 



without diverticula. Excretory vesicle tubular, extending anteriorly 



118893—32 2 



