339] NORTH AMERICAN ASPIDOGASTRIDAE—STUXKARD 59 



tine of the larger marine Crustacea. Cunningham described it from the 

 Norwegian lobster, Nephrops, and Nickerson (1895) reported it from the 

 American lobster, Homarus americanus. 



V. Cotylogaster Monticelli 1892. Type species, C. michaelis Mon- 

 ticelli. 



Adhesive disc with three rows of alveoli, marginal organs present, 

 mouth terminal, oral sucker present, two testes. 



Two species have been described ; C. michaelis occurs in the intestine 

 of Cantharus vulgar us, a European fish, and C. occidentalis Nickerson 

 1899 is parasitic in the intestine of Aplodinotus grunniens of North 

 America. 



VI. Lophotaspis Looss 1902. Type species, L. vallei (Stossich) 

 1899. 



Adhesive organ with four rows of alveoli, marginal organs present at 

 all the intersections of the ridges of the adhesive disc, cirrus absent. 



Loos in 1901 reported L. adhaerens as belonging to a new genus of the 

 Aspidogastridae, but was not aware that Stossich two years before had 

 described the same form as Aspidogaster vallei. Looss later (1902) de- 

 scribed and figured the form under the name of Lophotaspis vallei. In the 

 same paper he compared A. macdonaldi with L. vallei and placed the 

 former species in the genus Lophotaspis. This trematode was reported 

 but not named by Macdonald in 1878, and named by Monticelli (1892) 

 as a species of Aspidogaster. Nickerson (1902) declared it to be an as- 

 pidogastrid, but different from all other known species, and predicted that 

 a new genus would have to be erected for it when its structure was better 

 known. Macdonald reported one hundred eighty extensile structures, 

 like the tentacles of a snail, occurring at the margins and intersections 

 of the ridges of the adhesive disc. Nothing is known of the internal 

 structure. Looss in placing the form in the genus Lophotaspis stated : 

 "Mit ihrer tentakeltragenden Bauchscheibe bildet die Art aber ganz 

 zweifellos einen fremden Eindringling in der Gattung Aspidogaster, da 

 dessen typischen Art jedenfalls solche Tentakel nicht besitzt. Gerade 

 diesen auffallended Character aber teilt sie mit Lophotaspis; bin ich 

 geneigt, A. macdonaldi Monticelli, trotzdem bei ihm die Genitaloffnung 

 weiter riickwarts liegt als bei Lophotaspis vallei, aus dem genus Aspido- 

 gaster herauszunehmen and zu Lophotaspis zu stellen." 



