430 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



overlapping acetabulum. Prostate gland conspicuous, fan shaped, at base 

 of sinus sac. External prostatic vesicle lacking. Sinus sac thin vealled, 

 very broad, filling most of the intercecal space anterior to acetabulum, 

 tapering very little anteriorly and still less posteriorly, both ends broadly 

 rounded, 0.270 to 0.300 in length by 0.225 to 0.255 in width. Spherical, 

 internal, prostatic vesicle, near base of sinus sac. Genital sinus very M^ide; 

 its M^all thrown into peculiar longitudinal folds (fig. 118) ; when con- 

 tracted, almost as wide as long. Most of sinus sac filled with very thin- 

 walled, transparent cells. Anterior end of sinus may be protruded lobelike 

 from genital pore. 



Ovary smooth, ovoid, to the left, about midway between acetabulum 

 and base of ecsoma. Vitelline lobes short and thick, almost spherical, 

 each narrowed at its base ; group of 3 facing laterally ; group of 4 facing 

 ventrally. Uterus not extending beyond base of ceca, not entering ecsoma; 

 surrounded by gland cells opposite posterior half of acetabulum; metra- 

 term opposite anterior half of acetabulum, joining sinus sac just anterior 

 to prostatic vesicle. Eggs thin shelled, 15 to 19 by 10 to 12 /x. Excretory 

 vesicle sinuous, forking between testes just posterior to acetabulum, 

 branches uniting dorsal to pharynx. 



The name muraenae is for the host. 



Comparisons. The sharply defined, muscular, nonglandular presomat- 

 ic pit is different from such organ found in other species of the genus. 

 Other distinctive characters are the large size and great width of the 

 sinus sac and the peculiar longitudinal folds or rugae in the walls of the 

 sinus. The vitelline lobes are shorter than in L. synodi or L. microsto- 

 mum. 



Derogenes various (O. F. Midler, 1784) 



Hosts: Paralabrax humeralis (Cuv. and Val.) 



Cratinus agassizii Steindachner 

 Location: Stomach 



Locality: Tagus Cove, Albemarle Island, Galapagos 

 Number: One specimen in each of the above hosts 



These 2 new host records for this cosmopolitan trematode bring its 

 total known hosts to at least 59. Although the distribution of D. varicus 

 is wide, the species has not yet been reported from tropical waters except 

 at some depth. Manter (1934, p. 318) suggests that temperature is an 

 important factor in its distribution, since he found it rather common at 

 Tortugas at depths of 190 fathoms and more, but did not find it in 



